/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_3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:33:31,073 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:33:31,075 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:33:31,109 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:33:31,169 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:33:31,170 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:33:31,170 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:33:31,174 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 13:33:31,189 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:33:31,189 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:33:31,190 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:33:31,190 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:33:31,190 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:33:31,190 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:33:31,190 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:33:31,191 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:33:31,192 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:33:31,192 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:33:31,192 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:33:31,193 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:33:31,193 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:33:31,193 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:33:31,427 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:33:31,442 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:33:31,443 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:33:31,444 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:33:31,445 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:33:31,446 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_3.c [2021-05-02 13:33:31,498 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ba2797ae/ba3ce753388f4f47ae15695fcc6209d5/FLAGad15c3fbc [2021-05-02 13:33:31,848 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:33:31,850 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_3.c [2021-05-02 13:33:31,854 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ba2797ae/ba3ce753388f4f47ae15695fcc6209d5/FLAGad15c3fbc [2021-05-02 13:33:31,870 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ba2797ae/ba3ce753388f4f47ae15695fcc6209d5 [2021-05-02 13:33:31,873 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:33:31,874 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:33:31,876 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:33:31,876 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:33:31,879 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:33:31,880 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:33:31" (1/1) ... [2021-05-02 13:33:31,880 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@641fe10e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:31, skipping insertion in model container [2021-05-02 13:33:31,880 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:33:31" (1/1) ... [2021-05-02 13:33:31,885 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:33:31,895 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:33:32,029 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_3.c[784,797] [2021-05-02 13:33:32,037 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:33:32,045 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:33:32,055 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_3.c[784,797] [2021-05-02 13:33:32,055 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:33:32,066 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:33:32,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32 WrapperNode [2021-05-02 13:33:32,066 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:33:32,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:33:32,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:33:32,068 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:33:32,101 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,109 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,116 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,125 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,129 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,130 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (1/1) ... [2021-05-02 13:33:32,135 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:33:32,137 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:33:32,137 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:33:32,137 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:33:32,138 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (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 13:33:32,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:33:32,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:33:32,215 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:33:32,215 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:33:32,216 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:33:32,216 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:33:32,216 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:33:32,217 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:33:32,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:33:32,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:33:32,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:33:32,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:33:32,218 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:33:32,218 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:33:32,365 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:33:32,366 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 13:33:32,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:33:32 BoogieIcfgContainer [2021-05-02 13:33:32,367 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:33:32,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:33:32,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:33:32,370 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:33:32,370 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:33:31" (1/3) ... [2021-05-02 13:33:32,371 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fec7027 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:33:32, skipping insertion in model container [2021-05-02 13:33:32,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:32" (2/3) ... [2021-05-02 13:33:32,371 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fec7027 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:33:32, skipping insertion in model container [2021-05-02 13:33:32,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:33:32" (3/3) ... [2021-05-02 13:33:32,372 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_3.c [2021-05-02 13:33:32,376 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:33:32,378 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:33:32,402 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:33:32,418 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:33:32,418 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:33:32,418 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:33:32,418 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:33:32,418 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:33:32,418 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:33:32,418 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:33:32,419 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:33:32,442 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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 13:33:32,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:33:32,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:32,446 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:32,446 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:32,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:32,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1607939523, now seen corresponding path program 1 times [2021-05-02 13:33:32,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:32,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348306565] [2021-05-02 13:33:32,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:32,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:32,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:32,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:32,657 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 13:33:32,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:32,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348306565] [2021-05-02 13:33:32,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348306565] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:32,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:32,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:33:32,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071748259] [2021-05-02 13:33:32,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:33:32,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:32,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:33:32,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:33:32,671 INFO L87 Difference]: Start difference. First operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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 13:33:32,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:32,697 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2021-05-02 13:33:32,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:33:32,699 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 13:33:32,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:32,703 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:33:32,703 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 13:33:32,705 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:33:32,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 13:33:32,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 13:33:32,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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 13:33:32,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-05-02 13:33:32,728 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2021-05-02 13:33:32,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:32,728 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-05-02 13:33:32,728 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 13:33:32,728 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-05-02 13:33:32,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:33:32,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:32,729 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:32,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:33:32,729 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:32,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:32,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1607968353, now seen corresponding path program 1 times [2021-05-02 13:33:32,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:32,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463192733] [2021-05-02 13:33:32,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:32,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:32,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:32,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:32,819 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 13:33:32,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:32,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463192733] [2021-05-02 13:33:32,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463192733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:32,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:32,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:32,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492873584] [2021-05-02 13:33:32,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:32,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:32,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:32,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:32,822 INFO L87 Difference]: Start difference. First operand 15 states and 17 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 13:33:32,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:32,903 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-05-02 13:33:32,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:32,903 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 13:33:32,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:32,904 INFO L225 Difference]: With dead ends: 24 [2021-05-02 13:33:32,904 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 13:33:32,905 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:32,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 13:33:32,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 16. [2021-05-02 13:33:32,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 12 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 13:33:32,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 13:33:32,909 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2021-05-02 13:33:32,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:32,910 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 13:33:32,910 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 13:33:32,910 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 13:33:32,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:33:32,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:32,910 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:32,910 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:33:32,911 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:32,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:32,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1181899718, now seen corresponding path program 1 times [2021-05-02 13:33:32,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:32,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840597304] [2021-05-02 13:33:32,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:32,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:32,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:32,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:33,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:33,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840597304] [2021-05-02 13:33:33,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840597304] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:33,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:33,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:33,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292884430] [2021-05-02 13:33:33,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:33,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:33,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:33,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:33,018 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 13:33:33,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:33,085 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2021-05-02 13:33:33,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:33,086 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 12 [2021-05-02 13:33:33,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:33,086 INFO L225 Difference]: With dead ends: 29 [2021-05-02 13:33:33,086 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:33:33,087 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:33,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:33:33,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-05-02 13:33:33,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 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 13:33:33,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 13:33:33,099 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-05-02 13:33:33,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:33,100 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 13:33:33,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 13:33:33,100 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 13:33:33,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:33:33,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:33,101 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:33,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:33:33,102 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:33,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:33,105 INFO L82 PathProgramCache]: Analyzing trace with hash -2039168997, now seen corresponding path program 1 times [2021-05-02 13:33:33,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:33,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915900126] [2021-05-02 13:33:33,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:33,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:33,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:33,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:33,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915900126] [2021-05-02 13:33:33,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915900126] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:33,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:33,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:33,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18202865] [2021-05-02 13:33:33,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:33,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:33,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:33,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:33,186 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 13:33:33,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:33,258 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2021-05-02 13:33:33,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:33,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 15 [2021-05-02 13:33:33,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:33,260 INFO L225 Difference]: With dead ends: 29 [2021-05-02 13:33:33,260 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:33:33,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:33,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:33:33,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-02 13:33:33,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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 13:33:33,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-02 13:33:33,268 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-05-02 13:33:33,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:33,268 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-02 13:33:33,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 13:33:33,269 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-02 13:33:33,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:33:33,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:33,269 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:33,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:33:33,269 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:33,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:33,270 INFO L82 PathProgramCache]: Analyzing trace with hash -434811975, now seen corresponding path program 1 times [2021-05-02 13:33:33,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:33,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850815048] [2021-05-02 13:33:33,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:33,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:33,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,345 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:33,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:33,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850815048] [2021-05-02 13:33:33,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850815048] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:33,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847058887] [2021-05-02 13:33:33,346 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 13:33:33,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:33:33,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:33,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:33,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:33,491 