/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_1b.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:33:15,888 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:33:15,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:33:15,910 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:33:15,955 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:33:15,956 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:33:15,956 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:33:15,959 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:33:15,983 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:33:15,983 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:33:15,984 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:33:15,984 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:33:15,984 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:33:15,985 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:33:15,985 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:33:15,986 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:33:15,986 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:33:15,986 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:33:15,987 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:33:15,987 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:33:16,226 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:33:16,248 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:33:16,250 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:33:16,251 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:33:16,252 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:33:16,252 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_1b.c [2021-05-02 13:33:16,311 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f77c084a3/1364dbdbf98041549eba16e6f91e105f/FLAGf01fddd03 [2021-05-02 13:33:16,709 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:33:16,710 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1b.c [2021-05-02 13:33:16,717 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f77c084a3/1364dbdbf98041549eba16e6f91e105f/FLAGf01fddd03 [2021-05-02 13:33:16,734 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f77c084a3/1364dbdbf98041549eba16e6f91e105f [2021-05-02 13:33:16,737 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:33:16,738 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:33:16,741 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:33:16,742 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:33:16,745 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:33:16,745 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,746 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d554f6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16, skipping insertion in model container [2021-05-02 13:33:16,746 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,751 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:33:16,763 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:33:16,880 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1b.c[674,687] [2021-05-02 13:33:16,884 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:33:16,891 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:33:16,933 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1b.c[674,687] [2021-05-02 13:33:16,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:33:16,942 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:33:16,943 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16 WrapperNode [2021-05-02 13:33:16,943 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:33:16,944 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:33:16,944 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:33:16,945 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:33:16,951 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,956 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,956 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,959 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,963 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,964 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... [2021-05-02 13:33:16,968 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:33:16,969 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:33:16,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:33:16,969 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:33:16,970 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:33:17,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:33:17,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:33:17,029 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:33:17,029 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:33:17,029 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:33:17,029 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:33:17,029 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:33:17,030 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:33:17,030 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:33:17,030 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:33:17,030 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:33:17,030 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:33:17,031 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:33:17,031 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:33:17,233 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:33:17,233 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:33:17,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:33:17 BoogieIcfgContainer [2021-05-02 13:33:17,234 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:33:17,235 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:33:17,235 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:33:17,237 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:33:17,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:33:16" (1/3) ... [2021-05-02 13:33:17,237 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5dc56c19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:33:17, skipping insertion in model container [2021-05-02 13:33:17,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:16" (2/3) ... [2021-05-02 13:33:17,238 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5dc56c19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:33:17, skipping insertion in model container [2021-05-02 13:33:17,238 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:33:17" (3/3) ... [2021-05-02 13:33:17,238 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1b.c [2021-05-02 13:33:17,250 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:33:17,252 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:33:17,269 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:33:17,285 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:33:17,286 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:33:17,286 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:33:17,286 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:33:17,286 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:33:17,286 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:33:17,286 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:33:17,286 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:33:17,297 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:33:17,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:33:17,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:17,300 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:17,300 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:17,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:17,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1887993331, now seen corresponding path program 1 times [2021-05-02 13:33:17,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:17,312 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143668632] [2021-05-02 13:33:17,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:17,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:17,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:17,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:17,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143668632] [2021-05-02 13:33:17,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143668632] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:17,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:17,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:33:17,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962039689] [2021-05-02 13:33:17,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:33:17,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:17,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:33:17,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:33:17,507 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:17,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:17,551 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-05-02 13:33:17,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:33:17,553 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 13:33:17,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:17,557 INFO L225 Difference]: With dead ends: 24 [2021-05-02 13:33:17,557 INFO L226 Difference]: Without dead ends: 11 [2021-05-02 13:33:17,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:33:17,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-05-02 13:33:17,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-05-02 13:33:17,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:17,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2021-05-02 13:33:17,583 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2021-05-02 13:33:17,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:17,583 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2021-05-02 13:33:17,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:17,584 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2021-05-02 13:33:17,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:33:17,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:17,584 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:17,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:33:17,585 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:17,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:17,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1887999097, now seen corresponding path program 1 times [2021-05-02 13:33:17,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:17,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329767020] [2021-05-02 13:33:17,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:17,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:17,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:17,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:17,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329767020] [2021-05-02 13:33:17,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329767020] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:17,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:17,684 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:17,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564639728] [2021-05-02 13:33:17,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:17,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:17,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:17,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:17,686 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:17,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:17,749 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2021-05-02 13:33:17,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:17,750 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 13:33:17,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:17,750 INFO L225 Difference]: With dead ends: 16 [2021-05-02 13:33:17,750 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 13:33:17,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 69.