/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-28 17:12:29,047 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-28 17:12:29,049 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-28 17:12:29,083 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-28 17:12:29,083 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-28 17:12:29,085 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-28 17:12:29,086 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-28 17:12:29,089 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-28 17:12:29,091 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-28 17:12:29,092 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-28 17:12:29,093 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-28 17:12:29,095 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-28 17:12:29,095 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-28 17:12:29,096 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-28 17:12:29,098 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-28 17:12:29,099 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-28 17:12:29,100 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-28 17:12:29,101 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-28 17:12:29,103 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-28 17:12:29,105 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-28 17:12:29,107 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-28 17:12:29,111 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-28 17:12:29,113 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-28 17:12:29,115 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-28 17:12:29,121 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-28 17:12:29,122 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-28 17:12:29,122 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-28 17:12:29,123 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-28 17:12:29,124 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-28 17:12:29,130 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-28 17:12:29,130 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-28 17:12:29,141 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-28 17:12:29,143 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-28 17:12:29,144 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-28 17:12:29,145 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-28 17:12:29,146 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-28 17:12:29,146 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-28 17:12:29,147 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-28 17:12:29,147 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-28 17:12:29,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-28 17:12:29,148 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-28 17:12:29,150 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 [2020-10-28 17:12:29,206 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-28 17:12:29,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-28 17:12:29,208 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-28 17:12:29,208 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-28 17:12:29,209 INFO L138 SettingsManager]: * Use SBE=true [2020-10-28 17:12:29,209 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-28 17:12:29,210 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-28 17:12:29,210 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-28 17:12:29,210 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-28 17:12:29,210 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-28 17:12:29,210 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-28 17:12:29,211 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-28 17:12:29,211 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-28 17:12:29,211 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-28 17:12:29,212 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-28 17:12:29,212 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-28 17:12:29,213 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-28 17:12:29,213 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-28 17:12:29,213 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-28 17:12:29,213 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-28 17:12:29,213 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-28 17:12:29,213 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-28 17:12:29,214 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-28 17:12:29,214 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-28 17:12:29,214 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-28 17:12:29,214 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-28 17:12:29,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-28 17:12:29,215 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-28 17:12:29,215 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-28 17:12:29,215 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-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true;unknown-allowed=true; [2020-10-28 17:12:29,602 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-28 17:12:29,626 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-28 17:12:29,630 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-28 17:12:29,631 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-28 17:12:29,631 INFO L275 PluginConnector]: CDTParser initialized [2020-10-28 17:12:29,633 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-10-28 17:12:29,712 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7db186df7/b4937bec723542e48d6c6560e592f7b6/FLAG66c9d8d9e [2020-10-28 17:12:30,339 INFO L306 CDTParser]: Found 1 translation units. [2020-10-28 17:12:30,340 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann02.c [2020-10-28 17:12:30,348 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7db186df7/b4937bec723542e48d6c6560e592f7b6/FLAG66c9d8d9e [2020-10-28 17:12:30,710 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7db186df7/b4937bec723542e48d6c6560e592f7b6 [2020-10-28 17:12:30,713 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-28 17:12:30,720 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-28 17:12:30,723 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-28 17:12:30,724 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-28 17:12:30,727 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-28 17:12:30,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,732 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e34f48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30, skipping insertion in model container [2020-10-28 17:12:30,732 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,740 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-28 17:12:30,754 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-28 17:12:30,906 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 17:12:30,916 INFO L203 MainTranslator]: Completed pre-run [2020-10-28 17:12:30,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 17:12:30,949 INFO L208 MainTranslator]: Completed translation [2020-10-28 17:12:30,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30 WrapperNode [2020-10-28 17:12:30,949 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-28 17:12:30,951 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-28 17:12:30,951 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-28 17:12:30,951 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-28 17:12:30,963 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,964 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,971 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,972 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,977 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,979 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,981 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (1/1) ... [2020-10-28 17:12:30,983 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-28 17:12:30,984 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-28 17:12:30,984 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-28 17:12:30,984 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-28 17:12:30,985 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (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 [2020-10-28 17:12:31,062 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-28 17:12:31,062 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-28 17:12:31,062 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-28 