/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 -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_b3_o5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 16:29:04,290 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 16:29:04,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 16:29:04,342 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 16:29:04,343 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 16:29:04,352 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 16:29:04,355 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 16:29:04,360 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 16:29:04,362 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 16:29:04,366 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 16:29:04,367 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 16:29:04,368 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 16:29:04,368 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 16:29:04,371 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 16:29:04,374 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 16:29:04,376 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 16:29:04,378 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 16:29:04,380 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 16:29:04,382 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 16:29:04,390 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 16:29:04,393 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 16:29:04,394 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 16:29:04,395 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 16:29:04,396 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 16:29:04,414 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 16:29:04,430 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 16:29:04,431 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 16:29:04,432 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 16:29:04,434 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 16:29:04,448 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 16:29:04,448 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 16:29:04,451 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 16:29:04,451 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 16:29:04,451 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 16:29:04,451 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 16:29:04,452 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 16:29:04,452 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 16:29:04,452 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 16:29:04,452 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 16:29:04,453 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 16:29:04,453 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 16:29:04,454 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 16:29:04,454 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 16:29:04,454 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 16:29:04,455 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 16:29:04,455 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 16:29:04,455 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 16:29:04,455 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:29:04,455 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 16:29:04,456 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 16:29:04,456 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 16:29:04,456 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 16:29:04,955 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 16:29:04,974 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 16:29:04,979 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 16:29:04,981 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 16:29:04,982 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 16:29:04,983 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_b3_o5-2.c [2020-09-04 16:29:05,081 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/64ee8c30f/1ca755cdc11e4f21b500000664211fe8/FLAG00b24459a [2020-09-04 16:29:05,664 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 16:29:05,665 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_b3_o5-2.c [2020-09-04 16:29:05,674 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/64ee8c30f/1ca755cdc11e4f21b500000664211fe8/FLAG00b24459a [2020-09-04 16:29:06,003 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/64ee8c30f/1ca755cdc11e4f21b500000664211fe8 [2020-09-04 16:29:06,019 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 16:29:06,021 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 16:29:06,023 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 16:29:06,023 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 16:29:06,031 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 16:29:06,032 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,037 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45aac576 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06, skipping insertion in model container [2020-09-04 16:29:06,037 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,046 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 16:29:06,071 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 16:29:06,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:29:06,292 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 16:29:06,313 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:29:06,333 INFO L208 MainTranslator]: Completed translation [2020-09-04 16:29:06,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06 WrapperNode [2020-09-04 16:29:06,333 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 16:29:06,334 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 16:29:06,335 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 16:29:06,335 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 16:29:06,352 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,352 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,457 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,457 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,464 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,467 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,468 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... [2020-09-04 16:29:06,472 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 16:29:06,472 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 16:29:06,473 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 16:29:06,473 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 16:29:06,474 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 16:29:06,557 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 16:29:06,557 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 16:29:06,558 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-09-04 16:29:06,558 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 16:29:06,558 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 16:29:06,558 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 16:29:06,558 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-09-04 16:29:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 16:29:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 16:29:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 16:29:06,780 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 16:29:06,781 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 16:29:06,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:29:06 BoogieIcfgContainer [2020-09-04 16:29:06,786 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 16:29:06,788 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 16:29:06,788 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 16:29:06,792 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 16:29:06,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 04:29:06" (1/3) ... [2020-09-04 16:29:06,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34cea6a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:29:06, skipping insertion in model container [2020-09-04 16:29:06,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:29:06" (2/3) ... [2020-09-04 16:29:06,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34cea6a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:29:06, skipping