/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:05:21,528 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:05:21,530 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:05:21,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:05:21,554 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:05:21,555 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:05:21,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:05:21,559 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:05:21,560 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:05:21,561 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:05:21,562 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:05:21,563 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:05:21,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:05:21,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:05:21,566 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:05:21,567 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:05:21,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:05:21,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:05:21,570 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:05:21,572 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:05:21,573 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:05:21,574 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:05:21,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:05:21,577 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:05:21,579 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 02:05:21,579 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 02:05:21,580 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 02:05:21,580 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 02:05:21,581 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 02:05:21,582 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 02:05:21,582 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 02:05:21,583 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 02:05:21,584 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 02:05:21,584 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 02:05:21,585 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 02:05:21,586 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 02:05:21,586 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 02:05:21,586 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 02:05:21,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:05:21,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:05:21,588 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:05:21,589 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 [2020-08-19 02:05:21,612 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:05:21,612 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:05:21,614 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:05:21,614 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:05:21,614 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:05:21,614 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:05:21,615 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:05:21,615 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:05:21,615 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:05:21,615 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:05:21,616 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:05:21,616 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:05:21,616 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:05:21,616 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:05:21,616 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:05:21,617 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:05:21,617 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:05:21,617 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:05:21,617 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:05:21,618 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:05:21,618 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:05:21,618 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:05:21,618 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:05:21,619 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:05:21,619 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:05:21,619 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:05:21,619 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:05:21,619 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:05:21,620 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:05:21,620 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=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 02:05:21,950 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:05:21,962 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:05:21,966 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:05:21,968 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:05:21,968 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:05:21,969 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-19 02:05:22,046 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2fa67f9c/ddbdf4e2dcd7446d8c67ea2be8d0d211/FLAGb4eb335ba [2020-08-19 02:05:22,535 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:05:22,536 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-19 02:05:22,543 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2fa67f9c/ddbdf4e2dcd7446d8c67ea2be8d0d211/FLAGb4eb335ba [2020-08-19 02:05:22,914 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2fa67f9c/ddbdf4e2dcd7446d8c67ea2be8d0d211 [2020-08-19 02:05:22,924 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:05:22,926 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:05:22,928 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:22,928 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:05:22,931 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:05:22,932 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:22" (1/1) ... [2020-08-19 02:05:22,936 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@176ea22d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:22, skipping insertion in model container [2020-08-19 02:05:22,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:22" (1/1) ... [2020-08-19 02:05:22,944 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:05:22,964 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:05:23,220 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:23,227 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:05:23,247 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:23,264 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:05:23,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23 WrapperNode [2020-08-19 02:05:23,266 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:23,267 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:05:23,267 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:05:23,267 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:05:23,281 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,283 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,422 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,426 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,431 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,432 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (1/1) ... [2020-08-19 02:05:23,433 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:05:23,434 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:05:23,434 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:05:23,434 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:05:23,435 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (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 [2020-08-19 02:05:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:05:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:05:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:05:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:05:23,492 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:05:23,493 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:05:23,493 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:05:23,493 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:05:23,493 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:05:23,672 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:05:23,673 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 02:05:23,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:23 BoogieIcfgContainer [2020-08-19 02:05:23,677 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:05:23,678 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:05:23,678 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:05:23,682 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:05:23,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:05:22" (1/3) ... [2020-08-19 02:05:23,683 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40488580 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:23, skipping insertion in model container [2020-08-19 02:05:23,683 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:23" (2/3) ... [2020-08-19 02:05:23,684 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40488580 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:23, skipping insertion in model container [2020-08-19 02:05:23,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:23" (3/3) ... [2020-08-19 02:05:23,686 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-08-19 02:05:23,697 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:05:23,704 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:05:23,719 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:05:23,742 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:05:23,742 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:05:23,742 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:05:23,742 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:05:23,743 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:05:23,743 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:05:23,743 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:05:23,743 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:05:23,759 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 02:05:23,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:05:23,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:23,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:23,765 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:23,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:23,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 02:05:23,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:23,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089560633] [2020-08-19 02:05:23,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:23,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:23,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:23,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089560633] [2020-08-19 02:05:24,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:24,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:05:24,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943666844] [2020-08-19 02:05:24,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:05:24,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:05:24,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:05:24,035 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 02:05:24,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,141 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 02:05:24,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:05:24,145 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 02:05:24,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,168 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:05:24,168 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 02:05:24,174 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 [2020-08-19 02:05:24,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 02:05:24,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 02:05:24,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 02:05:24,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 02:05:24,217 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 02:05:24,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,217 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 02:05:24,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:05:24,218 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 02:05:24,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 02:05:24,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,219 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:05:24,220 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 02:05:24,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509384548] [2020-08-19 02:05:24,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:24,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509384548] [2020-08-19 02:05:24,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:24,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 02:05:24,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079955601] [2020-08-19 02:05:24,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:05:24,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:05:24,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:05:24,345 