/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:36:02,897 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:36:02,901 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:36:02,942 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:36:02,943 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:36:02,951 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:36:02,955 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:36:02,959 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:36:02,962 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:36:02,965 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:36:02,966 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:36:02,966 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:36:02,967 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:36:02,969 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:36:02,972 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:36:02,973 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:36:02,975 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:36:02,976 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:36:02,977 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:36:02,986 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:36:02,988 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:36:02,989 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:36:02,990 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:36:02,991 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:36:03,004 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:36:03,025 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 16:36:03,061 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:36:03,061 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:36:03,063 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:36:03,063 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:36:03,063 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:36:03,063 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:36:03,064 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:36:03,064 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:36:03,064 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:36:03,064 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:36:03,065 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:36:03,065 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:36:03,066 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:36:03,066 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:36:03,066 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:36:03,066 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:36:03,067 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:36:03,067 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:36:03,067 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:36:03,067 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:36:03,067 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:36:03,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:36:03,068 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:36:03,068 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:36:03,068 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:36:03,068 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:36:03,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:36:03,069 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:36:03,069 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:36:03,069 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:36:03,415 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:36:03,437 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:36:03,441 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:36:03,443 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:36:03,444 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:36:03,445 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-08-22 16:36:03,528 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62b8dab17/15c9ea83d77045c8bc7c72e92f8e7475/FLAG88a87d42c [2020-08-22 16:36:04,022 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:36:04,022 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-08-22 16:36:04,029 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62b8dab17/15c9ea83d77045c8bc7c72e92f8e7475/FLAG88a87d42c [2020-08-22 16:36:04,390 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62b8dab17/15c9ea83d77045c8bc7c72e92f8e7475 [2020-08-22 16:36:04,401 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:36:04,403 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:36:04,404 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:36:04,405 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:36:04,408 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:36:04,410 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,413 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49745b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04, skipping insertion in model container [2020-08-22 16:36:04,413 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,423 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:36:04,442 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:36:04,613 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:36:04,618 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:36:04,635 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:36:04,651 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:36:04,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04 WrapperNode [2020-08-22 16:36:04,652 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:36:04,653 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:36:04,653 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:36:04,653 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:36:04,668 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,772 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,773 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,777 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,780 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,781 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (1/1) ... [2020-08-22 16:36:04,785 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:36:04,786 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:36:04,786 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:36:04,787 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:36:04,788 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (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 16:36:04,860 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:36:04,861 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:36:04,861 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-22 16:36:04,861 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:36:04,861 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:36:04,861 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-22 16:36:04,861 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:36:04,861 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:36:04,862 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:36:05,048 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:36:05,049 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 16:36:05,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:36:05 BoogieIcfgContainer [2020-08-22 16:36:05,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:36:05,055 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:36:05,055 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:36:05,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:36:05,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:36:04" (1/3) ... [2020-08-22 16:36:05,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39985d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:36:05, skipping insertion in model container [2020-08-22 16:36:05,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:04" (2/3) ... [2020-08-22 16:36:05,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39985d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:36:05, skipping insertion in model container [2020-08-22 16:36:05,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:36:05" (3/3) ... [2020-08-22 16:36:05,063 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_15x0-2.c [2020-08-22 16:36:05,072 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:36:05,080 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:36:05,097 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:36:05,124 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:36:05,124 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:36:05,124 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:36:05,125 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:36:05,125 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:36:05,125 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:36:05,125 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:36:05,126 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:36:05,146 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-22 16:36:05,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 16:36:05,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:05,156 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:05,156 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:05,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:05,164 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-22 16:36:05,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:05,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228288185] [2020-08-22 16:36:05,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:05,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:05,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:05,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,452 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 16:36:05,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228288185] [2020-08-22 16:36:05,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:36:05,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 16:36:05,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645762104] [2020-08-22 16:36:05,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:36:05,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:05,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:36:05,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:36:05,545 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-22 16:36:05,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:05,645 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-22 