/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:00:32,003 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 11:00:32,024 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:00:32,025 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:00:32,027 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:00:32,029 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:00:32,031 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:00:32,033 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:00:32,034 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:00:32,035 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:00:32,036 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:00:32,037 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:00:32,039 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:00:32,040 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:00:32,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:00:32,043 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:00:32,045 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:00:32,048 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:00:32,050 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:00:32,052 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:00:32,054 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:00:32,055 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:00:32,058 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:00:32,069 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:00:32,070 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:00:32,071 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:00:32,072 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 11:00:32,090 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:00:32,091 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:00:32,092 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:00:32,092 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:00:32,093 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:00:32,093 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:00:32,093 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:00:32,093 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:00:32,094 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:00:32,094 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:00:32,094 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:00:32,094 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:00:32,094 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:00:32,095 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:00:32,095 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:00:32,095 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:00:32,095 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:00:32,095 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:00:32,096 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:00:32,096 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:00:32,096 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:00:32,096 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:00:32,096 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:00:32,097 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:00:32,097 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:00:32,097 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:00:32,097 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:32,097 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:00:32,098 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:00:32,098 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 -> NOT_INCREMENTALLY [2020-07-21 11:00:32,439 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:00:32,457 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:00:32,464 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:00:32,466 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:00:32,470 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:00:32,472 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-21 11:00:32,580 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/034ade6c5/6453292e3bf54086b39855769381d035/FLAGf5c4d4e38 [2020-07-21 11:00:33,152 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:00:33,153 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-21 11:00:33,162 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/034ade6c5/6453292e3bf54086b39855769381d035/FLAGf5c4d4e38 [2020-07-21 11:00:33,463 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/034ade6c5/6453292e3bf54086b39855769381d035 [2020-07-21 11:00:33,477 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:00:33,481 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:00:33,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:00:33,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:00:33,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:00:33,490 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,494 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@561ec46e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33, skipping insertion in model container [2020-07-21 11:00:33,494 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,504 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:00:33,525 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:00:33,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:00:33,706 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:00:33,725 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:00:33,740 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:00:33,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33 WrapperNode [2020-07-21 11:00:33,741 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:00:33,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:00:33,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:00:33,742 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:00:33,755 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,755 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,760 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,761 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,764 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (1/1) ... [2020-07-21 11:00:33,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:00:33,770 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:00:33,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:00:33,770 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:00:33,771 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (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 11:00:33,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:00:33,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:00:33,942 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 11:00:33,942 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 11:00:33,942 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:00:33,942 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 11:00:33,942 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:00:33,943 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 11:00:33,944 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 11:00:33,944 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:00:33,944 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:00:33,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:00:34,210 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:00:34,211 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 11:00:34,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:00:34 BoogieIcfgContainer [2020-07-21 11:00:34,219 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:00:34,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:00:34,221 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:00:34,226 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:00:34,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:00:33" (1/3) ... [2020-07-21 11:00:34,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228bb755 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:00:34, skipping insertion in model container [2020-07-21 11:00:34,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:00:33" (2/3) ... [2020-07-21 11:00:34,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228bb755 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:00:34, skipping insertion in model container [2020-07-21 11:00:34,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:00:34" (3/3) ... [2020-07-21 11:00:34,231 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-07-21 11:00:34,245 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:00:34,256 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:00:34,285 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:00:34,324 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:00:34,324 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:00:34,324 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:00:34,325 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:00:34,327 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:00:34,327 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:00:34,327 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:00:34,327 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:00:34,368 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 11:00:34,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 11:00:34,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:00:34,390 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:00:34,391 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:00:34,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:00:34,404 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 11:00:34,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:00:34,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066686939] [2020-07-21 11:00:34,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:00:34,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:00:34,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:00:34,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:00:34,593 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 11:00:34,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:00:34,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066686939] [2020-07-21 11:00:34,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:00:34,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:00:34,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747160566] [2020-07-21 11:00:34,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:00:34,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:00:34,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:00:34,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:00:34,622 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 11:00:34,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:00:34,702 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 11:00:34,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:00:34,706 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 11:00:34,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:00:34,719 INFO L225 Difference]: With dead ends: 40 [2020-07-21 11:00:34,720 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 11:00:34,725 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 11:00:34,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 11:00:34,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 11:00:34,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 11:00:34,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 11:00:34,786 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 11:00:34,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:00:34,787 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 11:00:34,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:00:34,787 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 11:00:34,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:00:34,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:00:34,790 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 11:00:35,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:35,004 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:00:35,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:00:35,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 11:00:35,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:00:35,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597130972] [2020-07-21 11:00:35,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:00:35,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:00:35,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:00:35,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:00:35,093 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 11:00:35,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:00:35,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597130972] [2020-07-21 11:00:35,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:00:35,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:00:35,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281186750] [2020-07-21 11:00:35,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:00:35,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:00:35,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:00:35,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:00:35,099 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 11:00:35,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:00:35,137 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 11:00:35,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:00:35,138 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 11:00:35,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:00:35,140 