/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_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 07:03:03,820 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 07:03:03,823 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 07:03:03,860 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 07:03:03,861 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 07:03:03,862 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 07:03:03,864 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 07:03:03,866 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 07:03:03,868 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 07:03:03,869 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 07:03:03,871 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 07:03:03,872 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 07:03:03,873 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 07:03:03,874 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 07:03:03,875 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 07:03:03,877 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 07:03:03,878 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 07:03:03,879 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 07:03:03,899 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 07:03:03,901 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 07:03:03,903 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 07:03:03,904 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 07:03:03,906 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 07:03:03,907 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 07:03:03,910 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 07:03:03,914 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-22 07:03:03,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-22 07:03:03,915 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-22 07:03:03,916 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-22 07:03:03,918 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-22 07:03:03,918 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-22 07:03:03,919 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-22 07:03:03,919 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-22 07:03:03,920 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 07:03:03,921 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 07:03:03,921 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 07:03:03,922 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 07:03:03,950 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 07:03:03,950 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 07:03:03,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 07:03:03,952 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 07:03:03,952 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 07:03:03,952 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 07:03:03,953 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 07:03:03,953 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 07:03:03,953 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 07:03:03,953 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 07:03:03,954 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 07:03:03,954 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 07:03:03,954 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 07:03:03,954 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 07:03:03,955 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 07:03:03,955 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 07:03:03,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 07:03:03,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:03:03,956 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 07:03:03,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 07:03:03,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 07:03:03,957 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 07:03:03,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 07:03:03,957 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 07:03:03,957 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 07:03:03,958 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 07:03:04,357 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 07:03:04,383 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 07:03:04,387 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 07:03:04,388 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 07:03:04,389 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 07:03:04,390 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_b3_o2.c [2020-12-22 07:03:04,485 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce7f0e9a3/c565266b0fca42ee97d3d220550a1a64/FLAG8757648b1 [2020-12-22 07:03:05,068 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 07:03:05,068 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o2.c [2020-12-22 07:03:05,075 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce7f0e9a3/c565266b0fca42ee97d3d220550a1a64/FLAG8757648b1 [2020-12-22 07:03:05,457 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce7f0e9a3/c565266b0fca42ee97d3d220550a1a64 [2020-12-22 07:03:05,463 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 07:03:05,466 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 07:03:05,468 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:05,468 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 07:03:05,473 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 07:03:05,473 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,475 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6503d6f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05, skipping insertion in model container [2020-12-22 07:03:05,476 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,484 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 07:03:05,502 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 07:03:05,651 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o2.c[771,784] [2020-12-22 07:03:05,655 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:05,666 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 07:03:05,685 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o2.c[771,784] [2020-12-22 07:03:05,686 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:05,703 INFO L208 MainTranslator]: Completed translation [2020-12-22 07:03:05,704 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05 WrapperNode [2020-12-22 07:03:05,704 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:05,705 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:05,705 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 07:03:05,706 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 07:03:05,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,722 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,741 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:05,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 07:03:05,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 07:03:05,742 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 07:03:05,751 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,751 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,753 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,757 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,759 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,760 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (1/1) ... [2020-12-22 07:03:05,761 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 07:03:05,762 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 07:03:05,763 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 07:03:05,763 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 07:03:05,764 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (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 [2020-12-22 07:03:05,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 07:03:05,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 07:03:05,883 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-12-22 07:03:05,884 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-12-22 07:03:05,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 07:03:05,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 07:03:05,885 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-22 07:03:05,886 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-22 07:03:06,223 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 07:03:06,224 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 07:03:06,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:06 BoogieIcfgContainer [2020-12-22 07:03:06,226 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 07:03:06,230 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 07:03:06,231 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 07:03:06,239 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 07:03:06,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 07:03:05" (1/3) ... [2020-12-22 07:03:06,241 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a384746 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:06, skipping insertion in model container [2020-12-22 07:03:06,241 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:05" (2/3) ... [2020-12-22 07:03:06,242 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a384746 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:06, skipping insertion in model container [2020-12-22 07:03:06,242 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:06" (3/3) ... [2020-12-22 07:03:06,247 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-12-22 07:03:06,265 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 07:03:06,270 