16:36:05,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:36:05,648 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 16:36:05,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:05,660 INFO L225 Difference]: With dead ends: 30 [2020-08-22 16:36:05,660 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 16:36:05,663 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 16:36:05,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 16:36:05,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 16:36:05,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 16:36:05,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-22 16:36:05,705 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-22 16:36:05,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:05,705 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-22 16:36:05,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:36:05,706 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-22 16:36:05,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 16:36:05,708 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:05,708 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:05,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:36:05,709 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:05,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:05,709 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-22 16:36:05,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:05,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470070330] [2020-08-22 16:36:05,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:05,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:05,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:05,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:05,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,837 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 16:36:05,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470070330] [2020-08-22 16:36:05,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133960717] [2020-08-22 16:36:05,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:05,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:05,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:36:05,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:06,015 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 16:36:06,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:06,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-08-22 16:36:06,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807394142] [2020-08-22 16:36:06,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:36:06,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:06,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:36:06,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:36:06,020 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-08-22 16:36:06,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:06,104 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-22 16:36:06,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:36:06,105 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-22 16:36:06,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:06,106 INFO L225 Difference]: With dead ends: 25 [2020-08-22 16:36:06,106 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 16:36:06,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:36:06,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 16:36:06,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 16:36:06,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 16:36:06,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-22 16:36:06,115 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-22 16:36:06,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:06,115 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-22 16:36:06,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:36:06,116 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-22 16:36:06,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 16:36:06,117 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:06,117 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:06,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-08-22 16:36:06,319 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:06,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:06,320 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-22 16:36:06,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:06,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114838655] [2020-08-22 16:36:06,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:06,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:06,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:06,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:06,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:06,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:06,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:06,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:06,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:06,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:06,571 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-22 16:36:06,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114838655] [2020-08-22 16:36:06,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923796699] [2020-08-22 16:36:06,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:06,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:36:06,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:06,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2020-08-22 16:36:06,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:06,697 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-22 16:36:06,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:06,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-08-22 16:36:06,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504968896] [2020-08-22 16:36:06,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 16:36:06,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:06,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 16:36:06,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:36:06,701 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 8 states. [2020-08-22 16:36:06,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:06,797 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-22 16:36:06,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 16:36:06,797 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-08-22 16:36:06,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:06,800 INFO L225 Difference]: With dead ends: 28 [2020-08-22 16:36:06,800 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 16:36:06,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:36:06,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 16:36:06,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 16:36:06,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 16:36:06,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-22 16:36:06,815 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-22 16:36:06,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:06,817 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-22 16:36:06,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 16:36:06,817 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-22 16:36:06,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 16:36:06,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:06,819 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:07,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:07,034 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:07,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:07,035 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-08-22 16:36:07,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:07,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331031304] [2020-08-22 16:36:07,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:07,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:07,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:07,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,208 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-22 16:36:07,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331031304] [2020-08-22 16:36:07,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197022413] [2020-08-22 16:36:07,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:07,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-08-22 16:36:07,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:07,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 10 conjunts are in the unsatisfiable core [2020-08-22 16:36:07,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:07,318 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-22 16:36:07,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:07,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-08-22 16:36:07,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042386099] [2020-08-22 16:36:07,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 16:36:07,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:07,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 16:36:07,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:36:07,321 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2020-08-22 16:36:07,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:07,396 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-22 16:36:07,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:36:07,397 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-22 16:36:07,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:07,398 INFO L225 Difference]: With dead ends: 31 [2020-08-22 16:36:07,399 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 16:36:07,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-22 16:36:07,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 16:36:07,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-22 16:36:07,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 16:36:07,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-22 16:36:07,405 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-22 16:36:07,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:07,406 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-22 16:36:07,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 16:36:07,406 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-22 16:36:07,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 16:36:07,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:07,408 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:07,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:07,622 