INFO L225 Difference]: With dead ends: 44 [2020-07-21 11:00:35,140 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 11:00:35,142 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 11:00:35,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 11:00:35,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 11:00:35,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 11:00:35,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 11:00:35,153 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 11:00:35,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:00:35,153 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 11:00:35,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:00:35,154 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 11:00:35,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:00:35,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:00:35,155 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 11:00:35,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:35,371 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:00:35,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:00:35,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 11:00:35,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:00:35,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622905633] [2020-07-21 11:00:35,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:00:35,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:00:35,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:00:35,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:00:35,494 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 11:00:35,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:00:35,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622905633] [2020-07-21 11:00:35,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:00:35,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 11:00:35,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567374767] [2020-07-21 11:00:35,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:00:35,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:00:35,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:00:35,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:00:35,498 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 11:00:35,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:00:35,575 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 11:00:35,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:00:35,575 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 11:00:35,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:00:35,577 INFO L225 Difference]: With dead ends: 36 [2020-07-21 11:00:35,577 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 11:00:35,578 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 11:00:35,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 11:00:35,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 11:00:35,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 11:00:35,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 11:00:35,586 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 11:00:35,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:00:35,587 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 11:00:35,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:00:35,587 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 11:00:35,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:00:35,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:00:35,589 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 11:00:35,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:35,803 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:00:35,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:00:35,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 11:00:35,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:00:35,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681783424] [2020-07-21 11:00:35,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:00:35,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:00:35,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:00:35,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:00:35,897 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 11:00:35,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:00:35,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681783424] [2020-07-21 11:00:35,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:00:35,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:00:35,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826128168] [2020-07-21 11:00:35,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:00:35,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:00:35,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:00:35,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:00:35,901 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 11:00:35,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:00:35,935 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 11:00:35,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:00:35,936 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 11:00:35,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:00:35,937 INFO L225 Difference]: With dead ends: 48 [2020-07-21 11:00:35,937 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:00:35,939 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 11:00:35,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:00:35,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 11:00:35,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 11:00:35,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 11:00:35,948 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 11:00:35,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:00:35,948 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 11:00:35,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:00:35,949 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 11:00:35,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:00:35,950 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:00:35,950 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 11:00:36,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:36,155 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:00:36,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:00:36,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 11:00:36,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:00:36,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209672065] [2020-07-21 11:00:36,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:00:36,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:00:36,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:00:36,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:00:36,283 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 11:00:36,283 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:00:36,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209672065] [2020-07-21 11:00:36,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:00:36,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 11:00:36,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079648483] [2020-07-21 11:00:36,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:00:36,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:00:36,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:00:36,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:00:36,287 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 8 states. [2020-07-21 11:00:36,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:00:36,400 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 11:00:36,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:00:36,402 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 11:00:36,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:00:36,403 INFO L225 Difference]: With dead ends: 52 [2020-07-21 11:00:36,404 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 11:00:36,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 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 11:00:36,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 11:00:36,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-07-21 11:00:36,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 11:00:36,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 11:00:36,427 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2020-07-21 11:00:36,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:00:36,428 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 11:00:36,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:00:36,428 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 11:00:36,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:00:36,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:00:36,432 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 11:00:36,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:36,648 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:00:36,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:00:36,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 11:00:36,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:00:36,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495265003] [2020-07-21 11:00:36,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:00:36,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:00:36,678 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:00:36,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:00:36,689 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:00:36,708 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:00:36,708 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:00:36,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:00:36,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:00:36 BoogieIcfgContainer [2020-07-21 11:00:36,983 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:00:36,988 INFO L168 Benchmark]: Toolchain (without parser) took 3506.94 ms. Allocated memory was 137.4 MB in the beginning and 232.8 MB in the end (delta: 95.4 MB). Free memory was 102.2 MB in the beginning and 188.7 MB in the end (delta: -86.5 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:00:36,990 INFO L168 Benchmark]: CDTParser took 0.43 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 11:00:36,997 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.15 ms. Allocated memory is still 137.4 MB. Free memory was 101.8 MB in the beginning and 92.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 11:00:36,999 INFO L168 Benchmark]: Boogie Preprocessor took 27.94 ms. Allocated memory is still 137.4 MB. Free memory was 92.5 MB in the beginning and 90.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2020-07-21 11:00:37,001 INFO L168 Benchmark]: RCFGBuilder took 449.11 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.9 MB in the beginning and 168.4 MB in the end (delta: -77.5 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 11:00:37,002 INFO L168 Benchmark]: TraceAbstraction took 2762.17 ms. Allocated memory was 201.9 MB in the beginning and 232.8 MB in the end (delta: 30.9 MB). Free memory was 167.7 MB in the beginning and 188.7 MB in the end (delta: -21.0 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:00:37,014 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.43 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.15 ms. Allocated memory is still 137.4 MB. Free memory was 101.8 MB in the beginning and 92.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.94 ms. Allocated memory is still 137.4 MB. Free memory was 92.5 MB in the beginning and 90.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 449.11 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.9 MB in the beginning and 168.4 MB in the end (delta: -77.5 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2762.17 ms. Allocated memory was 201.9 MB in the beginning and 232.8 MB in the end (delta: 30.9 MB). Free memory was 167.7 MB in the beginning and 188.7 MB in the end (delta: -21.0 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 25]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L22] unsigned int input = __VERIFIER_nondet_uint(); [L23] CALL, EXPR id(input) VAL [\old(x)=2] [L8] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L15] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L16] CALL, EXPR id(x-1) VAL [\old(x)=0] [L8] COND TRUE x==0 [L8] return 0; VAL [\old(x)=0, \result=0, x=0] [L16] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L16] unsigned int ret = id(x-1) + 1; [L17] COND FALSE !(ret > 3) [L18] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L9] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L9] unsigned int ret = id2(x-1) + 1; [L10] COND FALSE !(ret > 3) [L11] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L23] RET, EXPR id(input) VAL [id(input)=2, input=2] [L23] unsigned int result = id(input); [L24] COND TRUE result == 2 VAL [input=2, result=2] [L25] __VERIFIER_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.6s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 143 SDtfs, 12 SDslu, 562 SDs, 0 SdLazy, 95 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 104 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred in iteration=5, 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, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 134 NumberOfCodeBlocks, 134 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 102 ConstructedInterpolants, 0 QuantifiedInterpolants, 3394 SizeOfPredicates, 7 NumberOfNonLiveVariables, 240 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 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...