/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 BIGGEST_EQUIVALENCE_CLASS --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/id_b3_o2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:52:28,594 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:52:28,597 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:52:28,613 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:52:28,613 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:52:28,615 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:52:28,617 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:52:28,619 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:52:28,621 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:52:28,623 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:52:28,624 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:52:28,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:52:28,626 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:52:28,628 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:52:28,629 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:52:28,631 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:52:28,632 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:52:28,633 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:52:28,636 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:52:28,638 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:52:28,640 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:52:28,642 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:52:28,643 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:52:28,644 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:52:28,646 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:52:28,659 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 [2020-07-21 00:52:28,677 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:52:28,678 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:52:28,679 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:52:28,680 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:52:28,680 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:52:28,680 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:52:28,681 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:52:28,681 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:52:28,681 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:52:28,681 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:52:28,681 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:52:28,681 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:52:28,682 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:52:28,682 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:52:28,682 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:52:28,682 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:52:28,682 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:52:28,683 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:52:28,683 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:52:28,683 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:52:28,683 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:52:28,684 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:52:28,684 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:52:28,684 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:52:28,684 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:52:28,684 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:52:28,685 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:28,685 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:52:28,685 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:52:28,685 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 00:52:29,020 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:52:29,049 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:52:29,056 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:52:29,059 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:52:29,059 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:52:29,062 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c [2020-07-21 00:52:29,178 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aeb14cc19/41708b57655340a39d64d6dfcb2f80b5/FLAGc43038504 [2020-07-21 00:52:29,883 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:52:29,884 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c [2020-07-21 00:52:29,897 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aeb14cc19/41708b57655340a39d64d6dfcb2f80b5/FLAGc43038504 [2020-07-21 00:52:30,220 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aeb14cc19/41708b57655340a39d64d6dfcb2f80b5 [2020-07-21 00:52:30,232 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:52:30,236 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:52:30,238 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:52:30,238 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:52:30,242 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:52:30,244 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,248 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f6675be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30, skipping insertion in model container [2020-07-21 00:52:30,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,261 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:52:30,282 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:52:30,493 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:52:30,501 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:52:30,522 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:52:30,544 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:52:30,544 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30 WrapperNode [2020-07-21 00:52:30,545 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:52:30,546 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:52:30,547 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:52:30,547 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:52:30,566 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,566 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,573 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,574 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,579 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,582 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ... [2020-07-21 00:52:30,586 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:52:30,587 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:52:30,587 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:52:30,587 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:52:30,589 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (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 [2020-07-21 00:52:30,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:52:30,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:52:30,785 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 00:52:30,785 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:52:30,785 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:52:30,785 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:52:30,785 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 00:52:30,786 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:52:30,786 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:52:30,786 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:52:31,015 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:52:31,016 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:52:31,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:52:31 BoogieIcfgContainer [2020-07-21 00:52:31,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:52:31,026 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:52:31,026 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:52:31,032 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:52:31,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:52:30" (1/3) ... [2020-07-21 00:52:31,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39c6c1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:52:31, skipping insertion in model container [2020-07-21 00:52:31,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (2/3) ... [2020-07-21 00:52:31,037 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39c6c1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:52:31, skipping insertion in model container [2020-07-21 00:52:31,037 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:52:31" (3/3) ... [2020-07-21 00:52:31,040 INFO L109 eAbstractionObserver]: Analyzing ICFG id_b3_o2-2.c [2020-07-21 00:52:31,056 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:52:31,079 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:52:31,160 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:52:31,230 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:52:31,230 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:52:31,230 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:52:31,231 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:52:31,231 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:52:31,231 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:52:31,231 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:52:31,232 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:52:31,257 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 00:52:31,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:52:31,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:31,267 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:31,268 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:31,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:31,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1250208381, now seen corresponding path program 1 times [2020-07-21 00:52:31,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:31,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318384472] [2020-07-21 00:52:31,291 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 [2020-07-21 00:52:31,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:52:31,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:31,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:52:31,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:31,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:52:31,519 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:52:31,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318384472] [2020-07-21 00:52:31,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:52:31,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:52:31,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138259079] [2020-07-21 00:52:31,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:52:31,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:31,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:52:31,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:52:31,551 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2020-07-21 00:52:31,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:31,628 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-07-21 00:52:31,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:52:31,631 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:52:31,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:31,644 INFO L225 Difference]: With dead ends: 33 [2020-07-21 00:52:31,644 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 00:52:31,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:52:31,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 00:52:31,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 00:52:31,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 00:52:31,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-07-21 00:52:31,722 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2020-07-21 00:52:31,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:31,723 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-07-21 00:52:31,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:52:31,723 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-07-21 00:52:31,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 00:52:31,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:31,727 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:31,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:31,943 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:31,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1951994857, now seen corresponding path program 1 times [2020-07-21 00:52:31,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:31,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016994673] [2020-07-21 00:52:31,944 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 [2020-07-21 00:52:31,984 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:52:31,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:31,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:52:31,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:32,033 