/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/id2_b5_o10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:21:23,418 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 22:21:23,439 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:21:23,440 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:21:23,442 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:21:23,444 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:21:23,446 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:21:23,447 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:21:23,448 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:21:23,450 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:21:23,450 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:21:23,451 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:21:23,452 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:21:23,453 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:21:23,454 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:21:23,455 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:21:23,457 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:21:23,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:21:23,461 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:21:23,462 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:21:23,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:21:23,465 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:21:23,468 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:21:23,479 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 22:21:23,495 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:21:23,495 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:21:23,496 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:21:23,497 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:21:23,497 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:21:23,497 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:21:23,497 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:21:23,498 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:21:23,498 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:21:23,498 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:21:23,498 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:21:23,498 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:21:23,498 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:21:23,499 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:21:23,499 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:21:23,499 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:21:23,499 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:21:23,499 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:21:23,500 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:21:23,500 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:21:23,500 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:21:23,500 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:21:23,501 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:21:23,501 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:21:23,501 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:21:23,501 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:21:23,501 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:23,501 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:21:23,502 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:21:23,502 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 22:21:23,855 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:21:23,874 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:21:23,879 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:21:23,883 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:21:23,884 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:21:23,885 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b5_o10.c [2020-07-21 22:21:23,992 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afc0b82aa/a273cb9ce7044baf9228bd365ff0af70/FLAG77a38f6f9 [2020-07-21 22:21:24,652 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:21:24,653 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b5_o10.c [2020-07-21 22:21:24,660 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afc0b82aa/a273cb9ce7044baf9228bd365ff0af70/FLAG77a38f6f9 [2020-07-21 22:21:24,974 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/afc0b82aa/a273cb9ce7044baf9228bd365ff0af70 [2020-07-21 22:21:24,986 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:21:24,989 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:21:24,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:21:24,991 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:21:24,995 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:21:24,997 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:21:24" (1/1) ... [2020-07-21 22:21:25,001 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55fc409a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:24, skipping insertion in model container [2020-07-21 22:21:25,002 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:21:24" (1/1) ... [2020-07-21 22:21:25,012 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:21:25,040 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:21:25,299 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:21:25,306 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:21:25,329 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:21:25,349 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:21:25,349 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25 WrapperNode [2020-07-21 22:21:25,350 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:21:25,351 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:21:25,351 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:21:25,351 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:21:25,365 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,366 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,372 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,373 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,479 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,482 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,484 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (1/1) ... [2020-07-21 22:21:25,486 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:21:25,487 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:21:25,487 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:21:25,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:21:25,489 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (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 22:21:25,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:21:25,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:21:25,573 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 22:21:25,573 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 22:21:25,573 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:21:25,573 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 22:21:25,574 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:21:25,574 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 22:21:25,574 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 22:21:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:21:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:21:25,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:21:25,832 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:21:25,833 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:21:25,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:21:25 BoogieIcfgContainer [2020-07-21 22:21:25,840 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:21:25,842 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:21:25,843 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:21:25,847 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:21:25,848 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:21:24" (1/3) ... [2020-07-21 22:21:25,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b68f85f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:21:25, skipping insertion in model container [2020-07-21 22:21:25,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:25" (2/3) ... [2020-07-21 22:21:25,850 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b68f85f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:21:25, skipping insertion in model container [2020-07-21 22:21:25,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:21:25" (3/3) ... [2020-07-21 22:21:25,853 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b5_o10.c [2020-07-21 22:21:25,879 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:21:25,896 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:21:25,946 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:21:25,994 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:21:25,995 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:21:25,995 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:21:25,995 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:21:25,996 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:21:25,996 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:21:25,996 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:21:25,996 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:21:26,019 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 22:21:26,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:21:26,027 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:26,029 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:26,030 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:26,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:26,038 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 22:21:26,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:26,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508516327] [2020-07-21 22:21:26,048 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 22:21:26,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:21:26,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:26,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:21:26,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:21:26,233 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 22:21:26,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:21:26,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508516327] [2020-07-21 