insertion in model container [2020-09-04 16:29:06,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:29:06" (3/3) ... [2020-09-04 16:29:06,797 INFO L109 eAbstractionObserver]: Analyzing ICFG id_b3_o5-2.c [2020-09-04 16:29:06,810 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 16:29:06,830 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 16:29:06,882 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 16:29:06,939 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 16:29:06,939 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 16:29:06,939 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 16:29:06,939 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 16:29:06,940 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 16:29:06,940 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 16:29:06,940 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 16:29:06,940 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 16:29:06,966 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-09-04 16:29:06,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-04 16:29:06,981 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:29:06,982 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:29:06,982 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:29:06,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:29:06,989 INFO L82 PathProgramCache]: Analyzing trace with hash 856871792, now seen corresponding path program 1 times [2020-09-04 16:29:06,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:29:06,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016584588] [2020-09-04 16:29:06,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:29:07,070 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:29:07,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:29:07,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 16:29:07,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:29:07,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016584588] [2020-09-04 16:29:07,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:29:07,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:29:07,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454049482] [2020-09-04 16:29:07,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:29:07,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:29:07,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:29:07,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:29:07,279 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-09-04 16:29:07,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:29:07,381 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2020-09-04 16:29:07,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 16:29:07,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-09-04 16:29:07,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:29:07,396 INFO L225 Difference]: With dead ends: 44 [2020-09-04 16:29:07,396 INFO L226 Difference]: Without dead ends: 28 [2020-09-04 16:29:07,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:29:07,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-04 16:29:07,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-04 16:29:07,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-04 16:29:07,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-09-04 16:29:07,453 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 18 [2020-09-04 16:29:07,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:29:07,454 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-09-04 16:29:07,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:29:07,454 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-09-04 16:29:07,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-04 16:29:07,457 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:29:07,457 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, 1] [2020-09-04 16:29:07,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 16:29:07,458 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:29:07,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:29:07,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1774609951, now seen corresponding path program 1 times [2020-09-04 16:29:07,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:29:07,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880660467] [2020-09-04 16:29:07,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:29:07,462 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:29:07,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:29:07,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 16:29:07,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:07,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 16:29:07,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880660467] [2020-09-04 16:29:07,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:29:07,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:29:07,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231790454] [2020-09-04 16:29:07,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:29:07,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:29:07,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:29:07,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:29:07,611 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 5 states. [2020-09-04 16:29:07,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:29:07,671 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-09-04 16:29:07,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 16:29:07,672 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-09-04 16:29:07,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:29:07,674 INFO L225 Difference]: With dead ends: 49 [2020-09-04 16:29:07,674 INFO L226 Difference]: Without dead ends: 35 [2020-09-04 16:29:07,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:29:07,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-04 16:29:07,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-09-04 16:29:07,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 16:29:07,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-04 16:29:07,688 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 28 [2020-09-04 16:29:07,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:29:07,688 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-04 16:29:07,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:29:07,689 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-04 16:29:07,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-04 16:29:07,690 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:29:07,690 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, 1] [2020-09-04 16:29:07,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 16:29:07,691 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:29:07,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:29:07,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1645321695, now seen corresponding path program 1 times [2020-09-04 16:29:07,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:29:07,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440836482] [2020-09-04 16:29:07,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:29:07,695 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:29:07,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:29:07,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 16:29:07,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:07,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:07,847 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 16:29:07,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440836482] [2020-09-04 16:29:07,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:29:07,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 16:29:07,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677618757] [2020-09-04 16:29:07,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 16:29:07,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:29:07,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 16:29:07,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:29:07,852 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2020-09-04 16:29:07,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:29:07,955 