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 02:05:24,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,364 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 02:05:24,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:05:24,365 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 02:05:24,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,366 INFO L225 Difference]: With dead ends: 18 [2020-08-19 02:05:24,366 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 02:05:24,368 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 [2020-08-19 02:05:24,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 02:05:24,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 02:05:24,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 02:05:24,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 02:05:24,373 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 02:05:24,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,374 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 02:05:24,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:05:24,374 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 02:05:24,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:05:24,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,375 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:05:24,376 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 02:05:24,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859632055] [2020-08-19 02:05:24,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:24,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,482 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859632055] [2020-08-19 02:05:24,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:24,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:05:24,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113515653] [2020-08-19 02:05:24,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:05:24,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:05:24,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:05:24,485 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 02:05:24,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,528 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 02:05:24,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:05:24,529 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 02:05:24,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,530 INFO L225 Difference]: With dead ends: 19 [2020-08-19 02:05:24,530 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 02:05:24,531 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 [2020-08-19 02:05:24,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 02:05:24,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 02:05:24,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 02:05:24,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 02:05:24,536 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 02:05:24,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,537 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 02:05:24,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:05:24,537 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 02:05:24,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 02:05:24,538 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,538 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:05:24,539 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 02:05:24,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109331426] [2020-08-19 02:05:24,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:24,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,674 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109331426] [2020-08-19 02:05:24,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:24,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:05:24,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568125426] [2020-08-19 02:05:24,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:05:24,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:05:24,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:05:24,677 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 02:05:24,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,703 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 02:05:24,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:05:24,704 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 02:05:24,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,705 INFO L225 Difference]: With dead ends: 20 [2020-08-19 02:05:24,705 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 02:05:24,706 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 [2020-08-19 02:05:24,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 02:05:24,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 02:05:24,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:05:24,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 02:05:24,711 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 02:05:24,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,712 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 02:05:24,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:05:24,712 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 02:05:24,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 02:05:24,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,713 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:05:24,713 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 02:05:24,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165429784] [2020-08-19 02:05:24,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:24,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,835 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165429784] [2020-08-19 02:05:24,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:24,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:05:24,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882938995] [2020-08-19 02:05:24,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:05:24,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:05:24,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:05:24,838 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 02:05:24,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,879 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 02:05:24,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:05:24,880 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 02:05:24,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,881 INFO L225 Difference]: With dead ends: 21 [2020-08-19 02:05:24,881 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 02:05:24,882 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 [2020-08-19 02:05:24,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 02:05:24,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 02:05:24,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 02:05:24,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 02:05:24,888 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 02:05:24,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,889 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 02:05:24,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:05:24,889 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 02:05:24,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 02:05:24,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,890 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:05:24,891 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 02:05:24,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1203373448] [2020-08-19 02:05:24,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:25,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:25,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:25,111 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:25,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1203373448] [2020-08-19 02:05:25,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:25,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:05:25,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944911892] [2020-08-19 02:05:25,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:05:25,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:25,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:05:25,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:05:25,116 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 10 states. [2020-08-19 02:05:25,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:25,194 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 02:05:25,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:05:25,195 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2020-08-19 02:05:25,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:25,198 INFO L225 Difference]: With dead ends: 22 [2020-08-19 02:05:25,198 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 02:05:25,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:05:25,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 02:05:25,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 02:05:25,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:05:25,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 02:05:25,205 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 02:05:25,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:25,205 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 02:05:25,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:05:25,205 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 02:05:25,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:05:25,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:25,206 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:25,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:05:25,207 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:25,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:25,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 02:05:25,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:25,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [13650963] [2020-08-19 02:05:25,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:25,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 02:05:25,225 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 02:05:25,225 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 02:05:25,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:05:25,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 02:05:25 BoogieIcfgContainer [2020-08-19 02:05:25,245 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 02:05:25,248 INFO L168 Benchmark]: Toolchain (without parser) took 2321.20 ms. Allocated memory was 139.5 MB in the beginning and 233.3 MB in the end (delta: 93.8 MB). Free memory was 102.4 MB in the beginning and 184.6 MB in the end (delta: -82.2 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:25,249 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-19 02:05:25,250 INFO L168 Benchmark]: CACSL2BoogieTranslator took 338.66 ms. Allocated memory is still 139.5 MB. Free memory was 102.2 MB in the beginning and 92.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:25,251 INFO L168 Benchmark]: Boogie Preprocessor took 166.88 ms. Allocated memory was 139.5 MB in the beginning and 205.0 MB in the end (delta: 65.5 MB). Free memory was 92.8 MB in the beginning and 183.5 MB in the end (delta: -90.7 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:25,252 INFO L168 Benchmark]: RCFGBuilder took 243.24 ms. Allocated memory is still 205.0 MB. Free memory was 183.5 MB in the beginning and 171.5 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:25,253 INFO L168 Benchmark]: TraceAbstraction took 1567.22 ms. Allocated memory was 205.0 MB in the beginning and 233.3 MB in the end (delta: 28.3 MB). Free memory was 171.5 MB in the beginning and 184.6 MB in the end (delta: -13.0 MB). Peak memory consumption was 15.3 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:25,257 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 338.66 ms. Allocated memory is still 139.5 MB. Free memory was 102.2 MB in the beginning and 92.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 166.88 ms. Allocated memory was 139.5 MB in the beginning and 205.0 MB in the end (delta: 65.5 MB). Free memory was 92.8 MB in the beginning and 183.5 MB in the end (delta: -90.7 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 243.24 ms. Allocated memory is still 205.0 MB. Free memory was 183.5 MB in the beginning and 171.5 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1567.22 ms. Allocated memory was 205.0 MB in the beginning and 233.3 MB in the end (delta: 28.3 MB). Free memory was 171.5 MB in the beginning and 184.6 MB in the end (delta: -13.0 MB). Peak memory consumption was 15.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(x != 6) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 182 SDs, 0 SdLazy, 111 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s 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, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 2689 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/35 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 incorrect! Received shutdown request...