/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:48:09,127 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:48:09,131 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:48:09,167 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:48:09,168 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:48:09,176 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:48:09,179 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:48:09,182 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:48:09,185 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:48:09,188 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:48:09,189 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:48:09,190 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:48:09,190 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:48:09,193 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:48:09,195 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:48:09,197 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:48:09,198 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:48:09,199 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:48:09,201 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:48:09,209 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:48:09,212 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:48:09,213 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:48:09,214 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:48:09,214 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:48:09,226 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 06:48:09,227 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 06:48:09,227 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 06:48:09,234 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 06:48:09,235 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 06:48:09,235 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 06:48:09,236 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 06:48:09,236 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 06:48:09,239 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 06:48:09,240 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 06:48:09,240 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 06:48:09,241 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 06:48:09,241 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 06:48:09,241 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 06:48:09,241 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:48:09,243 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:48:09,244 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:48:09,244 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 06:48:09,286 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:48:09,286 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:48:09,289 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:48:09,289 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:48:09,289 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:48:09,289 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:48:09,290 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:48:09,290 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:48:09,290 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:48:09,290 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:48:09,291 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:48:09,292 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:48:09,292 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:48:09,292 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:48:09,293 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:48:09,293 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:48:09,293 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:48:09,293 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:48:09,293 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:48:09,293 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:48:09,294 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:48:09,294 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:48:09,294 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:48:09,294 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:48:09,294 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:48:09,295 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:48:09,295 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:48:09,295 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:48:09,295 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:48:09,295 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:48:09,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:48:09,640 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:48:09,644 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:48:09,645 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:48:09,646 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:48:09,647 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-08-19 06:48:09,729 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/602dfd21a/074d3e183a44423d9a63e5d8d3cb5465/FLAG3e1533521 [2020-08-19 06:48:10,179 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:48:10,180 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-08-19 06:48:10,187 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/602dfd21a/074d3e183a44423d9a63e5d8d3cb5465/FLAG3e1533521 [2020-08-19 06:48:10,564 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/602dfd21a/074d3e183a44423d9a63e5d8d3cb5465 [2020-08-19 06:48:10,572 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:48:10,574 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:48:10,575 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:48:10,575 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:48:10,579 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:48:10,580 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,583 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e7f3ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10, skipping insertion in model container [2020-08-19 06:48:10,583 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,590 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:48:10,605 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:48:10,775 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:48:10,780 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:48:10,797 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:48:10,812 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:48:10,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10 WrapperNode [2020-08-19 06:48:10,813 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:48:10,814 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:48:10,814 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:48:10,814 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:48:10,825 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,825 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,918 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,919 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,922 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,924 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,926 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... [2020-08-19 06:48:10,927 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:48:10,928 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:48:10,928 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:48:10,928 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:48:10,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:48:10,994 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:48:10,994 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:48:10,994 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-19 06:48:10,994 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-08-19 06:48:10,994 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:48:10,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 06:48:10,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:48:10,995 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-19 06:48:10,995 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-08-19 06:48:10,995 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:48:10,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:48:10,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:48:11,193 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:48:11,194 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 06:48:11,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:48:11 BoogieIcfgContainer [2020-08-19 06:48:11,198 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:48:11,199 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:48:11,199 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:48:11,202 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:48:11,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:48:10" (1/3) ... [2020-08-19 06:48:11,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7625d6ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:48:11, skipping insertion in model container [2020-08-19 