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2020-09-04 16:29:07,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 16:29:07,955 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-09-04 16:29:07,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:29:07,957 INFO L225 Difference]: With dead ends: 41 [2020-09-04 16:29:07,958 INFO L226 Difference]: Without dead ends: 35 [2020-09-04 16:29:07,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:29:07,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-04 16:29:07,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-09-04 16:29:07,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-04 16:29:07,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-09-04 16:29:07,969 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2020-09-04 16:29:07,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:29:07,970 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-09-04 16:29:07,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 16:29:07,970 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-09-04 16:29:07,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-04 16:29:07,972 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:29:07,972 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:29:07,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 16:29:07,973 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:29:07,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:29:07,974 INFO L82 PathProgramCache]: Analyzing trace with hash 170302224, now seen corresponding path program 1 times [2020-09-04 16:29:07,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:29:07,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806377777] [2020-09-04 16:29:07,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:29:07,977 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:29:08,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:29:08,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 16:29:08,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,145 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-04 16:29:08,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806377777] [2020-09-04 16:29:08,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:29:08,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:29:08,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65051946] [2020-09-04 16:29:08,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:29:08,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:29:08,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:29:08,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:29:08,148 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 5 states. [2020-09-04 16:29:08,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:29:08,185 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2020-09-04 16:29:08,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 16:29:08,186 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-09-04 16:29:08,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:29:08,199 INFO L225 Difference]: With dead ends: 43 [2020-09-04 16:29:08,199 INFO L226 Difference]: Without dead ends: 37 [2020-09-04 16:29:08,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:29:08,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-04 16:29:08,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-09-04 16:29:08,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-04 16:29:08,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-09-04 16:29:08,208 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 38 [2020-09-04 16:29:08,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:29:08,208 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-09-04 16:29:08,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:29:08,209 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-09-04 16:29:08,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-04 16:29:08,210 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:29:08,211 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:29:08,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 16:29:08,211 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:29:08,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:29:08,212 INFO L82 PathProgramCache]: Analyzing trace with hash 41013968, now seen corresponding path program 2 times [2020-09-04 16:29:08,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:29:08,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578553320] [2020-09-04 16:29:08,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:29:08,215 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:29:08,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:29:08,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 16:29:08,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,461 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-04 16:29:08,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578553320] [2020-09-04 16:29:08,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:29:08,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-09-04 16:29:08,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805245692] [2020-09-04 16:29:08,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 16:29:08,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:29:08,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 16:29:08,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:29:08,465 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 11 states. [2020-09-04 16:29:08,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:29:08,620 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2020-09-04 16:29:08,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 16:29:08,621 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2020-09-04 16:29:08,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:29:08,622 INFO L225 Difference]: With dead ends: 64 [2020-09-04 16:29:08,623 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 16:29:08,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2020-09-04 16:29:08,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 16:29:08,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 16:29:08,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 16:29:08,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-09-04 16:29:08,635 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 38 [2020-09-04 16:29:08,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:29:08,635 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-09-04 16:29:08,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 16:29:08,636 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-09-04 16:29:08,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-04 16:29:08,637 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:29:08,638 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:29:08,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 16:29:08,639 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:29:08,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:29:08,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1045014785, now seen corresponding path program 3 times [2020-09-04 16:29:08,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:29:08,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701832278] [2020-09-04 16:29:08,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:29:08,643 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:29:08,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:29:08,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 16:29:08,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:29:08,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:29:08,911 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-09-04 16:29:08,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701832278] [2020-09-04 16:29:08,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:29:08,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2020-09-04 16:29:08,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995646276] [2020-09-04 16:29:08,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-04 16:29:08,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:29:08,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-04 16:29:08,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-09-04 