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:17,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 13:33:17,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-05-02 13:33:17,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:17,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-05-02 13:33:17,754 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2021-05-02 13:33:17,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:17,754 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-05-02 13:33:17,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:17,755 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-05-02 13:33:17,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:33:17,755 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:17,755 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:17,755 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:33:17,755 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:17,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:17,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1889274843, now seen corresponding path program 1 times [2021-05-02 13:33:17,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:17,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704593396] [2021-05-02 13:33:17,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:17,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:17,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:17,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:17,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704593396] [2021-05-02 13:33:17,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704593396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:17,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172764955] [2021-05-02 13:33:17,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:17,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:33:17,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:17,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:17,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:17,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:17,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172764955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:17,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:17,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:33:17,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401260844] [2021-05-02 13:33:17,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:33:17,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:17,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:33:17,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:33:17,943 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:18,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:18,033 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2021-05-02 13:33:18,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:33:18,034 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:33:18,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:18,034 INFO L225 Difference]: With dead ends: 18 [2021-05-02 13:33:18,034 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 13:33:18,035 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 84.6ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:18,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 13:33:18,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-05-02 13:33:18,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:18,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-05-02 13:33:18,045 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2021-05-02 13:33:18,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:18,045 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-05-02 13:33:18,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:18,046 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-05-02 13:33:18,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:33:18,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:18,046 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:18,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 13:33:18,257 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:18,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:18,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1179700547, now seen corresponding path program 2 times [2021-05-02 13:33:18,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:18,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788962966] [2021-05-02 13:33:18,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:18,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:18,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:18,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:18,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:18,314 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:18,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788962966] [2021-05-02 13:33:18,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788962966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:18,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791367761] [2021-05-02 13:33:18,315 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:18,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:18,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:18,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:33:18,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:18,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,478 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:18,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791367761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:18,478 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:18,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:33:18,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085767245] [2021-05-02 13:33:18,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:33:18,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:18,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:33:18,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:33:18,480 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:18,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:18,605 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2021-05-02 13:33:18,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:33:18,606 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 13:33:18,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:18,607 INFO L225 Difference]: With dead ends: 20 [2021-05-02 13:33:18,607 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:33:18,608 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 112.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:18,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:33:18,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 13:33:18,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:18,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 13:33:18,614 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2021-05-02 13:33:18,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:18,614 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 13:33:18,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:18,614 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 13:33:18,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:33:18,615 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:18,615 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:18,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:18,821 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:18,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:18,821 INFO L82 PathProgramCache]: Analyzing trace with hash -177482015, now seen corresponding path program 3 times [2021-05-02 13:33:18,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:18,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809914815] [2021-05-02 13:33:18,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:18,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:18,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:18,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:18,886 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:18,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:18,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809914815] [2021-05-02 13:33:18,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809914815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:18,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592857874] [2021-05-02 13:33:18,887 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:18,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:33:18,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:18,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:33:18,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:18,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,970 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:18,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592857874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:18,971 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:18,971 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:33:18,971 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462149855] [2021-05-02 13:33:18,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:33:18,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:18,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:33:18,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:18,972 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:19,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:19,078 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 13:33:19,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:33:19,079 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 13:33:19,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:19,082 INFO L225 Difference]: With dead ends: 22 [2021-05-02 13:33:19,082 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:33:19,083 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 105.3ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:33:19,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:33:19,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-02 13:33:19,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:19,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 13:33:19,089 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2021-05-02 13:33:19,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:19,090 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 13:33:19,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:19,090 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 13:33:19,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:33:19,090 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:19,090 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:19,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:19,297 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:19,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:19,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1240133887, now seen corresponding path program 4 times [2021-05-02 13:33:19,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:19,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496843539] [2021-05-02 