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 07:03:06,292 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 07:03:06,361 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 07:03:06,363 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 07:03:06,364 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 07:03:06,364 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 07:03:06,364 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 07:03:06,364 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 07:03:06,364 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 07:03:06,364 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 07:03:06,413 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-12-22 07:03:06,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 07:03:06,427 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:06,428 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:06,429 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:06,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:06,435 INFO L82 PathProgramCache]: Analyzing trace with hash 794002500, now seen corresponding path program 1 times [2020-12-22 07:03:06,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:06,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509531660] [2020-12-22 07:03:06,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:06,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:06,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:06,724 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509531660] [2020-12-22 07:03:06,725 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:06,725 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:06,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29837242] [2020-12-22 07:03:06,731 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:06,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:06,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:06,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:06,749 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-12-22 07:03:06,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:06,816 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-12-22 07:03:06,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:06,818 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 07:03:06,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:06,828 INFO L225 Difference]: With dead ends: 36 [2020-12-22 07:03:06,828 INFO L226 Difference]: Without dead ends: 23 [2020-12-22 07:03:06,831 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:06,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-22 07:03:06,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-22 07:03:06,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-22 07:03:06,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-12-22 07:03:06,875 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2020-12-22 07:03:06,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:06,876 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-12-22 07:03:06,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:06,876 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-12-22 07:03:06,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 07:03:06,878 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:06,878 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:06,878 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 07:03:06,879 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:06,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:06,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1040166181, now seen corresponding path program 1 times [2020-12-22 07:03:06,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:06,880 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896510215] [2020-12-22 07:03:06,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:06,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:06,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:07,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896510215] [2020-12-22 07:03:07,070 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:07,070 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:07,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330006823] [2020-12-22 07:03:07,072 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:07,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:07,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:07,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:07,077 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 5 states. [2020-12-22 07:03:07,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:07,119 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2020-12-22 07:03:07,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:07,121 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-22 07:03:07,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:07,123 INFO L225 Difference]: With dead ends: 41 [2020-12-22 07:03:07,124 INFO L226 Difference]: Without dead ends: 29 [2020-12-22 07:03:07,125 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:07,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-22 07:03:07,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-12-22 07:03:07,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-22 07:03:07,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-12-22 07:03:07,140 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2020-12-22 07:03:07,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:07,140 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-12-22 07:03:07,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:07,141 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-12-22 07:03:07,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 07:03:07,143 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:07,143 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:07,144 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 07:03:07,145 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:07,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:07,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1068795332, now seen corresponding path program 1 times [2020-12-22 07:03:07,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:07,148 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477073490] [2020-12-22 07:03:07,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:07,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:07,347 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477073490] [2020-12-22 07:03:07,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:07,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 07:03:07,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937746573] [2020-12-22 07:03:07,348 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 07:03:07,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:07,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 07:03:07,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-12-22 07:03:07,350 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 8 states. [2020-12-22 07:03:07,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:07,399 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-12-22 07:03:07,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:07,399 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-12-22 07:03:07,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:07,401 INFO L225 Difference]: With dead ends: 33 [2020-12-22 07:03:07,401 INFO L226 Difference]: Without dead ends: 29 [2020-12-22 07:03:07,402 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:03:07,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-22 07:03:07,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-12-22 07:03:07,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-22 07:03:07,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-12-22 07:03:07,408 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2020-12-22 07:03:07,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:07,409 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-12-22 07:03:07,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 07:03:07,409 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-12-22 07:03:07,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:07,410 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:07,411 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, 1, 1] [2020-12-22 07:03:07,411 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-22 07:03:07,411 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:07,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:07,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1632008158, now seen corresponding path program 1 times [2020-12-22 07:03:07,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:07,412 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276265535] [2020-12-22 07:03:07,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,547 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:07,547 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276265535] [2020-12-22 07:03:07,548 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:07,548 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:07,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370960306] [2020-12-22 07:03:07,549 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:07,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:07,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:07,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:07,550 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-12-22 07:03:07,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:07,572 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2020-12-22 