/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 -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 0.1.25-5644d1e-m [2020-08-18 16:24:17,854 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:24:17,856 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:24:17,879 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:24:17,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:24:17,881 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:24:17,882 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:24:17,884 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:24:17,886 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:24:17,886 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:24:17,887 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:24:17,888 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:24:17,889 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:24:17,890 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:24:17,891 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:24:17,892 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:24:17,893 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:24:17,893 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:24:17,895 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:24:17,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:24:17,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:24:17,900 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:24:17,901 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:24:17,902 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:24:17,904 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 16:24:17,904 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 16:24:17,904 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 16:24:17,905 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 16:24:17,906 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 16:24:17,907 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-18 16:24:17,911 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:24:17,912 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:24:17,913 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:24:17,914 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 [2020-08-18 16:24:17,937 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:24:17,937 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:24:17,938 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:24:17,939 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:24:17,939 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:24:17,939 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:24:17,939 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:24:17,940 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:24:17,940 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:24:17,940 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:24:17,940 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:24:17,940 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:24:17,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:24:17,941 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:24:17,941 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:24:17,941 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:24:17,941 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:24:17,941 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:24:17,942 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:24:17,942 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:24:17,942 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:24:17,942 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:17,942 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:24:17,943 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:24:17,943 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:24:17,943 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:24:17,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:24:17,943 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:24:17,944 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:24:17,944 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 [2020-08-18 16:24:18,285 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:24:18,306 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:24:18,310 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:24:18,314 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:24:18,314 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:24:18,315 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-08-18 16:24:18,379 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/32f138a4c/a650274e6ee8481ea83c08e3afab86db/FLAG048efcc0b [2020-08-18 16:24:18,821 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:24:18,822 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-08-18 16:24:18,827 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/32f138a4c/a650274e6ee8481ea83c08e3afab86db/FLAG048efcc0b [2020-08-18 16:24:19,247 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/32f138a4c/a650274e6ee8481ea83c08e3afab86db [2020-08-18 16:24:19,257 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:24:19,259 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:24:19,262 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:19,262 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:24:19,266 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:24:19,267 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,270 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@729acd32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19, skipping insertion in model container [2020-08-18 16:24:19,271 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,279 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:24:19,298 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:24:19,475 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:19,480 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:24:19,496 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:19,511 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:24:19,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19 WrapperNode [2020-08-18 16:24:19,512 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:19,513 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:24:19,513 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:24:19,513 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:24:19,528 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,529 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,534 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,535 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,609 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,614 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,615 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (1/1) ... [2020-08-18 16:24:19,617 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:24:19,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:24:19,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:24:19,617 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:24:19,618 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (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 [2020-08-18 16:24:19,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:24:19,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:24:19,684 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:24:19,684 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:24:19,684 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:24:19,684 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:24:19,684 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:24:19,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:24:19,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:24:19,869 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:24:19,869 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 16:24:19,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:19 BoogieIcfgContainer [2020-08-18 16:24:19,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:24:19,874 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:24:19,875 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:24:19,878 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:24:19,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:24:19" (1/3) ... [2020-08-18 16:24:19,879 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d71a76e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:19, skipping insertion in model container [2020-08-18 16:24:19,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:19" (2/3) ... [2020-08-18 16:24:19,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d71a76e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:19, skipping insertion in model container [2020-08-18 16:24:19,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:19" (3/3) ... [2020-08-18 16:24:19,882 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-2.c [2020-08-18 16:24:19,892 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:24:19,900 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:24:19,916 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:24:19,939 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:24:19,940 