/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 --rcfgbuilder.size.of.a.code.block SingleStatement --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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 14:29:39,571 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 14:29:39,575 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 14:29:39,604 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 14:29:39,604 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 14:29:39,605 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 14:29:39,607 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 14:29:39,609 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 14:29:39,617 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 14:29:39,618 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 14:29:39,621 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 14:29:39,622 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 14:29:39,622 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 14:29:39,625 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 14:29:39,626 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 14:29:39,627 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 14:29:39,631 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 14:29:39,633 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 14:29:39,635 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 14:29:39,639 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 14:29:39,641 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 14:29:39,645 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 14:29:39,647 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 14:29:39,648 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 14:29:39,653 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 14:29:39,653 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 14:29:39,653 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 14:29:39,658 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 14:29:39,658 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 14:29:39,660 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 14:29:39,660 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 14:29:39,662 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 14:29:39,663 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 14:29:39,664 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 14:29:39,666 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 14:29:39,666 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 14:29:39,667 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 14:29:39,667 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 14:29:39,667 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 14:29:39,668 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 14:29:39,670 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 14:29:39,671 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 [2020-09-25 14:29:39,728 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 14:29:39,728 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 14:29:39,730 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 14:29:39,731 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 14:29:39,731 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 14:29:39,731 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 14:29:39,732 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 14:29:39,732 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 14:29:39,732 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 14:29:39,732 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 14:29:39,733 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 14:29:39,734 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 14:29:39,734 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 14:29:39,734 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 14:29:39,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 14:29:39,735 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 14:29:39,735 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 14:29:39,735 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 14:29:39,735 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 14:29:39,736 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 14:29:39,736 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 14:29:39,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 14:29:39,736 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 14:29:39,737 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 14:29:39,737 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 14:29:39,737 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 14:29:39,737 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 14:29:39,737 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 14:29:39,738 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 14:29:39,738 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.rcfgbuilder: Size of a code block -> SingleStatement 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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-09-25 14:29:40,191 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 14:29:40,209 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 14:29:40,214 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 14:29:40,216 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 14:29:40,216 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 14:29:40,217 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-09-25 14:29:40,292 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0b79cd63c/4137e80c99cd424584369d06afbee09b/FLAG3f12b8a61 [2020-09-25 14:29:40,817 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 14:29:40,818 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-09-25 14:29:40,826 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0b79cd63c/4137e80c99cd424584369d06afbee09b/FLAG3f12b8a61 [2020-09-25 14:29:41,161 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0b79cd63c/4137e80c99cd424584369d06afbee09b [2020-09-25 14:29:41,177 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 14:29:41,182 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 14:29:41,183 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 14:29:41,183 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 14:29:41,187 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 14:29:41,188 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,193 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d85ba32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41, skipping insertion in model container [2020-09-25 14:29:41,193 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,203 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 14:29:41,227 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 14:29:41,429 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 14:29:41,434 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 14:29:41,449 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 14:29:41,465 INFO L208 MainTranslator]: Completed translation [2020-09-25 14:29:41,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41 WrapperNode [2020-09-25 14:29:41,466 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 14:29:41,467 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 14:29:41,467 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 14:29:41,467 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 14:29:41,481 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,482 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,488 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,488 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,567 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,570 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,571 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (1/1) ... [2020-09-25 14:29:41,573 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 14:29:41,574 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 14:29:41,574 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 14:29:41,574 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 14:29:41,575 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (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 [2020-09-25 14:29:41,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 14:29:41,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 14:29:41,659 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-09-25 14:29:41,660 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-09-25 14:29:41,660 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 14:29:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 14:29:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-09-25 14:29:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-09-25 14:29:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 14:29:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 14:29:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 14:29:41,867 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 14:29:41,868 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-25 14:29:41,874 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 02:29:41 BoogieIcfgContainer [2020-09-25 14:29:41,874 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 14:29:41,878 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 14:29:41,878 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 14:29:41,899 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 14:29:41,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 02:29:41" (1/3) ... [2020-09-25 14:29:41,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15bcfd48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 02:29:41, skipping insertion in model container [2020-09-25 14:29:41,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:29:41" (2/3) ... [2020-09-25 14:29:41,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15bcfd48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 