/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -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-d623d84 [2020-07-20 16:34:05,532 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:34:05,534 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:34:05,548 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:34:05,549 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:34:05,550 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:34:05,551 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:34:05,554 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:34:05,556 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:34:05,557 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:34:05,558 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:34:05,559 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:34:05,559 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:34:05,561 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:34:05,562 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:34:05,563 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:34:05,564 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:34:05,565 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:34:05,567 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:34:05,569 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:34:05,571 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:34:05,573 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:34:05,574 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:34:05,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:34:05,578 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:34:05,586 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:34:05,587 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:34:05,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:34:05,590 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:34:05,621 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:34:05,621 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:34:05,625 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:34:05,625 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:34:05,625 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:34:05,627 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:34:05,627 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:34:05,627 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:34:05,627 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:34:05,628 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:34:05,628 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:34:05,628 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:34:05,629 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:34:05,630 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:34:05,630 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:34:05,630 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:34:05,630 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:34:05,631 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:34:05,631 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:34:05,631 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:34:05,632 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:34:05,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:34:05,632 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:34:05,632 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:34:05,633 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:34:05,633 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:34:05,633 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:05,633 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:34:05,633 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:34:05,634 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:34:05,944 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:34:05,960 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:34:05,964 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:34:05,966 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:34:05,966 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:34:05,967 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-20 16:34:06,063 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3ae529dc/706c7de8c0754b2288739a618fdb8202/FLAG6f29b982e [2020-07-20 16:34:06,577 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:34:06,578 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-20 16:34:06,587 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3ae529dc/706c7de8c0754b2288739a618fdb8202/FLAG6f29b982e [2020-07-20 16:34:06,918 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3ae529dc/706c7de8c0754b2288739a618fdb8202 [2020-07-20 16:34:06,932 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:34:06,935 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:34:06,937 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:34:06,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:34:06,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:34:06,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:34:06" (1/1) ... [2020-07-20 16:34:06,946 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bc8845c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:06, skipping insertion in model container [2020-07-20 16:34:06,946 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:34:06" (1/1) ... [2020-07-20 16:34:06,953 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:34:06,968 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:34:07,136 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:34:07,142 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:34:07,158 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:34:07,174 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:34:07,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07 WrapperNode [2020-07-20 16:34:07,175 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:34:07,176 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:34:07,176 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:34:07,176 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:34:07,189 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,194 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,198 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,200 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,201 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... [2020-07-20 16:34:07,202 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:34:07,202 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:34:07,203 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:34:07,203 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:34:07,204 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:34:07,351 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:34:07,351 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:34:07,351 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-20 16:34:07,351 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-07-20 16:34:07,352 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:34:07,352 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:34:07,352 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-20 16:34:07,352 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-07-20 16:34:07,352 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:34:07,352 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:34:07,353 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:34:07,550 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:34:07,550 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:34:07,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:34:07 BoogieIcfgContainer [2020-07-20 16:34:07,554 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:34:07,555 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:34:07,555 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:34:07,558 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:34:07,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:34:06" (1/3) ... [2020-07-20 16:34:07,559 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c3dd467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:34:07, skipping insertion in model container [2020-07-20 16:34:07,559 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:07" (2/3) ... [2020-07-20 16:34:07,560 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c3dd467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:34:07, skipping insertion in model container [2020-07-20 16:34:07,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:34:07" (3/3) ... [2020-07-20 16:34:07,561 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-07-20 16:34:07,571 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:34:07,579 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 16:34:07,596 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 16:34:07,624 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:34:07,625 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:34:07,625 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:34:07,625 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:34:07,625 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:34:07,626 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:34:07,626 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:34:07,626 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:34:07,649 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 16:34:07,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:34:07,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:07,657 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:07,658 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:07,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:07,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-07-20 16:34:07,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:07,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685607216] [2020-07-20 16:34:07,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:07,741 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:34:07,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:07,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:34:07,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:07,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:34:07,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:34:07,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685607216] [2020-07-20 16:34:07,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:34:07,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 16:34:07,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772767490] [2020-07-20 16:34:07,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 16:34:07,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:34:07,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 16:34:07,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:34:07,913 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-07-20 16:34:08,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:08,092 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 16:34:08,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:34:08,095 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-20 16:34:08,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:08,107 INFO L225 Difference]: With dead ends: 34 [2020-07-20 16:34:08,108 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 16:34:08,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:34:08,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 16:34:08,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 16:34:08,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 16:34:08,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-07-20 16:34:08,164 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-07-20 16:34:08,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:08,164 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-07-20 16:34:08,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 16:34:08,165 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-07-20 16:34:08,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 16:34:08,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:08,166 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:08,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:08,383 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:08,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:08,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-07-20 16:34:08,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:08,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264304450] [2020-07-20 16:34:08,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:08,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:34:08,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:34:08,434 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:34:08,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:34:08,451 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:34:08,485 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:34:08,486 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:34:08,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:08,731 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:34:08 BoogieIcfgContainer [2020-07-20 16:34:08,731 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:34:08,734 INFO L168 Benchmark]: Toolchain (without parser) took 1799.61 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 102.4 MB in the beginning and 130.3 MB in the end (delta: -27.9 MB). Peak memory consumption was 29.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:08,736 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:34:08,736 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.58 ms. Allocated memory is still 144.7 MB. Free memory was 102.0 MB in the beginning and 93.0 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:08,737 INFO L168 Benchmark]: Boogie Preprocessor took 26.52 ms. Allocated memory is still 144.7 MB. Free memory was 93.0 MB in the beginning and 91.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:08,738 INFO L168 Benchmark]: RCFGBuilder took 351.77 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 91.7 MB in the beginning and 170.4 MB in the end (delta: -78.7 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:08,739 INFO L168 Benchmark]: TraceAbstraction took 1176.13 ms. Allocated memory is still 202.4 MB. Free memory was 169.7 MB in the beginning and 130.3 MB in the end (delta: 39.4 MB). Peak memory consumption was 39.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:08,744 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.58 ms. Allocated memory is still 144.7 MB. Free memory was 102.0 MB in the beginning and 93.0 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.52 ms. Allocated memory is still 144.7 MB. Free memory was 93.0 MB in the beginning and 91.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 351.77 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 91.7 MB in the beginning and 170.4 MB in the end (delta: -78.7 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1176.13 ms. Allocated memory is still 202.4 MB. Free memory was 169.7 MB in the beginning and 130.3 MB in the end (delta: 39.4 MB). Peak memory consumption was 39.4 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) VAL [\old(n)=4] [L7] COND FALSE !(n<3) [L8] n-- VAL [\old(n)=4, n=3] [L9] CALL f2(n) VAL [\old(n)=3] [L14] COND FALSE !(n<3) [L15] n-- VAL [\old(n)=3, n=2] [L16] CALL f(n) VAL [\old(n)=2] [L7] COND TRUE n<3 VAL [\old(n)=2, n=2] [L16] RET f(n) VAL [\old(n)=3, n=2] [L17] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.0s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 48 SDs, 0 SdLazy, 28 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=0, 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, 0.1s InterpolantComputationTime, 29 NumberOfCodeBlocks, 28 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 3 NumberOfNonLiveVariables, 28 ConjunctsInSsa, 6 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...