/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 22:09:09,303 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 22:09:09,306 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 22:09:09,331 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 22:09:09,332 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 22:09:09,333 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 22:09:09,335 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 22:09:09,336 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 22:09:09,338 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 22:09:09,339 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 22:09:09,340 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 22:09:09,341 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 22:09:09,341 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 22:09:09,342 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 22:09:09,343 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 22:09:09,344 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 22:09:09,345 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 22:09:09,346 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 22:09:09,348 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 22:09:09,350 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 22:09:09,351 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 22:09:09,352 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 22:09:09,354 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 22:09:09,354 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 22:09:09,357 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 22:09:09,364 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 22:09:09,365 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 22:09:09,366 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 22:09:09,367 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 22:09:09,378 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 22:09:09,378 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 22:09:09,379 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 22:09:09,380 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 22:09:09,380 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 22:09:09,380 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 22:09:09,380 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 22:09:09,380 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 22:09:09,380 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 22:09:09,381 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 22:09:09,381 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 22:09:09,381 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 22:09:09,381 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 22:09:09,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 22:09:09,382 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 22:09:09,382 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 22:09:09,382 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 22:09:09,382 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 22:09:09,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:09:09,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 22:09:09,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 22:09:09,383 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 22:09:09,383 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 22:09:09,702 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 22:09:09,722 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 22:09:09,726 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 22:09:09,729 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 22:09:09,730 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 22:09:09,731 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-08-22 22:09:09,814 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12590bcf0/32e3d892140046ec8b79cce487c97fc1/FLAGdf84ac290 [2020-08-22 22:09:10,373 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 22:09:10,374 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-08-22 22:09:10,382 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12590bcf0/32e3d892140046ec8b79cce487c97fc1/FLAGdf84ac290 [2020-08-22 22:09:10,734 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12590bcf0/32e3d892140046ec8b79cce487c97fc1 [2020-08-22 22:09:10,750 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 22:09:10,754 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 22:09:10,758 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 22:09:10,758 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 22:09:10,762 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 22:09:10,763 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:09:10" (1/1) ... [2020-08-22 22:09:10,767 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2720981c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:10, skipping insertion in model container [2020-08-22 22:09:10,768 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:09:10" (1/1) ... [2020-08-22 22:09:10,777 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 22:09:10,796 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 22:09:10,997 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:09:11,001 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 22:09:11,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:09:11,031 INFO L208 MainTranslator]: Completed translation [2020-08-22 22:09:11,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11 WrapperNode [2020-08-22 22:09:11,032 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 22:09:11,033 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 22:09:11,033 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 22:09:11,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 22:09:11,045 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,046 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,051 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,054 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,058 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (1/1) ... [2020-08-22 22:09:11,059 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 22:09:11,060 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 22:09:11,060 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 22:09:11,060 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 22:09:11,061 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (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 [2020-08-22 22:09:11,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 22:09:11,236 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 22:09:11,236 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-08-22 22:09:11,236 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 22:09:11,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 22:09:11,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 22:09:11,236 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-08-22 22:09:11,236 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 22:09:11,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 22:09:11,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 22:09:11,445 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 22:09:11,445 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 22:09:11,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:09:11 BoogieIcfgContainer [2020-08-22 22:09:11,451 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 22:09:11,452 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 22:09:11,453 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 22:09:11,457 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 22:09:11,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 10:09:10" (1/3) ... [2020-08-22 22:09:11,458 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c405293 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:09:11, skipping insertion in model container [2020-08-22 22:09:11,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:09:11" (2/3) ... [2020-08-22 22:09:11,459 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c405293 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:09:11, skipping insertion in model container [2020-08-22 22:09:11,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:09:11" (3/3) ... [2020-08-22 22:09:11,461 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-08-22 22:09:11,474 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 22:09:11,482 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 22:09:11,497 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 22:09:11,522 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 22:09:11,523 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 22:09:11,523 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 22:09:11,523 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 22:09:11,523 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 22:09:11,524 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 22:09:11,524 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 22:09:11,524 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 22:09:11,540 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2020-08-22 22:09:11,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 22:09:11,552 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:11,553 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:11,554 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:11,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:11,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1756383024, now