17:12:31,062 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-10-28 17:12:31,063 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-28 17:12:31,063 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-28 17:12:31,063 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-28 17:12:31,063 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-28 17:12:31,063 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-28 17:12:31,064 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-28 17:12:31,064 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-10-28 17:12:31,064 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-28 17:12:31,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-28 17:12:31,064 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-28 17:12:31,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-28 17:12:31,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-28 17:12:31,065 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-28 17:12:31,065 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-28 17:12:31,313 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-28 17:12:31,314 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-28 17:12:31,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 05:12:31 BoogieIcfgContainer [2020-10-28 17:12:31,316 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-28 17:12:31,318 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-28 17:12:31,318 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-28 17:12:31,321 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-28 17:12:31,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 05:12:30" (1/3) ... [2020-10-28 17:12:31,323 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bb6779f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 05:12:31, skipping insertion in model container [2020-10-28 17:12:31,323 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:30" (2/3) ... [2020-10-28 17:12:31,323 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bb6779f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 05:12:31, skipping insertion in model container [2020-10-28 17:12:31,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 05:12:31" (3/3) ... [2020-10-28 17:12:31,325 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-10-28 17:12:31,341 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-28 17:12:31,346 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-28 17:12:31,366 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-28 17:12:31,451 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-28 17:12:31,451 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-28 17:12:31,452 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-28 17:12:31,452 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-28 17:12:31,452 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-28 17:12:31,452 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-28 17:12:31,452 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-28 17:12:31,452 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-28 17:12:31,494 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-10-28 17:12:31,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-28 17:12:31,508 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:12:31,510 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:12:31,511 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:12:31,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:12:31,525 INFO L82 PathProgramCache]: Analyzing trace with hash 192942640, now seen corresponding path program 1 times [2020-10-28 17:12:31,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:12:31,536 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993318316] [2020-10-28 17:12:31,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:12:31,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:31,751 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:32,021 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:32,021 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-28 17:12:32,022 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:32,022 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 299 [2020-10-28 17:12:32,024 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:32,024 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:32,024 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 17:12:32,024 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-28 17:12:32,024 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-28 17:12:32,025 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-28 17:12:32,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:12:32,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:32,185 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:32,195 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:32,195 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:12:32,195 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:32,195 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-28 17:12:32,195 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:32,196 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:32,196 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:12:32,196 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:32,196 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:12:32,196 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:32,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-28 17:12:32,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:32,210 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:32,223 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:32,223 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:12:32,224 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:32,224 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-10-28 17:12:32,224 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:32,224 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:32,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 17:12:32,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:32,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-28 17:12:32,225 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:12:32,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:12:32,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993318316] [2020-10-28 17:12:32,268 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:12:32,268 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-28 17:12:32,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22384383] [2020-10-28 17:12:32,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-28 17:12:32,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:12:32,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-28 17:12:32,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-28 17:12:32,291 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 6 states. [2020-10-28 17:12:32,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:12:32,663 INFO L93 Difference]: Finished difference Result 61 states and 84 transitions. [2020-10-28 17:12:32,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-28 17:12:32,665 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-10-28 17:12:32,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:12:32,675 INFO L225 Difference]: With dead ends: 61 [2020-10-28 17:12:32,676 INFO L226 Difference]: Without dead ends: 30 [2020-10-28 17:12:32,680 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-28 17:12:32,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-28 17:12:32,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-28 17:12:32,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-28 17:12:32,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-10-28 17:12:32,731 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 17 [2020-10-28 17:12:32,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:12:32,732 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-10-28 17:12:32,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-28 17:12:32,732 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-10-28 17:12:32,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-28 17:12:32,735 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:12:32,735 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] [2020-10-28 17:12:32,735 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-28 17:12:32,736 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:12:32,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:12:32,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1691639833, now seen corresponding path program 1 times [2020-10-28 17:12:32,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:12:32,738 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821257838] [2020-10-28 17:12:32,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:12:32,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:32,795 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,022 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,023 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-28 17:12:33,024 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,026 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 264 [2020-10-28 17:12:33,026 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,027 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,027 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-28 17:12:33,028 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-28 17:12:33,028 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-28 17:12:33,028 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:33,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:12:33,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,102 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,112 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,113 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:12:33,113 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,113 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-10-28 17:12:33,113 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,113 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,114 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:12:33,116 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:33,117 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:12:33,117 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-28 17:12:33,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-28 17:12:33,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,140 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,190 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,190 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 18 [2020-10-28 17:12:33,190 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,191 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 53 [2020-10-28 17:12:33,191 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,191 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,191 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-28 17:12:33,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:33,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-28 17:12:33,192 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:33,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-28 17:12:33,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,232 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,260 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,261 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:12:33,261 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,261 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 31 [2020-10-28 17:12:33,261 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,261 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-28 17:12:33,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:33,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-28 17:12:33,265 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-28 17:12:33,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-28 17:12:33,294 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821257838] [2020-10-28 17:12:33,295 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-28 17:12:33,295 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-28 17:12:33,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511138737] [2020-10-28 17:12:33,297 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-28 17:12:33,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:12:33,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-28 17:12:33,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-10-28 17:12:33,298 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 8 states. [2020-10-28 17:12:33,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:12:33,681 INFO L93 Difference]: Finished difference Result 52 states and 70 transitions. [2020-10-28 17:12:33,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-28 17:12:33,681 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-10-28 17:12:33,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:12:33,684 INFO L225 Difference]: With dead ends: 52 [2020-10-28 17:12:33,684 INFO L226 Difference]: Without dead ends: 47 [2020-10-28 17:12:33,686 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-10-28 17:12:33,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-28 17:12:33,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-10-28 17:12:33,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-28 17:12:33,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 65 transitions. [2020-10-28 17:12:33,701 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 65 transitions. Word has length 24 [2020-10-28 17:12:33,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:12:33,701 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 65 transitions. [2020-10-28 17:12:33,701 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-28 17:12:33,702 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 65 transitions. [2020-10-28 17:12:33,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-28 17:12:33,704 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:12:33,704 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:12:33,704 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-28 17:12:33,704 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:12:33,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:12:33,705 INFO L82 PathProgramCache]: Analyzing trace with hash -920167398, now seen corresponding path program 2 times [2020-10-28 17:12:33,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:12:33,706 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110527612] [2020-10-28 17:12:33,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:12:33,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,724 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,806 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,806 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-10-28 17:12:33,806 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,807 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 87 [2020-10-28 17:12:33,807 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,807 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-28 17:12:33,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 21 [2020-10-28 17:12:33,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-28 17:12:33,808 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:12:33,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:12:33,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,862 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,872 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,873 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:12:33,873 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,873 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-10-28 17:12:33,873 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,873 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:12:33,874 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:33,874 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:12:33,874 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:12:33,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-28 17:12:33,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,901 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,922 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,923 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-28 17:12:33,923 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,923 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 28 [2020-10-28 17:12:33,923 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,923 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-28 17:12:33,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 6 [2020-10-28 17:12:33,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-28 17:12:33,924 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:12:33,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-28 