/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_i25_o25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 18:51:41,429 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 18:51:41,432 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 18:51:41,472 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 18:51:41,473 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 18:51:41,480 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 18:51:41,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 18:51:41,488 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 18:51:41,490 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 18:51:41,493 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 18:51:41,494 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 18:51:41,495 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 18:51:41,495 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 18:51:41,498 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 18:51:41,500 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 18:51:41,501 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 18:51:41,503 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 18:51:41,504 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 18:51:41,505 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 18:51:41,513 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 18:51:41,515 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 18:51:41,515 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 18:51:41,516 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 18:51:41,517 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 18:51:41,528 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 18:51:41,544 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 18:51:41,544 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 18:51:41,545 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 18:51:41,548 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 18:51:41,562 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 18:51:41,562 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 18:51:41,563 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 18:51:41,564 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 18:51:41,564 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 18:51:41,564 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 18:51:41,564 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 18:51:41,565 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 18:51:41,565 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 18:51:41,565 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 18:51:41,566 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 18:51:41,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 18:51:41,566 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 18:51:41,567 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 18:51:41,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 18:51:41,567 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 18:51:41,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 18:51:41,568 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 18:51:41,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 18:51:41,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 18:51:41,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 18:51:41,569 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 18:51:41,569 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 18:51:41,849 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 18:51:41,864 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 18:51:41,867 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 18:51:41,869 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 18:51:41,871 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 18:51:41,872 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i25_o25-2.c [2020-08-22 18:51:41,938 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/17853a679/19be6e9f7b414f2286cfff895012604c/FLAGda44d0c04 [2020-08-22 18:51:42,345 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 18:51:42,346 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i25_o25-2.c [2020-08-22 18:51:42,352 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/17853a679/19be6e9f7b414f2286cfff895012604c/FLAGda44d0c04 [2020-08-22 18:51:42,715 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/17853a679/19be6e9f7b414f2286cfff895012604c [2020-08-22 18:51:42,726 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 18:51:42,727 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 18:51:42,732 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 18:51:42,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 18:51:42,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 18:51:42,736 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a2f7fab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42, skipping insertion in model container [2020-08-22 18:51:42,740 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,749 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 18:51:42,767 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 18:51:42,925 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:51:42,930 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 18:51:42,944 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:51:42,956 INFO L208 MainTranslator]: Completed translation [2020-08-22 18:51:42,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42 WrapperNode [2020-08-22 18:51:42,957 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 18:51:42,958 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 18:51:42,958 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 18:51:42,958 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 18:51:42,968 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,968 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,972 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,972 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,975 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,977 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (1/1) ... [2020-08-22 18:51:42,979 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 18:51:42,979 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 18:51:42,979 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 18:51:42,979 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 18:51:42,980 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (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 18:51:43,142 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 18:51:43,143 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 18:51:43,143 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-22 18:51:43,143 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 18:51:43,143 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 18:51:43,143 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 18:51:43,143 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-22 18:51:43,143 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 18:51:43,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 18:51:43,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 18:51:43,313 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 18:51:43,314 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 18:51:43,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:51:43 BoogieIcfgContainer [2020-08-22 18:51:43,318 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 18:51:43,320 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 18:51:43,320 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 18:51:43,323 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 18:51:43,323 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:51:42" (1/3) ... [2020-08-22 18:51:43,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10833c05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:51:43, skipping insertion in model container [2020-08-22 18:51:43,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:51:42" (2/3) ... [2020-08-22 18:51:43,325 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10833c05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:51:43, skipping insertion in model container [2020-08-22 18:51:43,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:51:43" (3/3) ... [2020-08-22 18:51:43,327 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i25_o25-2.c [2020-08-22 18:51:43,338 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 18:51:43,346 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 18:51:43,362 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 18:51:43,391 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 18:51:43,391 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 18:51:43,391 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 18:51:43,391 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 18:51:43,391 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 18:51:43,392 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 18:51:43,392 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 18:51:43,392 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 18:51:43,410 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-22 18:51:43,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 18:51:43,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:51:43,425 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 18:51:43,426 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:51:43,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:51:43,434 INFO L82 PathProgramCache]: Analyzing trace with hash 1037734449, now seen corresponding path program 1 times [2020-08-22 18:51:43,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:51:43,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [153515597] [2020-08-22 18:51:43,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:51:43,520 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 18:51:43,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:51:43,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 18:51:43,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:51:43,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 18:51:43,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:51:43,663 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 18:51:43,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [153515597] [2020-08-22 18:51:43,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 18:51:43,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 18:51:43,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325664727] [2020-08-22 18:51:43,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 18:51:43,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 18:51:43,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 18:51:43,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 18:51:43,693 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2020-08-22 18:51:43,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 18:51:43,796 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-22 18:51:43,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 18:51:43,799 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-22 18:51:43,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 18:51:43,813 INFO L225 Difference]: With dead ends: 37 [2020-08-22 18:51:43,814 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 18:51:43,819 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 18:51:43,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 18:51:43,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 18:51:43,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 18:51:43,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-22 18:51:43,866 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 16 [2020-08-22 18:51:43,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 18:51:43,867 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-22 18:51:43,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 18:51:43,868 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-22 18:51:43,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 18:51:43,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:51:43,870 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] [2020-08-22 18:51:43,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 18:51:43,871 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:51:43,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:51:43,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1478812441, now seen corresponding path program 1 times [2020-08-22 18:51:43,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:51:43,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919381354] [2020-08-22 18:51:43,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY