/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive-simple/id2_i5_o5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 19:20:11,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 19:20:11,953 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 19:20:12,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 19:20:12,013 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 19:20:12,019 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 19:20:12,023 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 19:20:12,029 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 19:20:12,033 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 19:20:12,035 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 19:20:12,039 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 19:20:12,044 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 19:20:12,044 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 19:20:12,045 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 19:20:12,047 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 19:20:12,048 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 19:20:12,049 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 19:20:12,050 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 19:20:12,053 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 19:20:12,055 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 19:20:12,057 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 19:20:12,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 19:20:12,061 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 19:20:12,062 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 19:20:12,065 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 19:20:12,070 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 19:20:12,072 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 19:20:12,073 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 19:20:12,074 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 19:20:12,075 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 19:20:12,076 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 19:20:12,076 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 19:20:12,077 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 19:20:12,077 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 19:20:12,078 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 19:20:12,079 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 19:20:12,081 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 19:20:12,109 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 19:20:12,109 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 19:20:12,111 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 19:20:12,112 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 19:20:12,112 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 19:20:12,112 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 19:20:12,113 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 19:20:12,113 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 19:20:12,113 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 19:20:12,114 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 19:20:12,114 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 19:20:12,114 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 19:20:12,114 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 19:20:12,115 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 19:20:12,115 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 19:20:12,115 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 19:20:12,116 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 19:20:12,116 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 19:20:12,116 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 19:20:12,116 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 19:20:12,117 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 19:20:12,117 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 19:20:12,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 19:20:12,117 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 19:20:12,117 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 19:20:12,118 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 19:20:12,511 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 19:20:12,547 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 19:20:12,551 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 19:20:12,552 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 19:20:12,553 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 19:20:12,554 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_i5_o5-2.c [2021-01-06 19:20:12,640 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/f3bfddbfe/33b722ff85df4c4ab552f113ede68037/FLAGf2315bf4c [2021-01-06 19:20:13,233 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 19:20:13,233 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-2.c [2021-01-06 19:20:13,240 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/f3bfddbfe/33b722ff85df4c4ab552f113ede68037/FLAGf2315bf4c [2021-01-06 19:20:13,626 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/f3bfddbfe/33b722ff85df4c4ab552f113ede68037 [2021-01-06 19:20:13,634 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 19:20:13,637 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 19:20:13,638 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 19:20:13,639 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 19:20:13,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 19:20:13,643 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,645 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f132f9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13, skipping insertion in model container [2021-01-06 19:20:13,645 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,654 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 19:20:13,668 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 19:20:13,815 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-2.c[548,561] [2021-01-06 19:20:13,825 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 19:20:13,842 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 19:20:13,865 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-2.c[548,561] [2021-01-06 19:20:13,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 19:20:13,893 INFO L208 MainTranslator]: Completed translation [2021-01-06 19:20:13,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13 WrapperNode [2021-01-06 19:20:13,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 19:20:13,895 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 19:20:13,895 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 19:20:13,896 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 19:20:13,906 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,917 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,937 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 19:20:13,942 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 19:20:13,942 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 19:20:13,943 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 19:20:13,956 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,956 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,958 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,958 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,962 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,965 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,966 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... [2021-01-06 19:20:13,968 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 19:20:13,969 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 19:20:13,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 19:20:13,969 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 19:20:13,971 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:14,098 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 19:20:14,099 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 19:20:14,099 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2021-01-06 19:20:14,099 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2021-01-06 19:20:14,100 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 19:20:14,100 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 19:20:14,100 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-01-06 19:20:14,100 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-01-06 19:20:14,459 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 19:20:14,461 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-01-06 19:20:14,463 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 07:20:14 BoogieIcfgContainer [2021-01-06 19:20:14,464 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 19:20:14,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 19:20:14,470 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 19:20:14,474 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 19:20:14,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 07:20:13" (1/3) ... [2021-01-06 19:20:14,476 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ddddaf7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 07:20:14, skipping insertion in model container [2021-01-06 19:20:14,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:13" (2/3) ... [2021-01-06 19:20:14,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ddddaf7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 07:20:14, skipping insertion in model container [2021-01-06 19:20:14,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 07:20:14" (3/3) ... [2021-01-06 19:20:14,479 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-2.c [2021-01-06 19:20:14,491 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 19:20:14,497 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 19:20:14,519 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 19:20:14,568 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 19:20:14,569 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 19:20:14,569 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 19:20:14,569 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 19:20:14,569 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 19:20:14,569 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 19:20:14,570 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 19:20:14,570 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 19:20:14,594 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2021-01-06 19:20:14,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 19:20:14,602 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:14,603 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:14,604 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:14,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:14,612 INFO L82 PathProgramCache]: Analyzing trace with hash -214835512, now seen corresponding path program 1 times [2021-01-06 19:20:14,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:14,626 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392345932] [2021-01-06 19:20:14,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:14,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:14,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:14,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:14,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 19:20:14,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392345932] [2021-01-06 19:20:14,935 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:14,935 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-01-06 19:20:14,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033850597] [2021-01-06 19:20:14,942 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:14,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:14,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:14,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:14,962 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2021-01-06 19:20:15,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:15,066 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-01-06 19:20:15,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:15,069 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2021-01-06 19:20:15,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:15,080 INFO L225 Difference]: With dead ends: 31 [2021-01-06 19:20:15,080 INFO L226 Difference]: Without dead ends: 21 [2021-01-06 19:20:15,084 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-01-06 19:20:15,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-01-06 19:20:15,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-01-06 19:20:15,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-01-06 19:20:15,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-01-06 19:20:15,133 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2021-01-06 19:20:15,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:15,134 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-01-06 19:20:15,134 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:15,134 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-01-06 19:20:15,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 19:20:15,136 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:15,137 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:15,137 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 19:20:15,137 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:15,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:15,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1901198062, now seen corresponding path program 1 times [2021-01-06 19:20:15,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:15,139 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301070701] [2021-01-06 19:20:15,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:15,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:15,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:15,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 19:20:15,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301070701] [2021-01-06 19:20:15,332 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:15,332 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-01-06 19:20:15,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252925607] [2021-01-06 19:20:15,334 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 19:20:15,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:15,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 19:20:15,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-01-06 19:20:15,336 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2021-01-06 19:20:15,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:15,476 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-01-06 19:20:15,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 19:20:15,477 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2021-01-06 19:20:15,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:15,479 INFO L225 Difference]: With dead ends: 30 [2021-01-06 19:20:15,479 INFO L226 Difference]: Without dead ends: 26 [2021-01-06 19:20:15,485 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-01-06 19:20:15,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-01-06 19:20:15,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2021-01-06 19:20:15,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-01-06 19:20:15,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-01-06 19:20:15,496 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 16 [2021-01-06 19:20:15,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:15,497 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-01-06 19:20:15,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 19:20:15,497 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-01-06 19:20:15,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-01-06 19:20:15,502 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:15,502 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:15,502 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 19:20:15,503 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:15,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:15,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1593669520, now seen corresponding path program 1 times [2021-01-06 19:20:15,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:15,506 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424485060] [2021-01-06 19:20:15,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:15,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:15,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:15,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,704 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 19:20:15,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424485060] [2021-01-06 19:20:15,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491523234] [2021-01-06 19:20:15,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:15,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:15,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 19:20:15,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:16,111 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 19:20:16,112 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:16,112 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-01-06 19:20:16,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899203092] [2021-01-06 19:20:16,113 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 19:20:16,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:16,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 19:20:16,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-01-06 19:20:16,116 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 11 states. [2021-01-06 19:20:16,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:16,359 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-01-06 19:20:16,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 19:20:16,361 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2021-01-06 19:20:16,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:16,367 INFO L225 Difference]: With dead ends: 36 [2021-01-06 19:20:16,368 INFO L226 Difference]: Without dead ends: 32 [2021-01-06 19:20:16,371 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-01-06 19:20:16,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-01-06 19:20:16,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2021-01-06 19:20:16,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-01-06 19:20:16,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-01-06 19:20:16,396 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2021-01-06 19:20:16,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:16,398 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-01-06 19:20:16,398 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 19:20:16,398 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-01-06 19:20:16,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-01-06 19:20:16,401 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:16,402 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:16,615 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-01-06 19:20:16,616 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:16,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:16,618 INFO L82 PathProgramCache]: Analyzing trace with hash 545848374, now seen corresponding path program 1 times [2021-01-06 19:20:16,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:16,619 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114131523] [2021-01-06 19:20:16,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:16,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:16,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:16,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:16,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:16,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:16,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:16,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:16,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:16,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:16,863 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 19:20:16,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114131523] [2021-01-06 19:20:16,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887860285] [2021-01-06 19:20:16,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:16,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:16,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 19:20:16,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:17,134 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 19:20:17,134 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:17,135 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-01-06 19:20:17,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787759489] [2021-01-06 19:20:17,136 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 19:20:17,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:17,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 19:20:17,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-01-06 19:20:17,137 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2021-01-06 19:20:17,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:17,295 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-01-06 19:20:17,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 19:20:17,296 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2021-01-06 19:20:17,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:17,298 INFO L225 Difference]: With dead ends: 42 [2021-01-06 19:20:17,298 INFO L226 Difference]: Without dead ends: 38 [2021-01-06 19:20:17,299 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-01-06 19:20:17,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-01-06 19:20:17,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-01-06 19:20:17,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-01-06 19:20:17,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-01-06 19:20:17,306 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2021-01-06 19:20:17,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:17,307 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-01-06 19:20:17,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 19:20:17,307 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-01-06 19:20:17,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-01-06 19:20:17,308 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:17,309 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:17,522 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:17,522 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:17,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:17,524 INFO L82 PathProgramCache]: Analyzing trace with hash 120771672, now seen corresponding path program 2 times [2021-01-06 19:20:17,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:17,526 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580942112] [2021-01-06 19:20:17,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:17,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:17,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:17,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:17,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:17,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:17,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:17,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:17,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:17,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:17,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:17,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:17,861 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 19:20:17,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580942112] [2021-01-06 19:20:17,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443066161] [2021-01-06 19:20:17,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:17,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 19:20:17,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 19:20:17,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 19:20:17,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:18,140 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 19:20:18,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:18,141 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2021-01-06 19:20:18,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135953545] [2021-01-06 19:20:18,142 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 19:20:18,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:18,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 19:20:18,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-01-06 19:20:18,143 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2021-01-06 19:20:18,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:18,336 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-01-06 19:20:18,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 19:20:18,337 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2021-01-06 19:20:18,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:18,338 INFO L225 Difference]: With dead ends: 48 [2021-01-06 19:20:18,339 INFO L226 Difference]: Without dead ends: 44 [2021-01-06 19:20:18,339 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-01-06 19:20:18,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-01-06 19:20:18,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 33. [2021-01-06 19:20:18,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-01-06 19:20:18,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-01-06 19:20:18,346 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 34 [2021-01-06 19:20:18,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:18,347 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-01-06 19:20:18,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 19:20:18,347 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-01-06 19:20:18,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-01-06 19:20:18,348 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:18,348 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:18,561 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:18,562 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:18,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:18,564 INFO L82 PathProgramCache]: Analyzing trace with hash -644488834, now seen corresponding path program 2 times [2021-01-06 19:20:18,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:18,564 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376392186] [2021-01-06 19:20:18,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:18,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:18,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:18,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:18,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:18,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:18,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:18,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:18,913 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 19:20:18,914 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376392186] [2021-01-06 19:20:18,915 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414564219] [2021-01-06 19:20:18,915 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:18,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 19:20:18,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 19:20:18,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 19:20:18,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:19,097 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 19:20:19,098 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:19,098 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2021-01-06 19:20:19,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574278685] [2021-01-06 19:20:19,099 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 19:20:19,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:19,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 19:20:19,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-01-06 19:20:19,100 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2021-01-06 19:20:19,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:19,195 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-01-06 19:20:19,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 19:20:19,196 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2021-01-06 19:20:19,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:19,198 INFO L225 Difference]: With dead ends: 54 [2021-01-06 19:20:19,198 INFO L226 Difference]: Without dead ends: 50 [2021-01-06 19:20:19,199 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-01-06 19:20:19,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-01-06 19:20:19,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2021-01-06 19:20:19,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-01-06 19:20:19,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-01-06 19:20:19,206 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 40 [2021-01-06 19:20:19,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:19,207 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-01-06 19:20:19,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 19:20:19,207 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-01-06 19:20:19,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-01-06 19:20:19,208 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:19,208 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:19,422 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:19,423 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:19,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:19,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1812460832, now seen corresponding path program 3 times [2021-01-06 19:20:19,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:19,425 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402722721] [2021-01-06 19:20:19,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:19,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:19,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:19,638 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-01-06 19:20:19,638 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402722721] [2021-01-06 19:20:19,639 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85919336] [2021-01-06 19:20:19,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:19,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-01-06 19:20:19,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 19:20:19,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 19:20:19,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:19,842 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-01-06 19:20:19,842 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 19:20:19,843 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [12] total 15 [2021-01-06 19:20:19,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701742479] [2021-01-06 19:20:19,843 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 19:20:19,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:19,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 19:20:19,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-01-06 19:20:19,845 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 12 states. [2021-01-06 19:20:20,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:20,014 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-01-06 19:20:20,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 19:20:20,015 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2021-01-06 19:20:20,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:20,017 INFO L225 Difference]: With dead ends: 60 [2021-01-06 19:20:20,017 INFO L226 Difference]: Without dead ends: 36 [2021-01-06 19:20:20,019 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-01-06 19:20:20,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-01-06 19:20:20,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-01-06 19:20:20,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-01-06 19:20:20,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-01-06 19:20:20,027 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 46 [2021-01-06 19:20:20,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:20,027 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-01-06 19:20:20,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 19:20:20,027 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-01-06 19:20:20,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-01-06 19:20:20,029 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:20,029 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:20,239 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-01-06 19:20:20,240 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:20,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:20,241 INFO L82 PathProgramCache]: Analyzing trace with hash -866735418, now seen corresponding path program 3 times [2021-01-06 19:20:20,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:20,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466911017] [2021-01-06 19:20:20,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:20,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:20,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:20,551 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 27 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-01-06 19:20:20,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466911017] [2021-01-06 19:20:20,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851149916] [2021-01-06 19:20:20,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:20,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-01-06 19:20:20,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 19:20:20,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2021-01-06 19:20:20,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:20,749 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-01-06 19:20:20,750 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 19:20:20,750 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [13] total 16 [2021-01-06 19:20:20,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960200952] [2021-01-06 19:20:20,752 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 19:20:20,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:20,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 19:20:20,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-01-06 19:20:20,753 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 13 states. [2021-01-06 