seen corresponding path program 1 times [2020-08-22 22:09:11,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:11,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822784098] [2020-08-22 22:09:11,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:11,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:11,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:11,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:11,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:11,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:09:11,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822784098] [2020-08-22 22:09:11,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:09:11,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:09:11,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947042970] [2020-08-22 22:09:11,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:09:11,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:11,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:09:11,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:09:11,831 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 5 states. [2020-08-22 22:09:11,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:11,956 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2020-08-22 22:09:11,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:09:11,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-22 22:09:11,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:11,970 INFO L225 Difference]: With dead ends: 44 [2020-08-22 22:09:11,970 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 22:09:11,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:09:11,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 22:09:12,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 22:09:12,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 22:09:12,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-22 22:09:12,027 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 16 [2020-08-22 22:09:12,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:12,027 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-22 22:09:12,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:09:12,028 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-22 22:09:12,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 22:09:12,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:12,031 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:12,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 22:09:12,032 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:12,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:12,033 INFO L82 PathProgramCache]: Analyzing trace with hash -389703589, now seen corresponding path program 1 times [2020-08-22 22:09:12,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:12,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373521145] [2020-08-22 22:09:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:12,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:12,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:12,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:09:12,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373521145] [2020-08-22 22:09:12,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:09:12,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:09:12,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618214349] [2020-08-22 22:09:12,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:09:12,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:12,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:09:12,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:09:12,120 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 5 states. [2020-08-22 22:09:12,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:12,212 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-08-22 22:09:12,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:09:12,213 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 22:09:12,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:12,215 INFO L225 Difference]: With dead ends: 36 [2020-08-22 22:09:12,215 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 22:09:12,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:09:12,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 22:09:12,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-08-22 22:09:12,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 22:09:12,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-22 22:09:12,230 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 17 [2020-08-22 22:09:12,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:12,231 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-22 22:09:12,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:09:12,231 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-22 22:09:12,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 22:09:12,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:12,233 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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] [2020-08-22 22:09:12,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 22:09:12,234 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:12,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:12,235 INFO L82 PathProgramCache]: Analyzing trace with hash 50309368, now seen corresponding path program 1 times [2020-08-22 22:09:12,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:12,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582320896] [2020-08-22 22:09:12,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:12,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:12,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:12,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:12,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 22:09:12,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,463 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 22:09:12,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582320896] [2020-08-22 22:09:12,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:09:12,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 22:09:12,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388517675] [2020-08-22 22:09:12,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 22:09:12,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:12,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 22:09:12,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:09:12,467 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2020-08-22 22:09:12,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:12,588 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2020-08-22 22:09:12,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 22:09:12,589 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-08-22 22:09:12,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:12,591 INFO L225 Difference]: With dead ends: 52 [2020-08-22 22:09:12,591 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 22:09:12,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-22 22:09:12,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 22:09:12,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 22:09:12,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 22:09:12,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-08-22 22:09:12,606 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 33 [2020-08-22 22:09:12,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:12,607 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-08-22 22:09:12,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 22:09:12,607 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-08-22 22:09:12,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 22:09:12,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:12,610 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:12,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 22:09:12,610 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:12,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:12,611 INFO L82 PathProgramCache]: Analyzing trace with hash -643371531, now seen corresponding path program 1 times [2020-08-22 22:09:12,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:12,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054095538] [2020-08-22 22:09:12,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:12,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:12,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:12,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:12,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:12,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,735 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 22:09:12,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054095538] [2020-08-22 22:09:12,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:09:12,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 22:09:12,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409811492] [2020-08-22 22:09:12,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 22:09:12,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:12,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 22:09:12,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:09:12,740 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 6 states. [2020-08-22 22:09:12,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:12,888 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2020-08-22 22:09:12,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 