17:12:33,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,933 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,945 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,946 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 18 [2020-10-28 17:12:33,946 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,946 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-10-28 17:12:33,946 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,947 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-28 17:12:33,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-28 17:12:33,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-28 17:12:33,947 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:12:33,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-28 17:12:33,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:33,966 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:33,969 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:33,969 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:12:33,969 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:33,970 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-28 17:12:33,970 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:33,970 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:33,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:12:33,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:33,971 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-28 17:12:33,971 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:33,977 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-28 17:12:33,977 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110527612] [2020-10-28 17:12:33,978 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-28 17:12:33,978 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-28 17:12:33,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929206925] [2020-10-28 17:12:33,979 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-28 17:12:33,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:12:33,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-28 17:12:33,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-28 17:12:33,980 INFO L87 Difference]: Start difference. First operand 47 states and 65 transitions. Second operand 5 states. [2020-10-28 17:12:34,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:12:34,131 INFO L93 Difference]: Finished difference Result 91 states and 154 transitions. [2020-10-28 17:12:34,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-28 17:12:34,131 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-10-28 17:12:34,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:12:34,134 INFO L225 Difference]: With dead ends: 91 [2020-10-28 17:12:34,134 INFO L226 Difference]: Without dead ends: 53 [2020-10-28 17:12:34,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-28 17:12:34,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-28 17:12:34,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-10-28 17:12:34,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-28 17:12:34,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 77 transitions. [2020-10-28 17:12:34,153 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 77 transitions. Word has length 31 [2020-10-28 17:12:34,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:12:34,153 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 77 transitions. [2020-10-28 17:12:34,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-28 17:12:34,153 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 77 transitions. [2020-10-28 17:12:34,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-28 17:12:34,163 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:12:34,163 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:12:34,163 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-28 17:12:34,163 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:12:34,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:12:34,164 INFO L82 PathProgramCache]: Analyzing trace with hash -561126020, now seen corresponding path program 1 times [2020-10-28 17:12:34,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:12:34,164 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282744232] [2020-10-28 17:12:34,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:12:34,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-28 17:12:34,180 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-28 17:12:34,180 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-28 17:12:34,184 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-28 17:12:34,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 05:12:34 BoogieIcfgContainer [2020-10-28 17:12:34,208 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-28 17:12:34,211 INFO L168 Benchmark]: Toolchain (without parser) took 3494.02 ms. Allocated memory was 151.0 MB in the beginning and 188.7 MB in the end (delta: 37.7 MB). Free memory was 125.9 MB in the beginning and 97.9 MB in the end (delta: 28.0 MB). Peak memory consumption was 66.9 MB. Max. memory is 8.0 GB. [2020-10-28 17:12:34,211 INFO L168 Benchmark]: CDTParser took 0.51 ms. Allocated memory is still 151.0 MB. Free memory is still 124.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-28 17:12:34,212 INFO L168 Benchmark]: CACSL2BoogieTranslator took 226.41 ms. Allocated memory is still 151.0 MB. Free memory was 125.4 MB in the beginning and 116.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-10-28 17:12:34,213 INFO L168 Benchmark]: Boogie Preprocessor took 32.12 ms. Allocated memory is still 151.0 MB. Free memory was 116.1 MB in the beginning and 114.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-28 17:12:34,214 INFO L168 Benchmark]: RCFGBuilder took 332.00 ms. Allocated memory is still 151.0 MB. Free memory was 114.7 MB in the beginning and 100.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-10-28 17:12:34,215 INFO L168 Benchmark]: TraceAbstraction took 2890.07 ms. Allocated memory was 151.0 MB in the beginning and 188.7 MB in the end (delta: 37.7 MB). Free memory was 100.0 MB in the beginning and 97.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 40.7 MB. Max. memory is 8.0 GB. [2020-10-28 17:12:34,218 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.51 ms. Allocated memory is still 151.0 MB. Free memory is still 124.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 226.41 ms. Allocated memory is still 151.0 MB. Free memory was 125.4 MB in the beginning and 116.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 32.12 ms. Allocated memory is still 151.0 MB. Free memory was 116.1 MB in the beginning and 114.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 332.00 ms. Allocated memory is still 151.0 MB. Free memory was 114.7 MB in the beginning and 100.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2890.07 ms. Allocated memory was 151.0 MB in the beginning and 188.7 MB in the end (delta: 37.7 MB). Free memory was 100.0 MB in the beginning and 97.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 40.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int m = __VERIFIER_nondet_int(); [L29] COND FALSE !(m < 0 || m > 3) [L34] int n = __VERIFIER_nondet_int(); [L35] COND FALSE !(n < 0 || n > 23) [L41] CALL, EXPR ackermann(m,n) [L17] COND FALSE !(m==0) [L20] COND TRUE n==0 [L21] CALL, EXPR ackermann(m-1,1) [L17] COND FALSE !(m==0) [L20] COND FALSE !(n==0) [L23] CALL, EXPR ackermann(m,n-1) [L17] COND FALSE !(m==0) [L20] COND TRUE n==0 [L21] CALL, EXPR ackermann(m-1,1) [L17] COND TRUE m==0 [L18] return n+1; [L21] RET, EXPR ackermann(m-1,1) [L21] return ackermann(m-1,1); [L23] RET, EXPR ackermann(m,n-1) [L23] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) [L17] COND TRUE m==0 [L18] return n+1; [L23] RET, EXPR ackermann(m-1,ackermann(m,n-1)) [L23] return ackermann(m-1,ackermann(m,n-1)); [L21] RET, EXPR ackermann(m-1,1) [L21] return ackermann(m-1,1); [L41] RET, EXPR ackermann(m,n) [L41] int result = ackermann(m,n); [L42] COND FALSE !(m < 2 || result >= 4) [L45] CALL reach_error() [L3] __assert_fail("0", "Ackermann02.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.7s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 80 SDtfs, 109 SDslu, 63 SDs, 0 SdLazy, 243 SolverSat, 87 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=3, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 116 NumberOfCodeBlocks, 116 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 4973 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 15/19 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...