13:33:19,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:19,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:19,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:19,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:19,386 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:19,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:19,387 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496843539] [2021-05-02 13:33:19,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496843539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:19,387 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312419755] [2021-05-02 13:33:19,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:19,412 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:33:19,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:19,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:33:19,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:19,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,464 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:19,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312419755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:19,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:19,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:33:19,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294755116] [2021-05-02 13:33:19,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:33:19,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:19,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:33:19,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:33:19,466 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:19,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:19,626 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-05-02 13:33:19,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:33:19,627 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:33:19,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:19,627 INFO L225 Difference]: With dead ends: 24 [2021-05-02 13:33:19,627 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 13:33:19,628 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 153.9ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:33:19,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 13:33:19,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 13:33:19,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:19,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 13:33:19,630 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2021-05-02 13:33:19,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:19,631 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 13:33:19,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:19,631 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 13:33:19,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:33:19,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:19,631 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:19,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:19,846 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:19,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:19,847 INFO L82 PathProgramCache]: Analyzing trace with hash 2064382877, now seen corresponding path program 5 times [2021-05-02 13:33:19,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:19,847 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427154775] [2021-05-02 13:33:19,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:19,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:19,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:19,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:19,916 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:19,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:19,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427154775] [2021-05-02 13:33:19,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427154775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:19,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189536757] [2021-05-02 13:33:19,917 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:19,948 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 13:33:19,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:19,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:33:19,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:19,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:19,993 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:19,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189536757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:19,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:19,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:33:19,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246866421] [2021-05-02 13:33:19,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:33:19,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:19,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:33:19,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:19,994 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:20,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:20,133 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2021-05-02 13:33:20,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:33:20,133 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 13:33:20,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:20,133 INFO L225 Difference]: With dead ends: 25 [2021-05-02 13:33:20,133 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 13:33:20,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 151.4ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:33:20,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 13:33:20,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 13:33:20,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:20,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 13:33:20,136 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2021-05-02 13:33:20,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:20,137 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 13:33:20,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:20,137 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 13:33:20,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:33:20,137 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:20,137 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:20,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:33:20,345 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:20,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:20,345 INFO L82 PathProgramCache]: Analyzing trace with hash -401287493, now seen corresponding path program 6 times [2021-05-02 13:33:20,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:20,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330208263] [2021-05-02 13:33:20,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:20,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 13:33:20,353 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 13:33:20,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 13:33:20,358 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 13:33:20,368 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 13:33:20,368 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 13:33:20,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 13:33:20,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 01:33:20 BoogieIcfgContainer [2021-05-02 13:33:20,394 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 13:33:20,395 INFO L168 Benchmark]: Toolchain (without parser) took 3656.47 ms. Allocated memory was 191.9 MB in the beginning and 244.3 MB in the end (delta: 52.4 MB). Free memory was 156.5 MB in the beginning and 125.9 MB in the end (delta: 30.6 MB). Peak memory consumption was 83.2 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:20,395 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 191.9 MB. Free memory is still 173.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 13:33:20,395 INFO L168 Benchmark]: CACSL2BoogieTranslator took 201.50 ms. Allocated memory is still 191.9 MB. Free memory was 156.4 MB in the beginning and 175.2 MB in the end (delta: -18.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:20,396 INFO L168 Benchmark]: Boogie Preprocessor took 24.25 ms. Allocated memory is still 191.9 MB. Free memory was 174.7 MB in the beginning and 173.6 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:20,396 INFO L168 Benchmark]: RCFGBuilder took 265.09 ms. Allocated memory is still 191.9 MB. Free memory was 173.6 MB in the beginning and 160.5 MB in the end (delta: 13.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:20,397 INFO L168 Benchmark]: TraceAbstraction took 3159.51 ms. Allocated memory was 191.9 MB in the beginning and 244.3 MB in the end (delta: 52.4 MB). Free memory was 160.5 MB in the beginning and 125.9 MB in the end (delta: 34.6 MB). Peak memory consumption was 87.6 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:20,399 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 191.9 MB. Free memory is still 173.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 201.50 ms. Allocated memory is still 191.9 MB. Free memory was 156.4 MB in the beginning and 175.2 MB in the end (delta: -18.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 24.25 ms. Allocated memory is still 191.9 MB. Free memory was 174.7 MB in the beginning and 173.6 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 265.09 ms. Allocated memory is still 191.9 MB. Free memory was 173.6 MB in the beginning and 160.5 MB in the end (delta: 13.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3159.51 ms. Allocated memory was 191.9 MB in the beginning and 244.3 MB in the end (delta: 52.4 MB). Free memory was 160.5 MB in the beginning and 125.9 MB in the end (delta: 34.6 MB). Peak memory consumption was 87.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 23]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int a = 6; [L19] a = 0 VAL [a=0] [L19] COND TRUE a < 6 VAL [a=0] [L19] ++a VAL [a=1] [L19] COND TRUE a < 6 VAL [a=1] [L19] ++a VAL [a=2] [L19] COND TRUE a < 6 VAL [a=2] [L19] ++a VAL [a=3] [L19] COND TRUE a < 6 VAL [a=3] [L19] ++a VAL [a=4] [L19] COND TRUE a < 6 VAL [a=4] [L19] ++a VAL [a=5] [L19] COND TRUE a < 6 VAL [a=5] [L19] ++a VAL [a=6] [L19] COND FALSE !(a < 6) VAL [a=6] [L22] COND TRUE a == 6 VAL [a=6] [L23] reach_error() VAL [a=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3093.5ms, OverallIterations: 8, TraceHistogramMax: 6, EmptinessCheckTime: 9.2ms, AutomataDifference: 759.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 6.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 63 SDtfs, 86 SDslu, 71 SDs, 0 SdLazy, 128 SolverSat, 36 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 156.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 141 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 731.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=7, InterpolantAutomatonStates: 42, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 45.0ms AutomataMinimizationTime, 7 MinimizatonAttempts, 5 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 44.3ms SsaConstructionTime, 151.7ms SatisfiabilityAnalysisTime, 781.5ms InterpolantComputationTime, 189 NumberOfCodeBlocks, 188 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 156 ConstructedInterpolants, 0 QuantifiedInterpolants, 508 SizeOfPredicates, 0 NumberOfNonLiveVariables, 411 ConjunctsInSsa, 25 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 0/110 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...