22:21:26,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:21:26,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:21:26,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491141088] [2020-07-21 22:21:26,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:21:26,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:21:26,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:21:26,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:21:26,264 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 22:21:26,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:21:26,337 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 22:21:26,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:21:26,340 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:21:26,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:21:26,351 INFO L225 Difference]: With dead ends: 40 [2020-07-21 22:21:26,351 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 22:21:26,355 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 22:21:26,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 22:21:26,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 22:21:26,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:21:26,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 22:21:26,425 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 22:21:26,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:21:26,426 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 22:21:26,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:21:26,427 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 22:21:26,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 22:21:26,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:26,431 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:26,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:26,645 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:26,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:26,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 22:21:26,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:26,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795470835] [2020-07-21 22:21:26,648 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 22:21:26,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:21:26,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:26,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:21:26,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:21:26,730 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 22:21:26,731 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:21:26,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795470835] [2020-07-21 22:21:26,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:21:26,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:21:26,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752909444] [2020-07-21 22:21:26,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:21:26,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:21:26,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:21:26,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:21:26,737 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 22:21:26,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:21:26,776 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 22:21:26,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:21:26,777 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 22:21:26,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:21:26,779 INFO L225 Difference]: With dead ends: 44 [2020-07-21 22:21:26,779 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 22:21:26,781 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 22:21:26,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 22:21:26,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 22:21:26,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:21:26,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 22:21:26,793 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 22:21:26,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:21:26,793 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 22:21:26,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:21:26,794 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 22:21:26,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 22:21:26,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:26,796 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:27,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:27,009 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:27,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:27,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 22:21:27,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:27,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381083831] [2020-07-21 22:21:27,012 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 22:21:27,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:21:27,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:27,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:21:27,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:21:27,171 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 22:21:27,171 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:21:27,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381083831] [2020-07-21 22:21:27,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:21:27,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 22:21:27,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492321875] [2020-07-21 22:21:27,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 22:21:27,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:21:27,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 22:21:27,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 22:21:27,175 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 22:21:27,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:21:27,263 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 22:21:27,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:21:27,265 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 22:21:27,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:21:27,267 INFO L225 Difference]: With dead ends: 36 [2020-07-21 22:21:27,267 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 22:21:27,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:21:27,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 22:21:27,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 22:21:27,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:21:27,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 22:21:27,277 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 22:21:27,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:21:27,278 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 22:21:27,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 22:21:27,278 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 22:21:27,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:21:27,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:27,280 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:27,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:27,494 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:27,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:27,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 22:21:27,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:27,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173504035] [2020-07-21 22:21:27,496 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 22:21:27,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:21:27,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:27,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:21:27,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:21:27,586 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 22:21:27,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:21:27,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173504035] [2020-07-21 22:21:27,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:21:27,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:21:27,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896205351] [2020-07-21 22:21:27,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:21:27,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:21:27,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:21:27,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:21:27,592 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 22:21:27,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:21:27,622 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 22:21:27,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:21:27,624 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 22:21:27,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:21:27,625 INFO L225 Difference]: With dead ends: 48 [2020-07-21 22:21:27,626 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:21:27,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 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 22:21:27,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:21:27,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 22:21:27,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 22:21:27,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 22:21:27,637 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 22:21:27,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:21:27,637 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 22:21:27,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:21:27,638 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 22:21:27,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:21:27,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:27,640 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:27,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:27,846 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:27,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:27,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 22:21:27,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:27,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704338364] [2020-07-21 22:21:27,849 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 22:21:27,904 