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:07,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:07,623 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-08-22 16:36:07,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:07,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020227932] [2020-08-22 16:36:07,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:07,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:07,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:07,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:07,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:07,854 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-22 16:36:07,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020227932] [2020-08-22 16:36:07,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789038437] [2020-08-22 16:36:07,855 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:07,892 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:36:07,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:07,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2020-08-22 16:36:07,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:07,948 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-22 16:36:07,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:07,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-08-22 16:36:07,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586249505] [2020-08-22 16:36:07,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 16:36:07,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:07,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 16:36:07,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:36:07,951 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 10 states. [2020-08-22 16:36:08,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:08,034 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-22 16:36:08,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 16:36:08,035 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-22 16:36:08,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:08,036 INFO L225 Difference]: With dead ends: 34 [2020-08-22 16:36:08,036 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 16:36:08,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2020-08-22 16:36:08,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 16:36:08,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 16:36:08,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 16:36:08,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-22 16:36:08,044 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-22 16:36:08,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:08,044 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-22 16:36:08,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 16:36:08,045 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-22 16:36:08,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 16:36:08,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:08,046 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:08,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:08,256 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:08,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:08,257 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-08-22 16:36:08,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:08,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075772761] [2020-08-22 16:36:08,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:08,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:08,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:08,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:08,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:08,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:08,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:08,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:08,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,446 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-22 16:36:08,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075772761] [2020-08-22 16:36:08,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683556383] [2020-08-22 16:36:08,447 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:08,509 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-08-22 16:36:08,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:08,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 14 conjunts are in the unsatisfiable core [2020-08-22 16:36:08,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:08,573 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-22 16:36:08,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:08,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-08-22 16:36:08,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288590380] [2020-08-22 16:36:08,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 16:36:08,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:08,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 16:36:08,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:36:08,576 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 11 states. [2020-08-22 16:36:08,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:08,672 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-22 16:36:08,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 16:36:08,672 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2020-08-22 16:36:08,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:08,674 INFO L225 Difference]: With dead ends: 37 [2020-08-22 16:36:08,674 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 16:36:08,674 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=95, Invalid=177, Unknown=0, NotChecked=0, Total=272 [2020-08-22 16:36:08,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 16:36:08,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 16:36:08,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 16:36:08,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-22 16:36:08,681 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-22 16:36:08,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:08,682 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-22 16:36:08,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 16:36:08,682 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-22 16:36:08,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 16:36:08,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:08,684 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:08,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-08-22 16:36:08,897 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:08,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:08,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-08-22 16:36:08,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:08,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052483221] [2020-08-22 16:36:08,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:08,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:08,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:08,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:08,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,151 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-22 16:36:09,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052483221] [2020-08-22 16:36:09,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298261746] [2020-08-22 16:36:09,152 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:09,206 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-08-22 16:36:09,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:09,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2020-08-22 16:36:09,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:09,339 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-22 16:36:09,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:09,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-08-22 16:36:09,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731931495] [2020-08-22 16:36:09,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 16:36:09,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:09,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 16:36:09,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-08-22 16:36:09,344 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 12 states. [2020-08-22 16:36:09,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:09,478 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-22 16:36:09,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 16:36:09,479 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-08-22 16:36:09,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:09,480 INFO L225 Difference]: With dead ends: 40 [2020-08-22 16:36:09,480 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 16:36:09,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-08-22 16:36:09,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 16:36:09,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 16:36:09,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 16:36:09,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-22 16:36:09,494 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-22 16:36:09,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:09,495 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-22 16:36:09,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 16:36:09,498 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-22 16:36:09,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 16:36:09,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:09,499 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:09,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:09,718 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:09,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:09,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-08-22 16:36:09,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:09,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112516642] [2020-08-22 16:36:09,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:09,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:09,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:09,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:09,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:09,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,022 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-22 16:36:10,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112516642] [2020-08-22 16:36:10,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128997893] [2020-08-22 16:36:10,023 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:10,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 