/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:41:28,787 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:41:28,790 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:41:28,818 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:41:28,818 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:41:28,819 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:41:28,821 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:41:28,823 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:41:28,824 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:41:28,825 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:41:28,826 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:41:28,827 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:41:28,828 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:41:28,829 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:41:28,830 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:41:28,831 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:41:28,831 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:41:28,832 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:41:28,834 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:41:28,836 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:41:28,838 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:41:28,839 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:41:28,841 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:41:28,842 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:41:28,844 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:41:28,852 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:41:28,853 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:41:28,854 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:41:28,854 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:41:28,877 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:41:28,877 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:41:28,880 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:41:28,881 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:41:28,881 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:41:28,881 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:41:28,881 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:41:28,882 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:41:28,882 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:41:28,882 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:41:28,882 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:41:28,882 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:41:28,883 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:41:28,883 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:41:28,883 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:41:28,883 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:41:28,883 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:41:28,884 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:41:28,884 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:41:28,884 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:41:28,884 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:41:28,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:28,885 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:41:28,885 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:41:28,885 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:41:28,885 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:41:28,885 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:41:28,886 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:41:28,886 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:41:28,886 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:41:29,198 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:41:29,211 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:41:29,214 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:41:29,216 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:41:29,216 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:41:29,217 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-08-21 20:41:29,284 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d5652c236/8900e9a1bf5c4a238af5185ebd49eb52/FLAG1eee68c05 [2020-08-21 20:41:29,718 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:41:29,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-08-21 20:41:29,726 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d5652c236/8900e9a1bf5c4a238af5185ebd49eb52/FLAG1eee68c05 [2020-08-21 20:41:30,123 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d5652c236/8900e9a1bf5c4a238af5185ebd49eb52 [2020-08-21 20:41:30,131 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:41:30,132 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:41:30,133 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:30,134 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:41:30,137 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:41:30,138 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,141 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34f77297 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30, skipping insertion in model container [2020-08-21 20:41:30,141 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,148 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:41:30,163 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:41:30,323 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:30,327 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:41:30,341 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:30,352 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:41:30,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30 WrapperNode [2020-08-21 20:41:30,353 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:30,354 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:41:30,354 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:41:30,354 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:41:30,363 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,364 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,368 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,369 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,463 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,464 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... [2020-08-21 20:41:30,465 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:41:30,466 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:41:30,466 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:41:30,466 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:41:30,467 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 20:41:30,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:41:30,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:41:30,531 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:41:30,531 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:41:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:41:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:41:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:41:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:41:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:41:30,697 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:41:30,697 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 20:41:30,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:30 BoogieIcfgContainer [2020-08-21 20:41:30,701 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:41:30,702 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:41:30,702 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:41:30,705 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:41:30,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:41:30" (1/3) ... [2020-08-21 20:41:30,706 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@361b15a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:30, skipping insertion in model container [2020-08-21 20:41:30,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:30" (2/3) ... [2020-08-21 20:41:30,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@361b15a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:30, skipping insertion in model container [2020-08-21 20:41:30,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:30" (3/3) ... [2020-08-21 20:41:30,709 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-2.c [2020-08-21 20:41:30,719 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:41:30,726 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:41:30,741 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:41:30,764 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:41:30,764 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:41:30,764 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:41:30,765 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:41:30,765 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:41:30,765 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:41:30,765 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:41:30,765 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:41:30,779 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 20:41:30,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 20:41:30,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,785 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,785 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 20:41:30,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723877493] [2020-08-21 20:41:30,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,143 