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:52:32,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:52:32,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016994673] [2020-07-21 00:52:32,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:52:32,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:52:32,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415052021] [2020-07-21 00:52:32,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:52:32,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:32,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:52:32,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:52:32,039 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 5 states. [2020-07-21 00:52:32,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:32,072 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-07-21 00:52:32,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:52:32,073 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 00:52:32,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:32,075 INFO L225 Difference]: With dead ends: 31 [2020-07-21 00:52:32,075 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:52:32,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:52:32,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:52:32,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:52:32,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:52:32,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-07-21 00:52:32,087 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 20 [2020-07-21 00:52:32,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:32,088 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-07-21 00:52:32,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:52:32,088 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-07-21 00:52:32,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 00:52:32,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:32,090 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:32,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:32,293 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:32,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:32,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1923365706, now seen corresponding path program 1 times [2020-07-21 00:52:32,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:32,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903373741] [2020-07-21 00:52:32,296 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 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:32,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:52:32,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:32,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:52:32,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:32,470 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:52:32,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:32,686 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:52:32,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903373741] [2020-07-21 00:52:32,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:32,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-07-21 00:52:32,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399396689] [2020-07-21 00:52:32,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 00:52:32,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:32,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 00:52:32,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 00:52:32,691 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2020-07-21 00:52:32,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:32,771 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-21 00:52:32,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:52:32,772 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 00:52:32,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:32,774 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:52:32,775 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:52:32,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 6 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:52:32,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:52:32,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 00:52:32,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 00:52:32,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-07-21 00:52:32,786 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 20 [2020-07-21 00:52:32,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:32,787 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-07-21 00:52:32,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 00:52:32,787 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-07-21 00:52:32,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:52:32,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:32,789 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:33,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:33,006 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:33,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:33,007 INFO L82 PathProgramCache]: Analyzing trace with hash 376843494, now seen corresponding path program 1 times [2020-07-21 00:52:33,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:33,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392232342] [2020-07-21 00:52:33,009 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 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:33,105 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:52:33,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:33,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:52:33,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:33,232 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 00:52:33,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:33,531 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 00:52:33,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392232342] [2020-07-21 00:52:33,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:33,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 00:52:33,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436659398] [2020-07-21 00:52:33,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:52:33,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:33,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:52:33,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:52:33,536 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 11 states. [2020-07-21 00:52:33,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:33,618 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2020-07-21 00:52:33,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:52:33,619 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2020-07-21 00:52:33,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:33,621 INFO L225 Difference]: With dead ends: 39 [2020-07-21 00:52:33,621 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 00:52:33,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:52:33,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 00:52:33,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-07-21 00:52:33,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 00:52:33,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 00:52:33,633 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 27 [2020-07-21 00:52:33,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:33,634 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 00:52:33,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:52:33,634 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 00:52:33,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:52:33,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:33,636 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:33,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:33,852 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:33,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:33,853 INFO L82 PathProgramCache]: Analyzing trace with hash 405472645, now seen corresponding path program 2 times [2020-07-21 00:52:33,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:33,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119424479] [2020-07-21 00:52:33,855 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 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:33,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:52:33,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 00:52:33,914 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:52:33,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 00:52:33,927 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:52:33,950 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 00:52:33,951 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 00:52:34,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:34,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:52:34 BoogieIcfgContainer [2020-07-21 00:52:34,193 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:52:34,195 INFO L168 Benchmark]: Toolchain (without parser) took 3960.43 ms. Allocated memory was 135.8 MB in the beginning and 227.5 MB in the end (delta: 91.8 MB). Free memory was 100.7 MB in the beginning and 152.5 MB in the end (delta: -51.8 MB). Peak memory consumption was 39.9 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:34,197 INFO L168 Benchmark]: CDTParser took 0.85 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 00:52:34,198 INFO L168 Benchmark]: CACSL2BoogieTranslator took 307.87 ms. Allocated memory is still 135.8 MB. Free memory was 100.3 MB in the beginning and 91.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:34,199 INFO L168 Benchmark]: Boogie Preprocessor took 39.93 ms. Allocated memory is still 135.8 MB. Free memory was 91.0 MB in the beginning and 89.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:34,199 INFO L168 Benchmark]: RCFGBuilder took 436.49 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 89.6 MB in the beginning and 166.9 MB in the end (delta: -77.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:34,201 INFO L168 Benchmark]: TraceAbstraction took 3166.90 ms. Allocated memory was 199.2 MB in the beginning and 227.5 MB in the end (delta: 28.3 MB). Free memory was 166.2 MB in the beginning and 152.5 MB in the end (delta: 13.7 MB). Peak memory consumption was 42.0 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:34,205 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.85 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 307.87 ms. Allocated memory is still 135.8 MB. Free memory was 100.3 MB in the beginning and 91.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 39.93 ms. Allocated memory is still 135.8 MB. Free memory was 91.0 MB in the beginning and 89.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 436.49 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 89.6 MB in the beginning and 166.9 MB in the end (delta: -77.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3166.90 ms. Allocated memory was 199.2 MB in the beginning and 227.5 MB in the end (delta: 28.3 MB). Free memory was 166.2 MB in the beginning and 152.5 MB in the end (delta: 13.7 MB). Peak memory consumption was 42.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 15]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int input = __VERIFIER_nondet_int(); [L13] CALL, EXPR id(input) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id((unsigned int)x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id((unsigned int)x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id((unsigned int)x-1) VAL [\old(x)=1, id((unsigned int)x-1)=0, x=1] [L6] int ret = id((unsigned int)x-1) + 1; [L7] COND FALSE !(ret > 3) [L8] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L6] RET, EXPR id((unsigned int)x-1) VAL [\old(x)=2, id((unsigned int)x-1)=1, x=2] [L6] int ret = id((unsigned int)x-1) + 1; [L7] COND FALSE !(ret > 3) [L8] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L13] RET, EXPR id(input) VAL [id(input)=2, input=2] [L13] int result = id(input); [L14] COND TRUE result == 2 VAL [input=2, result=2] [L15] __VERIFIER_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.9s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 77 SDtfs, 14 SDslu, 265 SDs, 0 SdLazy, 62 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 126 GetRequests, 93 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=4, 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, 4 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 107 NumberOfCodeBlocks, 101 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 121 ConstructedInterpolants, 0 QuantifiedInterpolants, 4267 SizeOfPredicates, 6 NumberOfNonLiveVariables, 193 ConjunctsInSsa, 22 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 30/42 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...