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:33,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847058887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:33,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:33,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:33:33,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24768657] [2021-05-02 13:33:33,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:33:33,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:33,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:33:33,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:33:33,496 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 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 13:33:33,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:33,595 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-05-02 13:33:33,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:33:33,596 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 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 13:33:33,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:33,597 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:33:33,597 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 13:33:33,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 87.4ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:33,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 13:33:33,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 13:33:33,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.1875) internal successors, (19), 16 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 13:33:33,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-02 13:33:33,606 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2021-05-02 13:33:33,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:33,606 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-02 13:33:33,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 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 13:33:33,606 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-02 13:33:33,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:33:33,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:33,607 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:33,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:33,821 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:33,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:33,822 INFO L82 PathProgramCache]: Analyzing trace with hash -540973097, now seen corresponding path program 2 times [2021-05-02 13:33:33,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:33,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432812293] [2021-05-02 13:33:33,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:33,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:33,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:33,868 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:33:33,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:33,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432812293] [2021-05-02 13:33:33,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432812293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:33,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478750016] [2021-05-02 13:33:33,869 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 13:33:33,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:33,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:33,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:33:33,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:33,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:33,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:33,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:33,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:33,951 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:33,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478750016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:33,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:33,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 13:33:33,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948074913] [2021-05-02 13:33:33,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:33:33,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:33,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:33:33,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:33,952 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 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 13:33:34,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:34,265 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-05-02 13:33:34,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:33:34,266 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 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 13:33:34,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:34,266 INFO L225 Difference]: With dead ends: 55 [2021-05-02 13:33:34,266 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 13:33:34,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 277.3ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:33:34,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 13:33:34,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2021-05-02 13:33:34,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 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 13:33:34,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 13:33:34,272 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 19 [2021-05-02 13:33:34,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:34,272 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 13:33:34,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 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 13:33:34,272 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 13:33:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:33:34,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:34,273 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:34,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:34,489 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:34,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:34,490 INFO L82 PathProgramCache]: Analyzing trace with hash -604719462, now seen corresponding path program 3 times [2021-05-02 13:33:34,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:34,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210293808] [2021-05-02 13:33:34,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:34,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:34,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:34,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:34,529 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 13:33:34,529 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:34,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210293808] [2021-05-02 13:33:34,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210293808] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:34,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775765833] [2021-05-02 13:33:34,529 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 13:33:34,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:33:34,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:34,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:33:34,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:34,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:34,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 13:33:34,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775765833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:34,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:34,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:33:34,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221548589] [2021-05-02 13:33:34,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:33:34,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:34,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:33:34,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:33:34,644 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 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 13:33:34,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:34,740 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2021-05-02 13:33:34,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:33:34,740 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 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 30 [2021-05-02 13:33:34,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:34,741 INFO L225 Difference]: With dead ends: 75 [2021-05-02 13:33:34,741 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 13:33:34,741 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 53.7ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:34,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 13:33:34,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 52. [2021-05-02 13:33:34,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 48 states have internal predecessors, (55), 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 13:33:34,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-05-02 13:33:34,748 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 30 [2021-05-02 13:33:34,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:34,748 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-05-02 13:33:34,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 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 13:33:34,749 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-05-02 13:33:34,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:33:34,749 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:34,749 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:34,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:34,957 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:34,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:34,957 INFO L82 PathProgramCache]: Analyzing trace with hash 735564927, now seen corresponding path program 4 times [2021-05-02 13:33:34,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:34,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64952086] [2021-05-02 13:33:34,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:34,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:35,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:35,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:35,012 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 82 proven. 