02:29:41, skipping insertion in model container [2020-09-25 14:29:41,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 02:29:41" (3/3) ... [2020-09-25 14:29:41,911 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-09-25 14:29:41,944 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 14:29:41,968 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-09-25 14:29:42,015 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-09-25 14:29:42,054 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 14:29:42,055 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 14:29:42,055 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 14:29:42,055 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 14:29:42,056 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 14:29:42,056 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 14:29:42,056 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 14:29:42,056 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 14:29:42,084 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-09-25 14:29:42,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-25 14:29:42,090 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:29:42,091 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 14:29:42,092 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:29:42,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:29:42,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1612791331, now seen corresponding path program 1 times [2020-09-25 14:29:42,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:29:42,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975070829] [2020-09-25 14:29:42,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:29:42,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:29:42,248 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:29:42,346 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:29:42,346 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-09-25 14:29:42,347 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:29:42,347 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 117 [2020-09-25 14:29:42,349 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:29:42,350 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:29:42,350 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-25 14:29:42,350 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-09-25 14:29:42,350 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-25 14:29:42,351 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-09-25 14:29:42,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:29:42,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:29:42,467 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:29:42,475 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:29:42,475 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-25 14:29:42,475 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:29:42,476 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-09-25 14:29:42,476 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:29:42,476 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:29:42,476 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:29:42,477 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:29:42,477 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:29:42,477 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:29:42,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-25 14:29:42,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:29:42,491 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:29:42,501 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:29:42,502 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 14:29:42,502 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:29:42,502 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-09-25 14:29:42,502 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:29:42,503 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:29:42,503 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-25 14:29:42,503 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-25 14:29:42,503 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 14:29:42,504 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:29:42,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:29:42,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975070829] [2020-09-25 14:29:42,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:29:42,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-25 14:29:42,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13952246] [2020-09-25 14:29:42,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-25 14:29:42,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:29:42,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-25 14:29:42,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-25 14:29:42,577 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 8 states. [2020-09-25 14:29:42,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:29:42,793 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-09-25 14:29:42,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-25 14:29:42,795 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-09-25 14:29:42,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:29:42,809 INFO L225 Difference]: With dead ends: 43 [2020-09-25 14:29:42,809 INFO L226 Difference]: Without dead ends: 31 [2020-09-25 14:29:42,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-09-25 14:29:42,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-25 14:29:42,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-25 14:29:42,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-25 14:29:42,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-09-25 14:29:42,873 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 16 [2020-09-25 14:29:42,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:29:42,874 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-09-25 14:29:42,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-25 14:29:42,874 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-09-25 14:29:42,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-25 14:29:42,875 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:29:42,875 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 14:29:42,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 14:29:42,876 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:29:42,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:29:42,877 INFO L82 PathProgramCache]: Analyzing trace with hash 107301256, now seen corresponding path program 1 times [2020-09-25 14:29:42,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:29:42,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998539426] [2020-09-25 14:29:42,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:29:42,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 14:29:42,892 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 14:29:42,892 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 14:29:42,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 14:29:42,918 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 02:29:42 BoogieIcfgContainer [2020-09-25 14:29:42,919 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 14:29:42,923 INFO L168 Benchmark]: Toolchain (without parser) took 1742.58 ms. Allocated memory was 141.0 MB in the beginning and 204.5 MB in the end (delta: 63.4 MB). Free memory was 104.3 MB in the beginning and 121.4 MB in the end (delta: -17.1 MB). Peak memory consumption was 46.4 MB. Max. memory is 7.1 GB. [2020-09-25 14:29:42,924 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-25 14:29:42,925 INFO L168 Benchmark]: CACSL2BoogieTranslator took 284.12 ms. Allocated memory is still 141.0 MB. Free memory was 103.7 MB in the beginning and 94.7 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-09-25 14:29:42,926 INFO L168 Benchmark]: Boogie Preprocessor took 106.16 ms. Allocated memory was 141.0 MB in the beginning and 204.5 MB in the end (delta: 63.4 MB). Free memory was 94.7 MB in the beginning and 183.6 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-09-25 14:29:42,927 INFO L168 Benchmark]: RCFGBuilder took 300.65 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 172.2 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-09-25 14:29:42,928 INFO L168 Benchmark]: TraceAbstraction took 1040.97 ms. Allocated memory is still 204.5 MB. Free memory was 171.5 MB in the beginning and 121.4 MB in the end (delta: 50.1 MB). Peak memory consumption was 50.1 MB. Max. memory is 7.1 GB. [2020-09-25 14:29:42,932 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 284.12 ms. Allocated memory is still 141.0 MB. Free memory was 103.7 MB in the beginning and 94.7 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 106.16 ms. Allocated memory was 141.0 MB in the beginning and 204.5 MB in the end (delta: 63.4 MB). Free memory was 94.7 MB in the beginning and 183.6 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 300.65 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 172.2 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1040.97 ms. Allocated memory is still 204.5 MB. Free memory was 171.5 MB in the beginning and 121.4 MB in the end (delta: 50.1 MB). Peak memory consumption was 50.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] CALL f(4) [L7] COND FALSE !(n<3) [L8] n-- [L9] CALL f2(n) [L14] COND FALSE !(n<3) [L15] n-- [L16] CALL f(n) [L7] COND TRUE n<3 [L16] RET f(n) [L17] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 29 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.8s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 17 SDtfs, 11 SDslu, 92 SDs, 0 SdLazy, 56 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=1, 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 38 NumberOfCodeBlocks, 38 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 15 ConstructedInterpolants, 0 QuantifiedInterpolants, 495 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 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...