18 conjunts are in the unsatisfiable core [2020-08-22 16:36:10,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:10,164 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-22 16:36:10,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:10,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-08-22 16:36:10,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640267238] [2020-08-22 16:36:10,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 16:36:10,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:10,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 16:36:10,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-08-22 16:36:10,167 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 13 states. [2020-08-22 16:36:10,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:10,318 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-22 16:36:10,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 16:36:10,318 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-08-22 16:36:10,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:10,320 INFO L225 Difference]: With dead ends: 43 [2020-08-22 16:36:10,320 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 16:36:10,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2020-08-22 16:36:10,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 16:36:10,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 16:36:10,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 16:36:10,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-22 16:36:10,335 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-22 16:36:10,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:10,338 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-22 16:36:10,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 16:36:10,338 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-22 16:36:10,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-22 16:36:10,340 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:10,340 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:10,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:10,558 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:10,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:10,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-08-22 16:36:10,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:10,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271171351] [2020-08-22 16:36:10,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:10,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:10,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:10,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:10,857 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-22 16:36:10,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271171351] [2020-08-22 16:36:10,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081800312] [2020-08-22 16:36:10,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:10,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:36:10,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:10,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 20 conjunts are in the unsatisfiable core [2020-08-22 16:36:10,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:10,959 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-22 16:36:10,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:10,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-08-22 16:36:10,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023916362] [2020-08-22 16:36:10,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 16:36:10,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:10,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 16:36:10,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:36:10,963 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-22 16:36:11,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:11,119 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-22 16:36:11,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 16:36:11,119 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 61 [2020-08-22 16:36:11,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:11,121 INFO L225 Difference]: With dead ends: 46 [2020-08-22 16:36:11,121 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 16:36:11,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=179, Invalid=327, Unknown=0, NotChecked=0, Total=506 [2020-08-22 16:36:11,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 16:36:11,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 16:36:11,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 16:36:11,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-22 16:36:11,129 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-22 16:36:11,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:11,129 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-22 16:36:11,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 16:36:11,129 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-22 16:36:11,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-22 16:36:11,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:11,131 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:11,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-08-22 16:36:11,344 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:11,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:11,345 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-08-22 16:36:11,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:11,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126101284] [2020-08-22 16:36:11,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:11,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:11,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:11,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:11,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-22 16:36:11,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126101284] [2020-08-22 16:36:11,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647011653] [2020-08-22 16:36:11,664 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:11,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-08-22 16:36:11,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:11,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 22 conjunts are in the unsatisfiable core [2020-08-22 16:36:11,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:11,802 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-22 16:36:11,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:11,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-08-22 16:36:11,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320389141] [2020-08-22 16:36:11,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 16:36:11,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:11,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 16:36:11,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2020-08-22 16:36:11,805 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 15 states. [2020-08-22 16:36:11,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:11,946 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-22 16:36:11,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 16:36:11,946 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 67 [2020-08-22 16:36:11,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:11,948 INFO L225 Difference]: With dead ends: 49 [2020-08-22 16:36:11,948 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 16:36:11,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=213, Invalid=387, Unknown=0, NotChecked=0, Total=600 [2020-08-22 16:36:11,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 16:36:11,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 16:36:11,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 16:36:11,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-22 16:36:11,955 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-22 16:36:11,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:11,956 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-22 16:36:11,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 16:36:11,956 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-22 16:36:11,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-22 16:36:11,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:11,957 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:12,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:12,172 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:12,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:12,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-08-22 16:36:12,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:12,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181284540] [2020-08-22 16:36:12,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:12,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:12,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:12,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:12,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:12,574 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-22 16:36:12,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181284540] [2020-08-22 16:36:12,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567930597] [2020-08-22 16:36:12,575 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:12,619 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:36:12,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:12,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 24 conjunts are in the unsatisfiable core [2020-08-22 16:36:12,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:12,677 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-22 16:36:12,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:12,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-08-22 16:36:12,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278500793] [2020-08-22 16:36:12,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 16:36:12,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:12,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 16:36:12,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-08-22 16:36:12,680 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 16 states. [2020-08-22 16:36:12,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:12,865 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-22 16:36:12,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 16:36:12,865 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 73 [2020-08-22 16:36:12,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:12,867 INFO L225 Difference]: With dead ends: 52 [2020-08-22 16:36:12,867 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 16:36:12,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=250, Invalid=452, Unknown=0, NotChecked=0, Total=702 [2020-08-22 16:36:12,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 16:36:12,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 16:36:12,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 16:36:12,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-22 16:36:12,875 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-22 16:36:12,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:12,875 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-22 16:36:12,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 16:36:12,876 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-22 16:36:12,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-22 16:36:12,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:12,877 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:13,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:13,093 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:13,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:13,094 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2020-08-22 16:36:13,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:13,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518186441] [2020-08-22 16:36:13,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:13,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:13,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:13,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:13,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:13,518 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-22 16:36:13,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518186441] [2020-08-22 16:36:13,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106833134] [2020-08-22 16:36:13,519 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:13,581 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-08-22 16:36:13,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:13,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 26 conjunts are in the unsatisfiable core [2020-08-22 16:36:13,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:13,649 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-22 16:36:13,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:13,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-08-22 16:36:13,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178253454] [2020-08-22 16:36:13,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 16:36:13,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:13,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 16:36:13,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=174, Unknown=0, NotChecked=0, Total=272 [2020-08-22 16:36:13,652 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 17 states. [2020-08-22 16:36:13,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:13,870 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-22 16:36:13,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 16:36:13,870 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 79 [2020-08-22 16:36:13,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:13,871 INFO L225 Difference]: With dead ends: 55 [2020-08-22 16:36:13,872 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 16:36:13,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=290, Invalid=522, Unknown=0, NotChecked=0, Total=812 [2020-08-22 16:36:13,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 16:36:13,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-22 16:36:13,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 16:36:13,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-22 16:36:13,885 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-22 16:36:13,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:13,886 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-22 16:36:13,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 16:36:13,886 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-22 16:36:13,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-22 16:36:13,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:13,888 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:14,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-08-22 16:36:14,089 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:14,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:14,089 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2020-08-22 16:36:14,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:14,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141683267] [2020-08-22 16:36:14,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:14,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:14,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:14,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:14,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:14,680 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-22 16:36:14,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141683267] [2020-08-22 16:36:14,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219223686] [2020-08-22 16:36:14,681 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:14,781 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-08-22 16:36:14,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:14,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 28 conjunts are in the unsatisfiable core [2020-08-22 16:36:14,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:14,900 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-22 16:36:14,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:14,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-08-22 16:36:14,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537973726] [2020-08-22 16:36:14,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 16:36:14,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:14,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 16:36:14,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2020-08-22 16:36:14,906 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 18 states. [2020-08-22 16:36:15,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:15,108 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-22 16:36:15,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 16:36:15,108 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 85 [2020-08-22 16:36:15,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:15,109 INFO L225 Difference]: With dead ends: 58 [2020-08-22 16:36:15,109 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 16:36:15,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=333, Invalid=597, Unknown=0, NotChecked=0, Total=930 [2020-08-22 16:36:15,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 16:36:15,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-22 16:36:15,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 16:36:15,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-22 16:36:15,123 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-22 16:36:15,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:15,124 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-22 16:36:15,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 16:36:15,124 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-22 16:36:15,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-22 16:36:15,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:15,126 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:15,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-08-22 16:36:15,336 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:15,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:15,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2020-08-22 16:36:15,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:15,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795993464] [2020-08-22 16:36:15,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:15,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:15,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:15,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:15,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,865 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-22 16:36:15,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795993464] [2020-08-22 16:36:15,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55002344] [2020-08-22 16:36:15,871 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:15,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:15,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 30 conjunts are in the unsatisfiable core [2020-08-22 16:36:15,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:16,016 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-22 16:36:16,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:16,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-08-22 16:36:16,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050112662] [2020-08-22 16:36:16,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 16:36:16,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:16,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 16:36:16,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=215, Unknown=0, NotChecked=0, Total=342 [2020-08-22 16:36:16,018 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 19 states. [2020-08-22 16:36:16,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:16,259 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-22 16:36:16,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 16:36:16,260 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 91 [2020-08-22 16:36:16,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:16,262 INFO L225 Difference]: With dead ends: 61 [2020-08-22 16:36:16,262 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 16:36:16,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=379, Invalid=677, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 16:36:16,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 16:36:16,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-22 16:36:16,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 16:36:16,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-22 16:36:16,281 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-22 16:36:16,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:16,282 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-22 16:36:16,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 16:36:16,282 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-22 16:36:16,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-22 