07:03:07,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:07,574 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-12-22 07:03:07,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:07,576 INFO L225 Difference]: With dead ends: 45 [2020-12-22 07:03:07,576 INFO L226 Difference]: Without dead ends: 33 [2020-12-22 07:03:07,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:07,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-22 07:03:07,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-12-22 07:03:07,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-22 07:03:07,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-12-22 07:03:07,593 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2020-12-22 07:03:07,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:07,595 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-12-22 07:03:07,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:07,595 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-12-22 07:03:07,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:07,596 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:07,596 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, 1, 1] [2020-12-22 07:03:07,597 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-22 07:03:07,597 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:07,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:07,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1435494653, now seen corresponding path program 1 times [2020-12-22 07:03:07,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:07,600 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470885459] [2020-12-22 07:03:07,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:07,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:07,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:07,841 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470885459] [2020-12-22 07:03:07,842 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:07,842 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 07:03:07,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128477534] [2020-12-22 07:03:07,843 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 07:03:07,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:07,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 07:03:07,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-12-22 07:03:07,849 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-12-22 07:03:07,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:07,976 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2020-12-22 07:03:07,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:07,978 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-12-22 07:03:07,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:07,982 INFO L225 Difference]: With dead ends: 49 [2020-12-22 07:03:07,982 INFO L226 Difference]: Without dead ends: 37 [2020-12-22 07:03:07,983 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:03:07,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-22 07:03:07,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-12-22 07:03:07,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-22 07:03:07,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-12-22 07:03:07,996 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 24 [2020-12-22 07:03:07,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:07,996 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-12-22 07:03:07,996 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 07:03:07,997 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-12-22 07:03:07,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:07,998 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:08,001 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, 1, 1] [2020-12-22 07:03:08,001 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-22 07:03:08,002 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:08,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:08,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1464123804, now seen corresponding path program 1 times [2020-12-22 07:03:08,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:08,003 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147354329] [2020-12-22 07:03:08,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:08,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:08,041 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:08,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:08,076 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:08,106 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 07:03:08,106 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 07:03:08,107 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-12-22 07:03:08,148 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 07:03:08 BoogieIcfgContainer [2020-12-22 07:03:08,148 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 07:03:08,149 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 07:03:08,149 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 07:03:08,149 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 07:03:08,150 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:06" (3/4) ... [2020-12-22 07:03:08,152 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 07:03:08,206 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/id2_b3_o2.c-witness.graphml [2020-12-22 07:03:08,206 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 07:03:08,208 INFO L168 Benchmark]: Toolchain (without parser) took 2741.91 ms. Allocated memory was 161.5 MB in the beginning and 221.2 MB in the end (delta: 59.8 MB). Free memory was 137.2 MB in the beginning and 188.9 MB in the end (delta: -51.8 MB). Peak memory consumption was 8.2 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,209 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 161.5 MB. Free memory is still 133.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 07:03:08,210 INFO L168 Benchmark]: CACSL2BoogieTranslator took 236.40 ms. Allocated memory is still 161.5 MB. Free memory was 137.0 MB in the beginning and 127.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,210 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.99 ms. Allocated memory is still 161.5 MB. Free memory was 127.1 MB in the beginning and 125.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,211 INFO L168 Benchmark]: Boogie Preprocessor took 19.84 ms. Allocated memory is still 161.5 MB. Free memory was 125.9 MB in the beginning and 125.0 MB in the end (delta: 842.4 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,212 INFO L168 Benchmark]: RCFGBuilder took 463.41 ms. Allocated memory is still 161.5 MB. Free memory was 124.8 MB in the beginning and 112.5 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,213 INFO L168 Benchmark]: TraceAbstraction took 1917.62 ms. Allocated memory was 161.5 MB in the beginning and 221.2 MB in the end (delta: 59.8 MB). Free memory was 112.0 MB in the beginning and 191.0 MB in the end (delta: -79.0 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 07:03:08,213 INFO L168 Benchmark]: Witness Printer took 57.71 ms. Allocated memory is still 221.2 MB. Free memory was 191.0 MB in the beginning and 188.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,217 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 161.5 MB. Free memory is still 133.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 236.40 ms. Allocated memory is still 161.5 MB. Free memory was 137.0 MB in the beginning and 127.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 35.99 ms. Allocated memory is still 161.5 MB. Free memory was 127.1 MB in the beginning and 125.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 19.84 ms. Allocated memory is still 161.5 MB. Free memory was 125.9 MB in the beginning and 125.0 MB in the end (delta: 842.4 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 463.41 ms. Allocated memory is still 161.5 MB. Free memory was 124.8 MB in the beginning and 112.5 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1917.62 ms. Allocated memory was 161.5 MB in the beginning and 221.2 MB in the end (delta: 59.8 MB). Free memory was 112.0 MB in the beginning and 191.0 MB in the end (delta: -79.0 MB). There was no memory consumed. Max. memory is 8.0 GB. * Witness Printer took 57.71 ms. Allocated memory is still 221.2 MB. Free memory was 191.0 MB in the beginning and 188.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L24] unsigned int input = __VERIFIER_nondet_uint(); [L25] CALL, EXPR id(input) VAL [\old(x)=2] [L10] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L17] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L18] CALL, EXPR id(x-1) VAL [\old(x)=0] [L10] COND TRUE x==0 [L10] return 0; VAL [\old(x)=0, \result=0, x=0] [L18] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L18] unsigned int ret = id(x-1) + 1; [L19] COND FALSE !(ret > 3) [L20] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L11] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L11] unsigned int ret = id2(x-1) + 1; [L12] COND FALSE !(ret > 3) [L13] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L25] RET, EXPR id(input) [L25] unsigned int result = id(input); [L26] COND TRUE result == 2 [L27] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 127 SDtfs, 13 SDslu, 492 SDs, 0 SdLazy, 99 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=5, 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, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 116 NumberOfCodeBlocks, 116 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 87 ConstructedInterpolants, 0 QuantifiedInterpolants, 4915 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...