9 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:33:35,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:35,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64952086] [2021-05-02 13:33:35,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64952086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:35,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727416968] [2021-05-02 13:33:35,013 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 13:33:35,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:33:35,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:35,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:33:35,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:35,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,126 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 82 proven. 9 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:33:35,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727416968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:35,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:35,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:33:35,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668475502] [2021-05-02 13:33:35,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:33:35,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:35,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:33:35,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:35,128 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 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 13:33:35,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:35,291 INFO L93 Difference]: Finished difference Result 101 states and 116 transitions. [2021-05-02 13:33:35,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:33:35,292 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 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 51 [2021-05-02 13:33:35,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:35,293 INFO L225 Difference]: With dead ends: 101 [2021-05-02 13:33:35,293 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 13:33:35,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 122.1ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:33:35,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 13:33:35,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2021-05-02 13:33:35,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 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 13:33:35,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 66 transitions. [2021-05-02 13:33:35,301 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 66 transitions. Word has length 51 [2021-05-02 13:33:35,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:35,301 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 66 transitions. [2021-05-02 13:33:35,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 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 13:33:35,301 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 66 transitions. [2021-05-02 13:33:35,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:33:35,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:35,302 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:35,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:35,507 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:35,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:35,507 INFO L82 PathProgramCache]: Analyzing trace with hash 954849791, now seen corresponding path program 5 times [2021-05-02 13:33:35,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:35,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352414001] [2021-05-02 13:33:35,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:35,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:35,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:35,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:35,581 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 130 proven. 16 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-05-02 13:33:35,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:35,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352414001] [2021-05-02 13:33:35,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352414001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:35,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284695956] [2021-05-02 13:33:35,581 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 13:33:35,615 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:33:35,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:35,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:33:35,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:35,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:35,719 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 218 proven. 16 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-05-02 13:33:35,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284695956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:35,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:35,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:33:35,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765772834] [2021-05-02 13:33:35,720 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:33:35,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:35,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:33:35,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:33:35,721 INFO L87 Difference]: Start difference. First operand 60 states and 66 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 13:33:35,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:35,884 INFO L93 Difference]: Finished difference Result 115 states and 130 transitions. [2021-05-02 13:33:35,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:33:35,885 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 59 [2021-05-02 13:33:35,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:35,885 INFO L225 Difference]: With dead ends: 115 [2021-05-02 13:33:35,885 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 13:33:35,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 130.9ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:33:35,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 13:33:35,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 13:33:35,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 64 states have (on average 1.109375) internal successors, (71), 64 states have internal predecessors, (71), 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 13:33:35,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-05-02 13:33:35,894 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 59 [2021-05-02 13:33:35,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:35,894 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-05-02 13:33:35,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 13:33:35,894 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-05-02 13:33:35,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 13:33:35,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:35,895 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:36,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:36,113 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:36,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:36,113 INFO L82 PathProgramCache]: Analyzing trace with hash 2144436095, now seen corresponding path program 6 times [2021-05-02 13:33:36,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:36,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863616297] [2021-05-02 13:33:36,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:36,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:36,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:36,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:36,194 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 190 proven. 25 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-05-02 13:33:36,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:36,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863616297] [2021-05-02 13:33:36,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863616297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:36,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731800057] [2021-05-02 13:33:36,194 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:36,236 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-05-02 13:33:36,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:36,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:33:36,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:36,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 318 proven. 