16:36:16,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:16,286 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:16,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-08-22 16:36:16,501 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:16,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:16,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2020-08-22 16:36:16,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:16,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689321811] [2020-08-22 16:36:16,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:16,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:16,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:16,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:16,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:16,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:17,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:17,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:17,092 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-22 16:36:17,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689321811] [2020-08-22 16:36:17,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752129154] [2020-08-22 16:36:17,093 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:17,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:36:17,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:36:17,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 32 conjunts are in the unsatisfiable core [2020-08-22 16:36:17,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:17,242 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-22 16:36:17,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:17,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-08-22 16:36:17,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606709360] [2020-08-22 16:36:17,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 16:36:17,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:17,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 16:36:17,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=237, Unknown=0, NotChecked=0, Total=380 [2020-08-22 16:36:17,245 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 20 states. [2020-08-22 16:36:17,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:17,467 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-22 16:36:17,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 16:36:17,468 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 97 [2020-08-22 16:36:17,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:17,469 INFO L225 Difference]: With dead ends: 64 [2020-08-22 16:36:17,469 INFO L226 Difference]: Without dead ends: 60 [2020-08-22 16:36:17,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=428, Invalid=762, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 16:36:17,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-22 16:36:17,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-22 16:36:17,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 16:36:17,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-22 16:36:17,476 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-22 16:36:17,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:17,476 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-22 16:36:17,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 16:36:17,477 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-22 16:36:17,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-22 16:36:17,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:17,478 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:17,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:17,692 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:17,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:17,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2020-08-22 16:36:17,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:17,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438444372] [2020-08-22 16:36:17,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:17,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:36:17,713 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:36:17,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:36:17,732 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:36:17,753 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:36:17,753 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:36:17,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 16:36:17,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:36:17 BoogieIcfgContainer [2020-08-22 16:36:17,797 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:36:17,800 INFO L168 Benchmark]: Toolchain (without parser) took 13396.32 ms. Allocated memory was 145.8 MB in the beginning and 364.4 MB in the end (delta: 218.6 MB). Free memory was 102.1 MB in the beginning and 196.3 MB in the end (delta: -94.2 MB). Peak memory consumption was 124.4 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:17,801 INFO L168 Benchmark]: CDTParser took 0.56 ms. Allocated memory is still 145.8 MB. Free memory was 120.4 MB in the beginning and 120.0 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-08-22 16:36:17,802 INFO L168 Benchmark]: CACSL2BoogieTranslator took 248.49 ms. Allocated memory is still 145.8 MB. Free memory was 101.6 MB in the beginning and 92.0 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:17,802 INFO L168 Benchmark]: Boogie Preprocessor took 132.57 ms. Allocated memory was 145.8 MB in the beginning and 202.4 MB in the end (delta: 56.6 MB). Free memory was 92.0 MB in the beginning and 181.2 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:17,803 INFO L168 Benchmark]: RCFGBuilder took 267.33 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 169.8 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:17,804 INFO L168 Benchmark]: TraceAbstraction took 12742.64 ms. Allocated memory was 202.4 MB in the beginning and 364.4 MB in the end (delta: 162.0 MB). Free memory was 169.8 MB in the beginning and 196.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 135.5 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:17,807 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.56 ms. Allocated memory is still 145.8 MB. Free memory was 120.4 MB in the beginning and 120.0 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 248.49 ms. Allocated memory is still 145.8 MB. Free memory was 101.6 MB in the beginning and 92.0 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 132.57 ms. Allocated memory was 145.8 MB in the beginning and 202.4 MB in the end (delta: 56.6 MB). Free memory was 92.0 MB in the beginning and 181.2 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 267.33 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 169.8 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 12742.64 ms. Allocated memory was 202.4 MB in the beginning and 364.4 MB in the end (delta: 162.0 MB). Free memory was 169.8 MB in the beginning and 196.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 135.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 15; [L13] int b = 0; VAL [a=15, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=15] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=15, m=0, n=15] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=14] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=14, m=1, n=14] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=13] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=13, m=2, n=13] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=12] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=12, m=3, n=12] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=11] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=11, m=4, n=11] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=10, m=5, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=9, m=6, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=8, m=7, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=7, m=8, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=6, m=9, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=5, m=10, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=4, m=11, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=3, m=12, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=2, m=13, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=1, m=14, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=15, \old(n)=0, \result=15, m=15, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=1, m=14, n=1, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=2, m=13, n=2, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=3, m=12, n=3, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=4, m=11, n=4, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=5, m=10, n=5, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=6, m=9, n=6, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=7, m=8, n=7, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=8, m=7, n=8, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=9, m=6, n=9, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=10, m=5, n=10, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=11, m=4, n=11, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=12, m=3, n=12, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=13, m=2, n=13, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=14, m=1, n=14, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=15, m=0, n=15, sum(n - 1, m + 1)=15] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=15, b=0, sum(a, b)=15] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=15, b=0, result=15] [L16] __VERIFIER_error() VAL [a=15, b=0, result=15] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 12.6s, OverallIterations: 16, TraceHistogramMax: 16, AutomataDifference: 2.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 183 SDtfs, 488 SDslu, 767 SDs, 0 SdLazy, 558 SolverSat, 115 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1353 GetRequests, 1069 SyntacticMatches, 0 SemanticMatches, 284 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1120 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, 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, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 5.6s InterpolantComputationTime, 1740 NumberOfCodeBlocks, 1740 NumberOfCodeBlocksAsserted, 81 NumberOfCheckSat, 1608 ConstructedInterpolants, 0 QuantifiedInterpolants, 267360 SizeOfPredicates, 133 NumberOfNonLiveVariables, 2408 ConjunctsInSsa, 266 ConjunctsInUnsatCore, 29 InterpolantComputations, 1 PerfectInterpolantSequences, 3150/6300 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...