06:48:11,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:48:10" (2/3) ... [2020-08-19 06:48:11,204 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7625d6ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:48:11, skipping insertion in model container [2020-08-19 06:48:11,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:48:11" (3/3) ... [2020-08-19 06:48:11,206 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-08-19 06:48:11,217 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:48:11,225 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:48:11,239 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:48:11,262 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:48:11,262 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:48:11,262 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:48:11,262 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:48:11,263 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:48:11,263 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:48:11,263 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:48:11,263 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:48:11,278 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-08-19 06:48:11,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 06:48:11,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:48:11,285 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:48:11,285 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:48:11,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:48:11,290 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-08-19 06:48:11,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:48:11,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167083585] [2020-08-19 06:48:11,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:48:11,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:48:11,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:48:11,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:48:11,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167083585] [2020-08-19 06:48:11,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:48:11,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:48:11,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859644986] [2020-08-19 06:48:11,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:48:11,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:48:11,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:48:11,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:48:11,599 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-08-19 06:48:11,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:48:11,698 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-19 06:48:11,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:48:11,700 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 06:48:11,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:48:11,711 INFO L225 Difference]: With dead ends: 36 [2020-08-19 06:48:11,712 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 06:48:11,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:48:11,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 06:48:11,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 06:48:11,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 06:48:11,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-19 06:48:11,757 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-08-19 06:48:11,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:48:11,758 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-19 06:48:11,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:48:11,758 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-19 06:48:11,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 06:48:11,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:48:11,760 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:48:11,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:48:11,761 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:48:11,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:48:11,761 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-08-19 06:48:11,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:48:11,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285001753] [2020-08-19 06:48:11,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:48:11,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:48:11,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:48:11,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:11,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:11,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:48:11,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285001753] [2020-08-19 06:48:11,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:48:11,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-19 06:48:11,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033722458] [2020-08-19 06:48:11,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:48:11,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:48:11,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:48:11,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:48:11,914 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-08-19 06:48:12,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:48:12,044 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-08-19 06:48:12,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:48:12,046 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-19 06:48:12,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:48:12,048 INFO L225 Difference]: With dead ends: 33 [2020-08-19 06:48:12,048 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 06:48:12,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:48:12,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 06:48:12,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-08-19 06:48:12,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 06:48:12,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-08-19 06:48:12,070 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-08-19 06:48:12,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:48:12,072 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-08-19 06:48:12,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:48:12,072 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-08-19 06:48:12,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 06:48:12,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:48:12,077 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, 1] [2020-08-19 06:48:12,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:48:12,078 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:48:12,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:48:12,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-08-19 06:48:12,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:48:12,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493153036] [2020-08-19 06:48:12,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:48:12,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:48:12,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:48:12,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-19 06:48:12,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493153036] [2020-08-19 06:48:12,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:48:12,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:48:12,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7037146] [2020-08-19 06:48:12,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:48:12,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:48:12,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:48:12,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:48:12,256 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 8 states. [2020-08-19 06:48:12,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:48:12,340 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-08-19 06:48:12,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:48:12,340 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-08-19 06:48:12,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:48:12,342 INFO L225 Difference]: With dead ends: 39 [2020-08-19 06:48:12,342 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 06:48:12,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:48:12,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 06:48:12,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-08-19 06:48:12,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 06:48:12,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-19 06:48:12,351 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-08-19 06:48:12,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:48:12,351 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-19 06:48:12,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:48:12,352 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-19 06:48:12,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 06:48:12,353 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:48:12,353 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, 1, 1, 1] [2020-08-19 06:48:12,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:48:12,354 