25 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-05-02 13:33:36,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731800057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:36,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:36,345 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:33:36,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60625549] [2021-05-02 13:33:36,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:33:36,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:36,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:33:36,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:36,346 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 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 13:33:36,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:36,491 INFO L93 Difference]: Finished difference Result 125 states and 140 transitions. [2021-05-02 13:33:36,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:33:36,492 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 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 67 [2021-05-02 13:33:36,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:36,492 INFO L225 Difference]: With dead ends: 125 [2021-05-02 13:33:36,493 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:33:36,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 136.1ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:33:36,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:33:36,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-02 13:33:36,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 72 states have internal predecessors, (79), 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 13:33:36,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-05-02 13:33:36,511 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 67 [2021-05-02 13:33:36,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:36,511 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-05-02 13:33:36,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 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 13:33:36,511 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-05-02 13:33:36,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 13:33:36,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:36,512 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:36,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:36,727 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:36,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:36,727 INFO L82 PathProgramCache]: Analyzing trace with hash 275596543, now seen corresponding path program 7 times [2021-05-02 13:33:36,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:36,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332290606] [2021-05-02 13:33:36,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:36,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:36,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:36,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:36,800 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 355 proven. 89 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-05-02 13:33:36,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:36,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332290606] [2021-05-02 13:33:36,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332290606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:36,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415311981] [2021-05-02 13:33:36,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:36,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:36,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:33:36,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:36,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:36,937 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 355 proven. 89 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-05-02 13:33:36,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415311981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:36,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:36,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:33:36,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742670904] [2021-05-02 13:33:36,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:33:36,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:36,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:33:36,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:33:36,939 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 states have internal predecessors, (33), 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 13:33:37,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:37,026 INFO L93 Difference]: Finished difference Result 172 states and 187 transitions. [2021-05-02 13:33:37,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:33:37,026 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 states have internal predecessors, (33), 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 75 [2021-05-02 13:33:37,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:37,027 INFO L225 Difference]: With dead ends: 172 [2021-05-02 13:33:37,027 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 13:33:37,028 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 69.8ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:37,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 13:33:37,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 106. [2021-05-02 13:33:37,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 102 states have (on average 1.088235294117647) internal successors, (111), 102 states have internal predecessors, (111), 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 13:33:37,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-05-02 13:33:37,047 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 75 [2021-05-02 13:33:37,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:37,048 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-05-02 13:33:37,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 states have internal predecessors, (33), 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 13:33:37,048 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-05-02 13:33:37,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 13:33:37,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:37,052 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:37,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:37,265 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:37,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:37,265 INFO L82 PathProgramCache]: Analyzing trace with hash 2068267583, now seen corresponding path program 8 times [2021-05-02 13:33:37,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:37,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035413288] [2021-05-02 13:33:37,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:37,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:37,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:37,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:37,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1538 backedges. 792 proven. 264 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2021-05-02 13:33:37,340 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:37,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035413288] [2021-05-02 13:33:37,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035413288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:37,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903955413] [2021-05-02 13:33:37,340 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:37,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:37,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:37,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:33:37,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:37,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:37,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:37,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:37,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:37,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:37,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:37,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1538 backedges. 792 proven. 264 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2021-05-02 13:33:37,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903955413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:37,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:37,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:33:37,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352264574] [2021-05-02 13:33:37,520 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:33:37,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:37,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:33:37,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:37,522 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 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 13:33:37,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:37,658 INFO L93 Difference]: Finished difference Result 217 states and 235 transitions. [2021-05-02 13:33:37,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:33:37,659 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 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 105 [2021-05-02 13:33:37,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:37,659 INFO L225 Difference]: With dead ends: 217 [2021-05-02 13:33:37,659 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 13:33:37,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 101.3ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:33:37,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 13:33:37,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 136. [2021-05-02 13:33:37,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 132 states have (on average 1.0833333333333333) internal successors, (143), 132 states have internal predecessors, (143), 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 13:33:37,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-05-02 13:33:37,670 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 105 [2021-05-02 13:33:37,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:37,671 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-05-02 13:33:37,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 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 13:33:37,671 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-05-02 13:33:37,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 13:33:37,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:37,672 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:37,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:33:37,885 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:37,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:37,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1520409151, now seen corresponding path program 9 times [2021-05-02 13:33:37,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:37,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754901265] [2021-05-02 13:33:37,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:37,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:37,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:37,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:37,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2745 backedges. 