16:29:08,914 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 14 states. [2020-09-04 16:29:09,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:29:09,088 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-09-04 16:29:09,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-04 16:29:09,088 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2020-09-04 16:29:09,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:29:09,093 INFO L225 Difference]: With dead ends: 62 [2020-09-04 16:29:09,093 INFO L226 Difference]: Without dead ends: 0 [2020-09-04 16:29:09,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2020-09-04 16:29:09,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-09-04 16:29:09,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-09-04 16:29:09,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-09-04 16:29:09,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-09-04 16:29:09,096 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-09-04 16:29:09,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:29:09,096 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-09-04 16:29:09,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-04 16:29:09,096 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-09-04 16:29:09,097 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-09-04 16:29:09,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 16:29:09,100 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-09-04 16:29:09,379 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-09-04 16:29:09,380 INFO L271 CegarLoopResult]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2020-09-04 16:29:09,380 INFO L271 CegarLoopResult]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2020-09-04 16:29:09,380 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-09-04 16:29:09,380 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-09-04 16:29:09,381 INFO L271 CegarLoopResult]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2020-09-04 16:29:09,381 INFO L264 CegarLoopResult]: At program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 15) the Hoare annotation is: false [2020-09-04 16:29:09,381 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2020-09-04 16:29:09,381 INFO L271 CegarLoopResult]: At program point mainEXIT(lines 11 17) the Hoare annotation is: true [2020-09-04 16:29:09,381 INFO L264 CegarLoopResult]: At program point L15(line 15) the Hoare annotation is: false [2020-09-04 16:29:09,382 INFO L264 CegarLoopResult]: At program point L14(lines 14 16) the Hoare annotation is: (<= main_~result~0 3) [2020-09-04 16:29:09,382 INFO L271 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: true [2020-09-04 16:29:09,382 INFO L271 CegarLoopResult]: At program point L12(line 12) the Hoare annotation is: true [2020-09-04 16:29:09,382 INFO L264 CegarLoopResult]: At program point L13-1(line 13) the Hoare annotation is: (<= |main_#t~ret2| 3) [2020-09-04 16:29:09,382 INFO L271 CegarLoopResult]: At program point L14-2(lines 11 17) the Hoare annotation is: true [2020-09-04 16:29:09,383 INFO L271 CegarLoopResult]: At program point L12-1(line 12) the Hoare annotation is: true [2020-09-04 16:29:09,383 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (<= |main_#t~ret2| 3) [2020-09-04 16:29:09,383 INFO L264 CegarLoopResult]: At program point L13-3(line 13) the Hoare annotation is: (and (<= main_~result~0 3) (<= |main_#t~ret2| 3)) [2020-09-04 16:29:09,383 INFO L264 CegarLoopResult]: At program point idFINAL(lines 4 9) the Hoare annotation is: (<= |id_#res| 3) [2020-09-04 16:29:09,384 INFO L264 CegarLoopResult]: At program point idEXIT(lines 4 9) the Hoare annotation is: (<= |id_#res| 3) [2020-09-04 16:29:09,384 INFO L271 CegarLoopResult]: At program point idENTRY(lines 4 9) the Hoare annotation is: true [2020-09-04 16:29:09,384 INFO L264 CegarLoopResult]: At program point L8(line 8) the Hoare annotation is: (<= id_~ret~0 3) [2020-09-04 16:29:09,384 INFO L271 CegarLoopResult]: At program point L7(line 7) the Hoare annotation is: true [2020-09-04 16:29:09,384 INFO L271 CegarLoopResult]: At program point L6(line 6) the Hoare annotation is: true [2020-09-04 16:29:09,385 INFO L271 CegarLoopResult]: At program point L7-1(line 7) the Hoare annotation is: true [2020-09-04 16:29:09,385 INFO L271 CegarLoopResult]: At program point L5(line 5) the Hoare annotation is: true [2020-09-04 16:29:09,385 INFO L271 CegarLoopResult]: At program point L6-1(line 6) the Hoare annotation is: true [2020-09-04 16:29:09,385 INFO L271 CegarLoopResult]: At program point L5-1(line 5) the Hoare annotation is: true [2020-09-04 16:29:09,385 INFO L271 CegarLoopResult]: At program point L6-2(line 6) the Hoare annotation is: true [2020-09-04 16:29:09,386 INFO L271 CegarLoopResult]: At program point L6-3(line 6) the Hoare annotation is: true [2020-09-04 16:29:09,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 04:29:09 BoogieIcfgContainer [2020-09-04 16:29:09,410 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 16:29:09,413 INFO L168 Benchmark]: Toolchain (without parser) took 3390.93 ms. Allocated memory was 145.2 MB in the beginning and 234.9 MB in the end (delta: 89.7 MB). Free memory was 102.7 MB in the beginning and 86.9 MB in the end (delta: 15.8 MB). Peak memory consumption was 105.4 MB. Max. memory is 7.1 GB. [2020-09-04 16:29:09,414 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 145.2 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-04 16:29:09,415 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.30 ms. Allocated memory is still 145.2 MB. Free memory was 102.5 MB in the beginning and 93.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:29:09,416 INFO L168 Benchmark]: Boogie Preprocessor took 137.64 ms. Allocated memory was 145.2 MB in the beginning and 203.4 MB in the end (delta: 58.2 MB). Free memory was 93.2 MB in the beginning and 182.1 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-09-04 16:29:09,417 INFO L168 Benchmark]: RCFGBuilder took 314.27 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 169.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:29:09,418 INFO L168 Benchmark]: TraceAbstraction took 2621.80 ms. Allocated memory was 203.4 MB in the beginning and 234.9 MB in the end (delta: 31.5 MB). Free memory was 169.2 MB in the beginning and 86.9 MB in the end (delta: 82.2 MB). Peak memory consumption was 113.7 MB. Max. memory is 7.1 GB. [2020-09-04 16:29:09,422 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 145.2 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 311.30 ms. Allocated memory is still 145.2 MB. Free memory was 102.5 MB in the beginning and 93.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 137.64 ms. Allocated memory was 145.2 MB in the beginning and 203.4 MB in the end (delta: 58.2 MB). Free memory was 93.2 MB in the beginning and 182.1 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 314.27 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 169.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2621.80 ms. Allocated memory was 203.4 MB in the beginning and 234.9 MB in the end (delta: 31.5 MB). Free memory was 169.2 MB in the beginning and 86.9 MB in the end (delta: 82.2 MB). Peak memory consumption was 113.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 15]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - ProcedureContractResult [Line: 11]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 4]: Procedure Contract for id Derived contract for procedure id: \result <= 3 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 30 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.1s, OverallIterations: 6, TraceHistogramMax: 4, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 151 SDtfs, 32 SDslu, 674 SDs, 0 SdLazy, 219 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 109 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred 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, 6 MinimizatonAttempts, 7 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 30 LocationsWithAnnotation, 42 PreInvPairs, 134 NumberOfFragments, 48 HoareAnnotationTreeSize, 42 FomulaSimplifications, 282 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 30 FomulaSimplificationsInter, 133 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...