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-08-21 20:41:31,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723877493] [2020-08-21 20:41:31,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:31,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:41:31,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710003618] [2020-08-21 20:41:31,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:41:31,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:41:31,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:31,191 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 20:41:31,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,218 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 20:41:31,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:41:31,220 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 20:41:31,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,227 INFO L225 Difference]: With dead ends: 29 [2020-08-21 20:41:31,227 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 20:41:31,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:31,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 20:41:31,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 20:41:31,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 20:41:31,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 20:41:31,261 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 20:41:31,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,261 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 20:41:31,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:41:31,261 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 20:41:31,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 20:41:31,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,262 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:41:31,263 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,263 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 20:41:31,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91597463] [2020-08-21 20:41:31,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91597463] [2020-08-21 20:41:31,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 20:41:31,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069728024] [2020-08-21 20:41:31,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:41:31,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:41:31,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:41:31,370 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 20:41:31,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,395 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 20:41:31,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:41:31,396 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 20:41:31,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,397 INFO L225 Difference]: With dead ends: 18 [2020-08-21 20:41:31,397 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 20:41:31,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:41:31,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 20:41:31,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 20:41:31,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 20:41:31,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 20:41:31,403 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 20:41:31,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,404 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 20:41:31,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:41:31,404 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 20:41:31,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 20:41:31,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,405 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:41:31,405 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 20:41:31,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330079493] [2020-08-21 20:41:31,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,512 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330079493] [2020-08-21 20:41:31,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:41:31,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180687125] [2020-08-21 20:41:31,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:41:31,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:41:31,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:31,515 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 20:41:31,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,539 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 20:41:31,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:41:31,540 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 20:41:31,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,541 INFO L225 Difference]: With dead ends: 19 [2020-08-21 20:41:31,541 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 20:41:31,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:31,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 20:41:31,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 20:41:31,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 20:41:31,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 20:41:31,547 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 20:41:31,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,548 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 20:41:31,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:41:31,548 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 20:41:31,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 20:41:31,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,549 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:41:31,550 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 20:41:31,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343609464] [2020-08-21 20:41:31,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,664 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343609464] [2020-08-21 20:41:31,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:41:31,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511809337] [2020-08-21 20:41:31,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:41:31,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:41:31,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:41:31,667 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 20:41:31,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,693 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 20:41:31,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:41:31,694 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 20:41:31,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,695 INFO L225 Difference]: With dead ends: 20 [2020-08-21 20:41:31,695 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 20:41:31,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:41:31,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 20:41:31,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 20:41:31,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 20:41:31,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 20:41:31,702 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 20:41:31,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,702 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 20:41:31,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:41:31,702 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 20:41:31,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 20:41:31,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,703 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:41:31,704 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 20:41:31,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445978290] [2020-08-21 20:41:31,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,825 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445978290] [2020-08-21 20:41:31,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:41:31,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025485113] [2020-08-21 20:41:31,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:41:31,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:41:31,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:41:31,828 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 20:41:31,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,871 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 20:41:31,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:41:31,872 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 20:41:31,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,873 INFO L225 Difference]: With dead ends: 21 [2020-08-21 20:41:31,873 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 20:41:31,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:41:31,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 20:41:31,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 20:41:31,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 20:41:31,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 20:41:31,880 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 20:41:31,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,880 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 20:41:31,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:41:31,881 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 20:41:31,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 20:41:31,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,882 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:41:31,882 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 