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:21:27,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:27,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:21:27,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:21:27,955 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 22:21:27,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:21:27,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704338364] [2020-07-21 22:21:27,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:21:27,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:21:27,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426609945] [2020-07-21 22:21:27,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:21:27,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:21:27,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:21:27,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:21:27,963 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 5 states. [2020-07-21 22:21:27,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:21:27,987 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2020-07-21 22:21:27,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:21:27,988 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 22:21:27,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:21:27,990 INFO L225 Difference]: With dead ends: 40 [2020-07-21 22:21:27,990 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:21:28,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 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 22:21:28,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:21:28,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 22:21:28,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 22:21:28,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 22:21:28,025 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 22:21:28,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:21:28,028 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 22:21:28,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:21:28,029 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 22:21:28,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:21:28,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:28,034 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:28,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:28,248 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:28,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:28,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 22:21:28,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:28,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158199350] [2020-07-21 22:21:28,252 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 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:28,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:21:28,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:28,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 22:21:28,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:21:28,438 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 22:21:28,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:21:28,999 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 22:21:29,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158199350] [2020-07-21 22:21:29,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:21:29,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 22:21:29,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726657063] [2020-07-21 22:21:29,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 22:21:29,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:21:29,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 22:21:29,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:21:29,016 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 20 states. [2020-07-21 22:21:29,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:21:29,350 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-21 22:21:29,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 22:21:29,352 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-21 22:21:29,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:21:29,353 INFO L225 Difference]: With dead ends: 54 [2020-07-21 22:21:29,353 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:21:29,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2020-07-21 22:21:29,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:21:29,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:21:29,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:21:29,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:21:29,356 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-21 22:21:29,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:21:29,356 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:21:29,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 22:21:29,356 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:21:29,356 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:21:29,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:29,562 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:21:29,632 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:21:29,632 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:21:29,633 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 22:21:29,633 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-21 22:21:29,633 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-21 22:21:29,633 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-21 22:21:29,633 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-21 22:21:29,634 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-21 22:21:29,634 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-21 22:21:29,634 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:21:29,634 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:21:29,634 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:21:29,634 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:21:29,635 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-21 22:21:29,635 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-21 22:21:29,635 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-21 22:21:29,635 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-21 22:21:29,635 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-21 22:21:29,635 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-21 22:21:29,636 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 22:21:29,636 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-21 22:21:29,636 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-21 22:21:29,636 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-21 22:21:29,636 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-21 22:21:29,636 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-21 22:21:29,637 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 22:21:29,637 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 22:21:29,637 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-21 22:21:29,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:21:29 BoogieIcfgContainer [2020-07-21 22:21:29,645 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:21:29,649 INFO L168 Benchmark]: Toolchain (without parser) took 4659.62 ms. Allocated memory was 138.9 MB in the beginning and 231.2 MB in the end (delta: 92.3 MB). Free memory was 101.9 MB in the beginning and 111.0 MB in the end (delta: -9.0 MB). Peak memory consumption was 83.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:21:29,650 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 138.9 MB. Free memory was 120.0 MB in the beginning and 119.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 22:21:29,651 INFO L168 Benchmark]: CACSL2BoogieTranslator took 359.77 ms. Allocated memory is still 138.9 MB. Free memory was 101.5 MB in the beginning and 91.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:21:29,652 INFO L168 Benchmark]: Boogie Preprocessor took 135.92 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 91.9 MB in the beginning and 180.6 MB in the end (delta: -88.7 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:21:29,653 INFO L168 Benchmark]: RCFGBuilder took 353.32 ms. Allocated memory is still 201.3 MB. Free memory was 180.6 MB in the beginning and 167.1 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:21:29,655 INFO L168 Benchmark]: TraceAbstraction took 3802.87 ms. Allocated memory was 201.3 MB in the beginning and 231.2 MB in the end (delta: 29.9 MB). Free memory was 166.4 MB in the beginning and 111.0 MB in the end (delta: 55.5 MB). Peak memory consumption was 85.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:21:29,659 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 138.9 MB. Free memory was 120.0 MB in the beginning and 119.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 359.77 ms. Allocated memory is still 138.9 MB. Free memory was 101.5 MB in the beginning and 91.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 135.92 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 91.9 MB in the beginning and 180.6 MB in the end (delta: -88.7 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 353.32 ms. Allocated memory is still 201.3 MB. Free memory was 180.6 MB in the beginning and 167.1 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3802.87 ms. Allocated memory was 201.3 MB in the beginning and 231.2 MB in the end (delta: 29.9 MB). Free memory was 166.4 MB in the beginning and 111.0 MB in the end (delta: 55.5 MB). Peak memory consumption was 85.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 25]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.5s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 166 SDtfs, 18 SDslu, 797 SDs, 0 SdLazy, 199 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 160 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred 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, 6 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 9 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 134 NumberOfCodeBlocks, 122 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 154 ConstructedInterpolants, 0 QuantifiedInterpolants, 6774 SizeOfPredicates, 9 NumberOfNonLiveVariables, 280 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 7 InterpolantComputations, 5 PerfectInterpolantSequences, 12/16 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 correct! Received shutdown request...