1403 proven. 526 refuted. 0 times theorem prover too weak. 816 trivial. 0 not checked. [2021-05-02 13:33:37,950 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:37,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754901265] [2021-05-02 13:33:37,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754901265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:37,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462839914] [2021-05-02 13:33:37,950 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:38,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-05-02 13:33:38,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:38,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:33:38,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:38,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:38,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2745 backedges. 1677 proven. 0 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2021-05-02 13:33:38,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462839914] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:38,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:33:38,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [8] total 17 [2021-05-02 13:33:38,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644699504] [2021-05-02 13:33:38,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:33:38,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:38,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:33:38,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:33:38,320 INFO L87 Difference]: Start difference. First operand 136 states and 146 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (2), 1 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 13:33:38,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:38,356 INFO L93 Difference]: Finished difference Result 136 states and 146 transitions. [2021-05-02 13:33:38,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:33:38,356 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (2), 1 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 135 [2021-05-02 13:33:38,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:38,357 INFO L225 Difference]: With dead ends: 136 [2021-05-02 13:33:38,357 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 13:33:38,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 112.7ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:33:38,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 13:33:38,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 13:33:38,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 13:33:38,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 13:33:38,358 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 135 [2021-05-02 13:33:38,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:38,358 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 13:33:38,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (2), 1 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 13:33:38,358 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 13:33:38,358 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 13:33:38,575 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:38,577 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 13:33:38,782 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 51 [2021-05-02 13:33:38,890 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 13) no Hoare annotation was computed. [2021-05-02 13:33:38,890 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 13) no Hoare annotation was computed. [2021-05-02 13:33:38,890 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 13) no Hoare annotation was computed. [2021-05-02 13:33:38,890 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 13:33:38,891 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point L29(line 29) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 15 32) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point L23-2(lines 23 25) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L194 CegarLoopUtils]: At program point L23-3(lines 23 25) the Hoare annotation is: (and (< main_~b~0 6) (< main_~a~0 6) (< main_~c~0 7)) [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point L21-2(lines 21 27) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L194 CegarLoopUtils]: At program point L21-3(lines 21 27) the Hoare annotation is: (and (<= 6 main_~c~0) (< main_~a~0 7) (< main_~b~0 7) (<= 6 main_~b~0) (< main_~c~0 7)) [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point L21-4(lines 15 32) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 15 32) no Hoare annotation was computed. [2021-05-02 13:33:38,891 INFO L198 CegarLoopUtils]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 29) no Hoare annotation was computed. [2021-05-02 13:33:38,892 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 15 32) the Hoare annotation is: true [2021-05-02 13:33:38,892 INFO L198 CegarLoopUtils]: For program point L28-1(lines 28 30) no Hoare annotation was computed. [2021-05-02 13:33:38,892 INFO L198 CegarLoopUtils]: For program point L22-2(lines 22 26) no Hoare annotation was computed. [2021-05-02 13:33:38,892 INFO L194 CegarLoopUtils]: At program point L22-3(lines 22 26) the Hoare annotation is: (and (<= 6 main_~c~0) (< main_~b~0 7) (< main_~a~0 6) (< main_~c~0 7)) [2021-05-02 13:33:38,906 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 01:33:38 BoogieIcfgContainer [2021-05-02 13:33:38,906 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 13:33:38,906 INFO L168 Benchmark]: Toolchain (without parser) took 7032.10 ms. Allocated memory was 191.9 MB in the beginning and 276.8 MB in the end (delta: 84.9 MB). Free memory was 155.1 MB in the beginning and 195.1 MB in the end (delta: -40.0 MB). Peak memory consumption was 144.0 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:38,906 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 191.9 MB. Free memory was 171.4 MB in the beginning and 171.3 MB in the end (delta: 86.0 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 13:33:38,907 INFO L168 Benchmark]: CACSL2BoogieTranslator took 190.39 ms. Allocated memory is still 191.9 MB. Free memory was 154.9 MB in the beginning and 145.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:38,907 INFO L168 Benchmark]: Boogie Preprocessor took 68.44 ms. Allocated memory is still 191.9 MB. Free memory was 145.4 MB in the beginning and 174.0 MB in the end (delta: -28.6 MB). Peak memory consumption was 2.4 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:38,907 INFO L168 Benchmark]: RCFGBuilder took 229.73 ms. Allocated memory is still 191.9 MB. Free memory was 174.0 MB in the beginning and 160.0 MB in the end (delta: 14.0 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:38,907 INFO L168 Benchmark]: TraceAbstraction took 6538.21 ms. Allocated memory was 191.9 MB in the beginning and 276.8 MB in the end (delta: 84.9 MB). Free memory was 159.5 MB in the beginning and 195.1 MB in the end (delta: -35.6 MB). Peak memory consumption was 147.8 MB. Max. memory is 8.0 GB. [2021-05-02 13:33:38,907 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 191.9 MB. Free memory was 171.4 MB in the beginning and 171.3 MB in the end (delta: 86.0 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 190.39 ms. Allocated memory is still 191.9 MB. Free memory was 154.9 MB in the beginning and 145.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 68.44 ms. Allocated memory is still 191.9 MB. Free memory was 145.4 MB in the beginning and 174.0 MB in the end (delta: -28.6 MB). Peak memory consumption was 2.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 229.73 ms. Allocated memory is still 191.9 MB. Free memory was 174.0 MB in the beginning and 160.0 MB in the end (delta: 14.0 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6538.21 ms. Allocated memory was 191.9 MB in the beginning and 276.8 MB in the end (delta: 84.9 MB). Free memory was 159.5 MB in the beginning and 195.1 MB in the end (delta: -35.6 MB). Peak memory consumption was 147.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 29]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6159.9ms, OverallIterations: 13, TraceHistogramMax: 48, EmptinessCheckTime: 16.6ms, AutomataDifference: 1535.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 313.7ms, InitialAbstractionConstructionTime: 20.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 179 SDtfs, 335 SDslu, 165 SDs, 0 SdLazy, 463 SolverSat, 82 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 408.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 681 GetRequests, 573 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1290.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=136occurred in iteration=12, InterpolantAutomatonStates: 85, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 117.8ms AutomataMinimizationTime, 13 MinimizatonAttempts, 105 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 76 NumberOfFragments, 73 HoareAnnotationTreeSize, 7 FomulaSimplifications, 84114 FormulaSimplificationTreeSizeReduction, 203.3ms HoareSimplificationTime, 7 FomulaSimplificationsInter, 264 FormulaSimplificationTreeSizeReductionInter, 103.9ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 106.5ms SsaConstructionTime, 353.3ms SatisfiabilityAnalysisTime, 1776.6ms InterpolantComputationTime, 1161 NumberOfCodeBlocks, 1048 NumberOfCodeBlocksAsserted, 72 NumberOfCheckSat, 1139 ConstructedInterpolants, 0 QuantifiedInterpolants, 2447 SizeOfPredicates, 3 NumberOfNonLiveVariables, 1250 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 22 InterpolantComputations, 5 PerfectInterpolantSequences, 10774/12115 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: (((6 <= c && a < 7) && b < 7) && 6 <= b) && c < 7 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: ((6 <= c && b < 7) && a < 6) && c < 7 - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: (b < 6 && a < 6) && c < 7 RESULT: Ultimate proved your program to be correct! Received shutdown request...