20:41:31,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956867664] [2020-08-21 20:41:31,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:32,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,043 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:32,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956867664] [2020-08-21 20:41:32,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:32,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:41:32,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754053143] [2020-08-21 20:41:32,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:41:32,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:32,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:41:32,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:32,046 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 20:41:32,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:32,093 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 20:41:32,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:41:32,094 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 20:41:32,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:32,095 INFO L225 Difference]: With dead ends: 22 [2020-08-21 20:41:32,095 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 20:41:32,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:32,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 20:41:32,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 20:41:32,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 20:41:32,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 20:41:32,101 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 20:41:32,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:32,102 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 20:41:32,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:41:32,102 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 20:41:32,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 20:41:32,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:32,103 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:32,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:41:32,103 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:32,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:32,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 20:41:32,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:32,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286394180] [2020-08-21 20:41:32,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:32,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:32,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,415 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:32,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286394180] [2020-08-21 20:41:32,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:32,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:41:32,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011638303] [2020-08-21 20:41:32,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:41:32,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:32,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:41:32,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:41:32,418 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 12 states. [2020-08-21 20:41:32,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:32,502 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-08-21 20:41:32,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:41:32,502 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2020-08-21 20:41:32,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:32,502 INFO L225 Difference]: With dead ends: 21 [2020-08-21 20:41:32,502 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 20:41:32,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:41:32,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 20:41:32,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 20:41:32,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 20:41:32,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 20:41:32,504 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 16 [2020-08-21 20:41:32,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:32,505 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 20:41:32,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:41:32,505 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 20:41:32,505 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 20:41:32,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:41:32,508 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 20:41:32,612 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 20:41:32,612 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 20:41:32,612 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 20:41:32,612 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 20:41:32,613 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 20:41:32,613 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 20:41:32,613 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 10 20) the Hoare annotation is: true [2020-08-21 20:41:32,613 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 10 20) no Hoare annotation was computed. [2020-08-21 20:41:32,613 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 10 20) no Hoare annotation was computed. [2020-08-21 20:41:32,614 INFO L264 CegarLoopResult]: At program point L14-2(lines 14 17) the Hoare annotation is: (let ((.cse1 (div main_~x~0 4294967296))) (or (let ((.cse0 (* 4294967296 .cse1))) (and (< (+ .cse0 5) main_~x~0) (<= main_~x~0 (+ .cse0 6)) (<= 0 .cse1))) (and (<= main_~x~0 5) (<= 5 main_~x~0)) (and (< 0 (+ .cse1 1)) (<= main_~x~0 4)))) [2020-08-21 20:41:32,614 INFO L264 CegarLoopResult]: At program point L14-3(lines 14 17) the Hoare annotation is: (let ((.cse1 (div main_~x~0 4294967296))) (let ((.cse0 (* 4294967296 .cse1))) (and (< (+ .cse0 5) main_~x~0) (<= main_~x~0 (+ .cse0 6)) (<= 0 .cse1)))) [2020-08-21 20:41:32,614 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-21 20:41:32,614 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-21 20:41:32,614 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-21 20:41:32,615 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-21 20:41:32,615 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-21 20:41:32,615 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-21 20:41:32,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 08:41:32 BoogieIcfgContainer [2020-08-21 20:41:32,634 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 20:41:32,636 INFO L168 Benchmark]: Toolchain (without parser) took 2503.87 ms. Allocated memory was 148.9 MB in the beginning and 231.7 MB in the end (delta: 82.8 MB). Free memory was 103.9 MB in the beginning and 136.6 MB in the end (delta: -32.8 MB). Peak memory consumption was 50.1 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:32,637 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 148.9 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 20:41:32,638 INFO L168 Benchmark]: CACSL2BoogieTranslator took 219.94 ms. Allocated memory is still 148.9 MB. Free memory was 103.7 MB in the beginning and 94.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:32,639 INFO L168 Benchmark]: Boogie Preprocessor took 111.97 ms. Allocated memory was 148.9 MB in the beginning and 204.5 MB in the end (delta: 55.6 MB). Free memory was 94.4 MB in the beginning and 183.6 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:32,640 INFO L168 Benchmark]: RCFGBuilder took 234.99 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 172.3 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:32,641 INFO L168 Benchmark]: TraceAbstraction took 1932.38 ms. Allocated memory was 204.5 MB in the beginning and 231.7 MB in the end (delta: 27.3 MB). Free memory was 171.6 MB in the beginning and 136.6 MB in the end (delta: 35.0 MB). Peak memory consumption was 62.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:32,645 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 148.9 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 219.94 ms. Allocated memory is still 148.9 MB. Free memory was 103.7 MB in the beginning and 94.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.97 ms. Allocated memory was 148.9 MB in the beginning and 204.5 MB in the end (delta: 55.6 MB). Free memory was 94.4 MB in the beginning and 183.6 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 234.99 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 172.3 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1932.38 ms. Allocated memory was 204.5 MB in the beginning and 231.7 MB in the end (delta: 27.3 MB). Free memory was 171.6 MB in the beginning and 136.6 MB in the end (delta: 35.0 MB). Peak memory consumption was 62.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: (((4294967296 * (x / 4294967296) + 5 < x && x <= 4294967296 * (x / 4294967296) + 6) && 0 <= x / 4294967296) || (x <= 5 && 5 <= x)) || (0 < x / 4294967296 + 1 && x <= 4) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1.7s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 72 SDtfs, 2 SDslu, 212 SDs, 0 SdLazy, 174 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 60 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 14 PreInvPairs, 22 NumberOfFragments, 72 HoareAnnotationTreeSize, 14 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 59 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 84 ConstructedInterpolants, 0 QuantifiedInterpolants, 4045 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/56 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...