19:20:20,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:20,931 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2021-01-06 19:20:20,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 19:20:20,932 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2021-01-06 19:20:20,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:20,933 INFO L225 Difference]: With dead ends: 36 [2021-01-06 19:20:20,933 INFO L226 Difference]: Without dead ends: 0 [2021-01-06 19:20:20,934 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-01-06 19:20:20,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-01-06 19:20:20,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-01-06 19:20:20,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-01-06 19:20:20,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-01-06 19:20:20,935 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 52 [2021-01-06 19:20:20,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:20,935 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-01-06 19:20:20,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 19:20:20,935 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-01-06 19:20:20,935 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-01-06 19:20:21,148 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:21,153 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-01-06 19:20:21,180 INFO L185 CegarLoopUtils]: At program point L16(line 16) the Hoare annotation is: (= id2_~x |id2_#in~x|) [2021-01-06 19:20:21,180 INFO L189 CegarLoopUtils]: For program point L15(line 15) no Hoare annotation was computed. [2021-01-06 19:20:21,180 INFO L189 CegarLoopUtils]: For program point L16-1(line 16) no Hoare annotation was computed. [2021-01-06 19:20:21,180 INFO L189 CegarLoopUtils]: For program point id2EXIT(lines 14 17) no Hoare annotation was computed. [2021-01-06 19:20:21,180 INFO L192 CegarLoopUtils]: At program point id2ENTRY(lines 14 17) the Hoare annotation is: true [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point id2FINAL(lines 14 17) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 23) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point L23(line 23) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L189 CegarLoopUtils]: For program point L22(lines 22 24) no Hoare annotation was computed. [2021-01-06 19:20:21,181 INFO L185 CegarLoopUtils]: At program point L21(line 21) the Hoare annotation is: (and (<= 5 ULTIMATE.start_main_~input~0) (<= ULTIMATE.start_main_~input~0 5)) [2021-01-06 19:20:21,182 INFO L189 CegarLoopUtils]: For program point L21-1(line 21) no Hoare annotation was computed. [2021-01-06 19:20:21,182 INFO L189 CegarLoopUtils]: For program point L19(lines 19 25) no Hoare annotation was computed. [2021-01-06 19:20:21,182 INFO L189 CegarLoopUtils]: For program point idFINAL(lines 9 12) no Hoare annotation was computed. [2021-01-06 19:20:21,182 INFO L185 CegarLoopUtils]: At program point L11(line 11) the Hoare annotation is: (= |id_#in~x| id_~x) [2021-01-06 19:20:21,182 INFO L189 CegarLoopUtils]: For program point idEXIT(lines 9 12) no Hoare annotation was computed. [2021-01-06 19:20:21,182 INFO L189 CegarLoopUtils]: For program point L10(line 10) no Hoare annotation was computed. [2021-01-06 19:20:21,182 INFO L189 CegarLoopUtils]: For program point L11-1(line 11) no Hoare annotation was computed. [2021-01-06 19:20:21,182 INFO L192 CegarLoopUtils]: At program point idENTRY(lines 9 12) the Hoare annotation is: true [2021-01-06 19:20:21,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.01 07:20:21 BoogieIcfgContainer [2021-01-06 19:20:21,188 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-01-06 19:20:21,188 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-01-06 19:20:21,188 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-01-06 19:20:21,188 INFO L275 PluginConnector]: Witness Printer initialized [2021-01-06 19:20:21,189 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 07:20:14" (3/4) ... [2021-01-06 19:20:21,192 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-01-06 19:20:21,199 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id2 [2021-01-06 19:20:21,200 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2021-01-06 19:20:21,204 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-01-06 19:20:21,205 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-01-06 19:20:21,205 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-01-06 19:20:21,205 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-01-06 19:20:21,245 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/id2_i5_o5-2.c-witness.graphml [2021-01-06 19:20:21,245 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-01-06 19:20:21,248 INFO L168 Benchmark]: Toolchain (without parser) took 7610.32 ms. Allocated memory was 152.0 MB in the beginning and 182.5 MB in the end (delta: 30.4 MB). Free memory was 126.8 MB in the beginning and 70.8 MB in the end (delta: 56.0 MB). Peak memory consumption was 87.1 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:21,248 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 152.0 MB. Free memory is still 134.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 19:20:21,249 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.67 ms. Allocated memory is still 152.0 MB. Free memory was 126.6 MB in the beginning and 117.2 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:21,249 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.79 ms. Allocated memory is still 152.0 MB. Free memory was 117.2 MB in the beginning and 115.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:21,250 INFO L168 Benchmark]: Boogie Preprocessor took 26.12 ms. Allocated memory is still 152.0 MB. Free memory was 115.8 MB in the beginning and 115.0 MB in the end (delta: 877.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 19:20:21,250 INFO L168 Benchmark]: RCFGBuilder took 495.09 ms. Allocated memory is still 152.0 MB. Free memory was 115.0 MB in the beginning and 130.7 MB in the end (delta: -15.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:21,251 INFO L168 Benchmark]: TraceAbstraction took 6718.39 ms. Allocated memory was 152.0 MB in the beginning and 182.5 MB in the end (delta: 30.4 MB). Free memory was 130.7 MB in the beginning and 73.4 MB in the end (delta: 57.3 MB). Peak memory consumption was 88.2 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:21,252 INFO L168 Benchmark]: Witness Printer took 57.21 ms. Allocated memory is still 182.5 MB. Free memory was 73.4 MB in the beginning and 70.8 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:21,255 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 152.0 MB. Free memory is still 134.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 255.67 ms. Allocated memory is still 152.0 MB. Free memory was 126.6 MB in the beginning and 117.2 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 44.79 ms. Allocated memory is still 152.0 MB. Free memory was 117.2 MB in the beginning and 115.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 26.12 ms. Allocated memory is still 152.0 MB. Free memory was 115.8 MB in the beginning and 115.0 MB in the end (delta: 877.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 495.09 ms. Allocated memory is still 152.0 MB. Free memory was 115.0 MB in the beginning and 130.7 MB in the end (delta: -15.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6718.39 ms. Allocated memory was 152.0 MB in the beginning and 182.5 MB in the end (delta: 30.4 MB). Free memory was 130.7 MB in the beginning and 73.4 MB in the end (delta: 57.3 MB). Peak memory consumption was 88.2 MB. Max. memory is 8.0 GB. * Witness Printer took 57.21 ms. Allocated memory is still 182.5 MB. Free memory was 73.4 MB in the beginning and 70.8 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 23]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.5s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 115 SDslu, 899 SDs, 0 SdLazy, 491 SolverSat, 22 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 384 GetRequests, 272 SyntacticMatches, 4 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 40 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 7 PreInvPairs, 7 NumberOfFragments, 15 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 5 FomulaSimplificationsInter, 8 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.8s InterpolantComputationTime, 470 NumberOfCodeBlocks, 470 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 456 ConstructedInterpolants, 0 QuantifiedInterpolants, 46512 SizeOfPredicates, 33 NumberOfNonLiveVariables, 690 ConjunctsInSsa, 91 ConjunctsInUnsatCore, 14 InterpolantComputations, 4 PerfectInterpolantSequences, 282/360 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...