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:24:19,940 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:24:19,940 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:24:19,940 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:24:19,940 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:24:19,941 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:24:19,941 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:24:19,960 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 16:24:19,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 16:24:19,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,967 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,968 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 16:24:19,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712275233] [2020-08-18 16:24:19,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712275233] [2020-08-18 16:24:20,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:20,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 16:24:20,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169722048] [2020-08-18 16:24:20,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 16:24:20,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 16:24:20,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:20,232 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 16:24:20,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,269 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 16:24:20,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:24:20,272 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 16:24:20,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,281 INFO L225 Difference]: With dead ends: 29 [2020-08-18 16:24:20,281 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 16:24:20,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:20,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 16:24:20,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 16:24:20,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 16:24:20,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 16:24:20,328 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 16:24:20,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,329 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 16:24:20,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 16:24:20,330 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 16:24:20,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 16:24:20,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,331 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:24:20,331 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 16:24:20,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776984655] [2020-08-18 16:24:20,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776984655] [2020-08-18 16:24:20,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 16:24:20,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013584723] [2020-08-18 16:24:20,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:24:20,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:24:20,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:20,558 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 16:24:20,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,589 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 16:24:20,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:24:20,592 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 16:24:20,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,593 INFO L225 Difference]: With dead ends: 18 [2020-08-18 16:24:20,593 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 16:24:20,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:20,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 16:24:20,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 16:24:20,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 16:24:20,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 16:24:20,600 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 16:24:20,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,601 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 16:24:20,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:24:20,601 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 16:24:20,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 16:24:20,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,602 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:24:20,603 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 16:24:20,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990800282] [2020-08-18 16:24:20,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990800282] [2020-08-18 16:24:20,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 16:24:20,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875391695] [2020-08-18 16:24:20,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:24:20,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:24:20,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:20,699 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 16:24:20,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,720 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 16:24:20,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:24:20,721 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 16:24:20,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,722 INFO L225 Difference]: With dead ends: 19 [2020-08-18 16:24:20,723 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 16:24:20,723 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 [2020-08-18 16:24:20,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 16:24:20,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 16:24:20,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 16:24:20,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 16:24:20,729 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 16:24:20,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,729 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 16:24:20,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:24:20,730 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 16:24:20,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 16:24:20,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,731 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:24:20,731 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 16:24:20,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755720686] [2020-08-18 16:24:20,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,836 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755720686] [2020-08-18 16:24:20,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:24:20,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712439459] [2020-08-18 16:24:20,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:24:20,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:24:20,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:20,839 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 16:24:20,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,887 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 16:24:20,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:24:20,888 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 16:24:20,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,889 INFO L225 Difference]: With dead ends: 20 [2020-08-18 16:24:20,889 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 16:24:20,890 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 [2020-08-18 16:24:20,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 16:24:20,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 16:24:20,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 16:24:20,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 16:24:20,896 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 16:24:20,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,896 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 16:24:20,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:24:20,897 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 16:24:20,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 16:24:20,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,897 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:24:20,898 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 16:24:20,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067444447] [2020-08-18 16:24:20,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,027 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067444447] [2020-08-18 16:24:21,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:24:21,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265102845] [2020-08-18 16:24:21,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:24:21,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:24:21,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:21,031 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 16:24:21,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,071 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 16:24:21,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:24:21,072 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 16:24:21,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,073 INFO L225 Difference]: With dead ends: 21 [2020-08-18 16:24:21,073 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 16:24:21,074 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 [2020-08-18 16:24:21,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 16:24:21,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 16:24:21,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 16:24:21,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 16:24:21,080 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 16:24:21,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,080 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 16:24:21,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:24:21,081 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 16:24:21,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 16:24:21,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:21,082 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:21,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:24:21,082 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:21,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:21,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 16:24:21,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:21,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495147669] [2020-08-18 16:24:21,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:21,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,230 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495147669] [2020-08-18 16:24:21,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:24:21,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190422011] [2020-08-18 16:24:21,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:24:21,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:24:21,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:21,233 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 16:24:21,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,281 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 16:24:21,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:24:21,282 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 16:24:21,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,283 INFO L225 Difference]: With dead ends: 22 [2020-08-18 16:24:21,283 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 16:24:21,284 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 [2020-08-18 16:24:21,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 16:24:21,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 16:24:21,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 16:24:21,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 16:24:21,290 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 16:24:21,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,291 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 16:24:21,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:24:21,291 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 16:24:21,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 16:24:21,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:21,292 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:21,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:24:21,293 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:21,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:21,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 16:24:21,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:21,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393955045] [2020-08-18 16:24:21,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:21,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,546 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393955045] [2020-08-18 16:24:21,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:24:21,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136175457] [2020-08-18 16:24:21,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:24:21,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:24:21,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:21,550 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 12 states. [2020-08-18 16:24:21,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,639 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-08-18 16:24:21,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:24:21,639 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2020-08-18 16:24:21,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,640 INFO L225 Difference]: With dead ends: 21 [2020-08-18 16:24:21,640 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 16:24:21,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:21,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 16:24:21,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 16:24:21,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 16:24:21,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 16:24:21,642 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 16 [2020-08-18 16:24:21,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,642 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 16:24:21,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:24:21,642 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 16:24:21,643 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 16:24:21,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:24:21,645 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 16:24:21,748 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 16:24:21,748 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 16:24:21,748 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 16:24:21,748 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 16:24:21,749 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 16:24:21,749 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 16:24:21,749 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 10 20) the Hoare annotation is: true [2020-08-18 16:24:21,749 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 10 20) no Hoare annotation was computed. [2020-08-18 16:24:21,749 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 10 20) no Hoare annotation was computed. [2020-08-18 16:24:21,750 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)))) [2020-08-18 16:24:21,750 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)))) [2020-08-18 16:24:21,750 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-18 16:24:21,750 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-18 16:24:21,750 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-18 16:24:21,750 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-18 16:24:21,751 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-18 16:24:21,751 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-18 16:24:21,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 04:24:21 BoogieIcfgContainer [2020-08-18 16:24:21,772 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 16:24:21,775 INFO L168 Benchmark]: Toolchain (without parser) took 2514.79 ms. Allocated memory was 140.0 MB in the beginning and 235.4 MB in the end (delta: 95.4 MB). Free memory was 103.0 MB in the beginning and 145.1 MB in the end (delta: -42.2 MB). Peak memory consumption was 53.3 MB. Max. memory is 7.1 GB. [2020-08-18 16:24:21,776 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-18 16:24:21,777 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.79 ms. Allocated memory is still 140.0 MB. Free memory was 102.7 MB in the beginning and 92.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-18 16:24:21,778 INFO L168 Benchmark]: Boogie Preprocessor took 103.93 ms. Allocated memory was 140.0 MB in the beginning and 200.8 MB in the end (delta: 60.8 MB). Free memory was 92.9 MB in the beginning and 179.5 MB in the end (delta: -86.6 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-08-18 16:24:21,779 INFO L168 Benchmark]: RCFGBuilder took 256.11 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 167.9 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. [2020-08-18 16:24:21,780 INFO L168 Benchmark]: TraceAbstraction took 1897.56 ms. Allocated memory was 200.8 MB in the beginning and 235.4 MB in the end (delta: 34.6 MB). Free memory was 167.3 MB in the beginning and 145.1 MB in the end (delta: 22.1 MB). Peak memory consumption was 56.7 MB. Max. memory is 7.1 GB. [2020-08-18 16:24:21,784 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.79 ms. Allocated memory is still 140.0 MB. Free memory was 102.7 MB in the beginning and 92.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.93 ms. Allocated memory was 140.0 MB in the beginning and 200.8 MB in the end (delta: 60.8 MB). Free memory was 92.9 MB in the beginning and 179.5 MB in the end (delta: -86.6 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 256.11 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 167.9 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1897.56 ms. Allocated memory was 200.8 MB in the beginning and 235.4 MB in the end (delta: 34.6 MB). Free memory was 167.3 MB in the beginning and 145.1 MB in the end (delta: 22.1 MB). Peak memory consumption was 56.7 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, 0.6s 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, 0.9s 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...