22:09:12,889 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2020-08-22 22:09:12,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:12,892 INFO L225 Difference]: With dead ends: 56 [2020-08-22 22:09:12,892 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 22:09:12,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:09:12,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 22:09:12,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-22 22:09:12,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 22:09:12,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2020-08-22 22:09:12,920 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 34 [2020-08-22 22:09:12,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:12,921 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2020-08-22 22:09:12,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 22:09:12,921 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2020-08-22 22:09:12,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 22:09:12,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:12,926 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:12,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 22:09:12,928 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:12,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:12,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1274787059, now seen corresponding path program 2 times [2020-08-22 22:09:12,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:12,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912085937] [2020-08-22 22:09:12,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:12,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:12,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:13,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:13,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:13,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:09:13,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,126 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-22 22:09:13,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912085937] [2020-08-22 22:09:13,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:09:13,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 22:09:13,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174677473] [2020-08-22 22:09:13,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 22:09:13,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:13,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 22:09:13,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:09:13,130 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand 8 states. [2020-08-22 22:09:13,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:13,284 INFO L93 Difference]: Finished difference Result 111 states and 156 transitions. [2020-08-22 22:09:13,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 22:09:13,285 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2020-08-22 22:09:13,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:13,288 INFO L225 Difference]: With dead ends: 111 [2020-08-22 22:09:13,289 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 22:09:13,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-22 22:09:13,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 22:09:13,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 55. [2020-08-22 22:09:13,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 22:09:13,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-22 22:09:13,311 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-22 22:09:13,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:13,312 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-22 22:09:13,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 22:09:13,312 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-22 22:09:13,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 22:09:13,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:13,315 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:13,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 22:09:13,316 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:13,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:13,316 INFO L82 PathProgramCache]: Analyzing trace with hash 99184320, now seen corresponding path program 3 times [2020-08-22 22:09:13,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:13,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449276723] [2020-08-22 22:09:13,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:13,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:13,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:13,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:13,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:09:13,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,442 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-22 22:09:13,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449276723] [2020-08-22 22:09:13,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:09:13,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 22:09:13,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25034096] [2020-08-22 22:09:13,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 22:09:13,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:13,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 22:09:13,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:09:13,445 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 7 states. [2020-08-22 22:09:13,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:13,571 INFO L93 Difference]: Finished difference Result 89 states and 117 transitions. [2020-08-22 22:09:13,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 22:09:13,572 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 52 [2020-08-22 22:09:13,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:13,575 INFO L225 Difference]: With dead ends: 89 [2020-08-22 22:09:13,575 INFO L226 Difference]: Without dead ends: 83 [2020-08-22 22:09:13,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-22 22:09:13,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-22 22:09:13,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 77. [2020-08-22 22:09:13,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-22 22:09:13,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 103 transitions. [2020-08-22 22:09:13,600 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 103 transitions. Word has length 52 [2020-08-22 22:09:13,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:13,601 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 103 transitions. [2020-08-22 22:09:13,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 22:09:13,601 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 103 transitions. [2020-08-22 22:09:13,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-22 22:09:13,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:13,606 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:13,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 22:09:13,606 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:13,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:13,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1883941443, now seen corresponding path program 4 times [2020-08-22 22:09:13,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:13,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109146350] [2020-08-22 22:09:13,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:13,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:13,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:13,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:09:13,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 22:09:13,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:13,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:13,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:09:13,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:13,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 22:09:13,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,037 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 130 proven. 