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:48:12,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:48:12,355 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-08-19 06:48:12,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:48:12,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764657249] [2020-08-19 06:48:12,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:48:12,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:48:12,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:48:12,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,550 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:48:12,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764657249] [2020-08-19 06:48:12,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:48:12,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:48:12,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410754480] [2020-08-19 06:48:12,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:48:12,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:48:12,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:48:12,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:48:12,554 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2020-08-19 06:48:12,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:48:12,647 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-08-19 06:48:12,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:48:12,648 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-19 06:48:12,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:48:12,649 INFO L225 Difference]: With dead ends: 45 [2020-08-19 06:48:12,649 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 06:48:12,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:48:12,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 06:48:12,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-08-19 06:48:12,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 06:48:12,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-08-19 06:48:12,658 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-08-19 06:48:12,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:48:12,658 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-08-19 06:48:12,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:48:12,659 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-08-19 06:48:12,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 06:48:12,660 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:48:12,660 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, 1, 1, 1] [2020-08-19 06:48:12,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:48:12,661 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:48:12,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:48:12,661 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-08-19 06:48:12,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:48:12,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355677977] [2020-08-19 06:48:12,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:48:12,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:48:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:48:12,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:48:12,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:48:12,841 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-08-19 06:48:12,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355677977] [2020-08-19 06:48:12,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:48:12,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:48:12,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167355828] [2020-08-19 06:48:12,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:48:12,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:48:12,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:48:12,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:48:12,844 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2020-08-19 06:48:12,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:48:12,945 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-19 06:48:12,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:48:12,946 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-19 06:48:12,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:48:12,947 INFO L225 Difference]: With dead ends: 51 [2020-08-19 06:48:12,948 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 06:48:12,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:48:12,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 06:48:12,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-08-19 06:48:12,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 06:48:12,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-19 06:48:12,956 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-08-19 06:48:12,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:48:12,956 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-19 06:48:12,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:48:12,957 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-19 06:48:12,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 06:48:12,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:48:12,958 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, 1, 1, 1] [2020-08-19 06:48:12,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:48:12,959 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:48:12,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:48:12,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-08-19 06:48:12,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:48:12,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582770227] [2020-08-19 06:48:12,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:48:12,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 06:48:12,980 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 06:48:12,980 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 06:48:12,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:48:13,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 06:48:13 BoogieIcfgContainer [2020-08-19 06:48:13,008 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 06:48:13,010 INFO L168 Benchmark]: Toolchain (without parser) took 2435.88 ms. Allocated memory was 146.3 MB in the beginning and 233.8 MB in the end (delta: 87.6 MB). Free memory was 101.5 MB in the beginning and 142.7 MB in the end (delta: -41.2 MB). Peak memory consumption was 46.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:48:13,011 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 146.3 MB. Free memory was 119.5 MB in the beginning and 119.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 06:48:13,012 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.42 ms. Allocated memory is still 146.3 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:48:13,013 INFO L168 Benchmark]: Boogie Preprocessor took 113.55 ms. Allocated memory was 146.3 MB in the beginning and 201.9 MB in the end (delta: 55.6 MB). Free memory was 91.8 MB in the beginning and 180.9 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-08-19 06:48:13,014 INFO L168 Benchmark]: RCFGBuilder took 270.26 ms. Allocated memory is still 201.9 MB. Free memory was 180.2 MB in the beginning and 168.2 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-08-19 06:48:13,015 INFO L168 Benchmark]: TraceAbstraction took 1809.18 ms. Allocated memory was 201.9 MB in the beginning and 233.8 MB in the end (delta: 32.0 MB). Free memory was 167.6 MB in the beginning and 142.7 MB in the end (delta: 24.9 MB). Peak memory consumption was 56.9 MB. Max. memory is 7.1 GB. [2020-08-19 06:48:13,019 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 146.3 MB. Free memory was 119.5 MB in the beginning and 119.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.42 ms. Allocated memory is still 146.3 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.55 ms. Allocated memory was 146.3 MB in the beginning and 201.9 MB in the end (delta: 55.6 MB). Free memory was 91.8 MB in the beginning and 180.9 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 270.26 ms. Allocated memory is still 201.9 MB. Free memory was 180.2 MB in the beginning and 168.2 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1809.18 ms. Allocated memory was 201.9 MB in the beginning and 233.8 MB in the end (delta: 32.0 MB). Free memory was 167.6 MB in the beginning and 142.7 MB in the end (delta: 24.9 MB). Peak memory consumption was 56.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; [L19] CALL, EXPR id(input) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND TRUE x==0 [L13] return 0; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) [L19] int result = id(input); [L20] COND TRUE result == 5 [L21] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 92 SDtfs, 71 SDslu, 374 SDs, 0 SdLazy, 210 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred 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, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 168 NumberOfCodeBlocks, 168 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 120 ConstructedInterpolants, 0 QuantifiedInterpolants, 7200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 17/34 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...