176 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2020-08-22 22:09:14,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109146350] [2020-08-22 22:09:14,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:09:14,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 22:09:14,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470829282] [2020-08-22 22:09:14,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 22:09:14,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:14,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 22:09:14,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-08-22 22:09:14,041 INFO L87 Difference]: Start difference. First operand 77 states and 103 transitions. Second operand 11 states. [2020-08-22 22:09:14,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:14,395 INFO L93 Difference]: Finished difference Result 142 states and 213 transitions. [2020-08-22 22:09:14,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 22:09:14,396 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 123 [2020-08-22 22:09:14,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:14,401 INFO L225 Difference]: With dead ends: 142 [2020-08-22 22:09:14,401 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 22:09:14,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=344, Unknown=0, NotChecked=0, Total=462 [2020-08-22 22:09:14,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 22:09:14,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-22 22:09:14,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 22:09:14,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2020-08-22 22:09:14,420 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 123 [2020-08-22 22:09:14,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:14,421 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2020-08-22 22:09:14,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 22:09:14,421 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2020-08-22 22:09:14,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2020-08-22 22:09:14,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:14,423 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:14,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 22:09:14,424 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:14,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:14,425 INFO L82 PathProgramCache]: Analyzing trace with hash 532445701, now seen corresponding path program 5 times [2020-08-22 22:09:14,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:14,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420684799] [2020-08-22 22:09:14,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:14,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:09:14,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:09:14,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:14,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:09:14,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 22:09:14,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:14,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-22 22:09:14,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:14,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:14,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:15,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:15,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:15,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 22:09:15,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 22:09:15,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:09:15,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 22:09:15,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-22 22:09:15,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:09:15,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1318 backedges. 375 proven. 413 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2020-08-22 22:09:15,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420684799] [2020-08-22 22:09:15,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:09:15,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 22:09:15,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499338830] [2020-08-22 22:09:15,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 22:09:15,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:09:15,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 22:09:15,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-22 22:09:15,166 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand 13 states. [2020-08-22 22:09:15,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:09:15,653 INFO L93 Difference]: Finished difference Result 149 states and 204 transitions. [2020-08-22 22:09:15,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 22:09:15,654 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 193 [2020-08-22 22:09:15,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:09:15,658 INFO L225 Difference]: With dead ends: 149 [2020-08-22 22:09:15,658 INFO L226 Difference]: Without dead ends: 92 [2020-08-22 22:09:15,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=176, Invalid=580, Unknown=0, NotChecked=0, Total=756 [2020-08-22 22:09:15,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-22 22:09:15,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 79. [2020-08-22 22:09:15,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-22 22:09:15,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2020-08-22 22:09:15,677 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 193 [2020-08-22 22:09:15,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:09:15,678 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2020-08-22 22:09:15,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 22:09:15,678 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2020-08-22 22:09:15,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-08-22 22:09:15,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:09:15,680 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:09:15,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 22:09:15,681 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:09:15,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:09:15,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1618484333, now seen corresponding path program 6 times [2020-08-22 22:09:15,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:09:15,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251665217] [2020-08-22 22:09:15,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:09:15,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:09:15,703 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:09:15,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:09:15,720 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:09:15,754 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 22:09:15,755 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 22:09:15,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 22:09:15,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 10:09:15 BoogieIcfgContainer [2020-08-22 22:09:15,824 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 22:09:15,831 INFO L168 Benchmark]: Toolchain (without parser) took 5073.72 ms. Allocated memory was 136.3 MB in the beginning and 311.4 MB in the end (delta: 175.1 MB). Free memory was 100.7 MB in the beginning and 172.8 MB in the end (delta: -72.1 MB). Peak memory consumption was 103.0 MB. Max. memory is 7.1 GB. [2020-08-22 22:09:15,832 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 136.3 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 22:09:15,832 INFO L168 Benchmark]: CACSL2BoogieTranslator took 274.16 ms. Allocated memory is still 136.3 MB. Free memory was 100.5 MB in the beginning and 91.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-22 22:09:15,835 INFO L168 Benchmark]: Boogie Preprocessor took 26.60 ms. Allocated memory is still 136.3 MB. Free memory was 91.2 MB in the beginning and 89.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-22 22:09:15,837 INFO L168 Benchmark]: RCFGBuilder took 390.87 ms. Allocated memory was 136.3 MB in the beginning and 199.2 MB in the end (delta: 62.9 MB). Free memory was 89.8 MB in the beginning and 166.4 MB in the end (delta: -76.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-22 22:09:15,838 INFO L168 Benchmark]: TraceAbstraction took 4372.18 ms. Allocated memory was 199.2 MB in the beginning and 311.4 MB in the end (delta: 112.2 MB). Free memory was 165.7 MB in the beginning and 172.8 MB in the end (delta: -7.1 MB). Peak memory consumption was 105.1 MB. Max. memory is 7.1 GB. [2020-08-22 22:09:15,847 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 136.3 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 274.16 ms. Allocated memory is still 136.3 MB. Free memory was 100.5 MB in the beginning and 91.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.60 ms. Allocated memory is still 136.3 MB. Free memory was 91.2 MB in the beginning and 89.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 390.87 ms. Allocated memory was 136.3 MB in the beginning and 199.2 MB in the end (delta: 62.9 MB). Free memory was 89.8 MB in the beginning and 166.4 MB in the end (delta: -76.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4372.18 ms. Allocated memory was 199.2 MB in the beginning and 311.4 MB in the end (delta: 112.2 MB). Free memory was 165.7 MB in the beginning and 172.8 MB in the end (delta: -7.1 MB). Peak memory consumption was 105.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 5; VAL [x=5] [L25] CALL, EXPR fibo(x) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=2, \result=1, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=3, \result=2, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=2, \result=1, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=4, \result=3, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=2, \result=1, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=3, \result=2, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); VAL [\old(n)=5, \result=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L25] RET, EXPR fibo(x) VAL [fibo(x)=5, x=5] [L25] int result = fibo(x); VAL [fibo(x)=5, result=5, x=5] [L26] COND TRUE result == 5 VAL [result=5, x=5] [L27] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.2s, OverallIterations: 9, TraceHistogramMax: 21, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 229 SDtfs, 384 SDslu, 651 SDs, 0 SdLazy, 650 SolverSat, 165 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 232 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=79occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 36 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.8s InterpolantComputationTime, 659 NumberOfCodeBlocks, 659 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 511 ConstructedInterpolants, 0 QuantifiedInterpolants, 112687 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 1298/1932 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...