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/loop-acceleration/underapprox_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:14:22,552 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:14:22,555 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:14:22,572 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:14:22,573 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:14:22,575 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:14:22,577 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:14:22,586 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:14:22,590 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:14:22,591 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:14:22,592 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:14:22,593 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:14:22,593 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:14:22,594 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:14:22,595 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:14:22,596 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:14:22,597 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:14:22,598 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:14:22,599 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:14:22,601 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:14:22,603 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:14:22,604 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:14:22,605 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:14:22,605 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:14:22,608 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:14:22,610 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:14:22,611 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:14:22,612 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:14:22,613 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:14:22,614 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:14:22,614 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:14:22,615 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:14:22,615 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:14:22,615 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:14:22,616 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:14:22,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:14:22,620 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 [2019-10-14 23:14:22,651 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:14:22,652 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:14:22,655 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:14:22,655 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:14:22,656 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:14:22,656 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:14:22,656 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:14:22,656 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:14:22,656 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:14:22,657 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:14:22,657 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:14:22,657 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:14:22,660 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:14:22,660 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:14:22,661 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:14:22,661 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:14:22,661 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:14:22,661 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:14:22,661 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:14:22,662 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:14:22,662 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:14:22,662 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:14:22,664 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:14:22,665 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:14:22,665 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:14:22,665 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:14:22,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:14:22,665 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:14:22,666 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:14:22,949 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:14:22,963 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:14:22,967 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:14:22,970 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:14:22,970 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:14:22,971 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2019-10-14 23:14:23,049 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/565a23d17/30b7b243461346baa7ae359fd7894519/FLAGde3b853a3 [2019-10-14 23:14:23,511 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:14:23,512 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2019-10-14 23:14:23,519 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/565a23d17/30b7b243461346baa7ae359fd7894519/FLAGde3b853a3 [2019-10-14 23:14:23,874 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/565a23d17/30b7b243461346baa7ae359fd7894519 [2019-10-14 23:14:23,882 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:14:23,883 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:14:23,884 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:23,884 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:14:23,888 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:14:23,889 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:23" (1/1) ... [2019-10-14 23:14:23,892 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f2b11d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:23, skipping insertion in model container [2019-10-14 23:14:23,892 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:23" (1/1) ... [2019-10-14 23:14:23,901 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:14:23,918 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:14:24,067 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:24,070 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:14:24,084 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:24,096 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:14:24,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24 WrapperNode [2019-10-14 23:14:24,097 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:24,098 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:14:24,098 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:14:24,098 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:14:24,198 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,198 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,203 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,203 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,206 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,211 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,212 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (1/1) ... [2019-10-14 23:14:24,213 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:14:24,214 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:14:24,214 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:14:24,214 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:14:24,215 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (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 [2019-10-14 23:14:24,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:14:24,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:14:24,268 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:14:24,268 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:14:24,268 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:14:24,268 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:14:24,268 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:14:24,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:14:24,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:14:24,431 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:14:24,432 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-14 23:14:24,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:24 BoogieIcfgContainer [2019-10-14 23:14:24,433 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:14:24,434 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:14:24,434 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:14:24,437 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:14:24,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:14:23" (1/3) ... [2019-10-14 23:14:24,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6874421e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:24, skipping insertion in model container [2019-10-14 23:14:24,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:24" (2/3) ... [2019-10-14 23:14:24,439 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6874421e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:24, skipping insertion in model container [2019-10-14 23:14:24,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:24" (3/3) ... [2019-10-14 23:14:24,440 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-2.c [2019-10-14 23:14:24,448 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:14:24,455 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:14:24,466 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:14:24,489 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:14:24,489 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:14:24,489 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:14:24,490 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:14:24,490 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:14:24,490 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:14:24,490 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:14:24,490 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:14:24,506 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-10-14 23:14:24,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-14 23:14:24,511 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:24,512 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:24,513 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:24,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:24,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-10-14 23:14:24,525 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:24,525 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889936230] [2019-10-14 23:14:24,525 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:24,525 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:24,526 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:24,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:24,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:24,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:24,718 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889936230] [2019-10-14 23:14:24,719 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:24,719 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:14:24,719 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344156081] [2019-10-14 23:14:24,725 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:14:24,725 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:24,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:14:24,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:14:24,754 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-10-14 23:14:24,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:24,849 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2019-10-14 23:14:24,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:14:24,851 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-10-14 23:14:24,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:24,862 INFO L225 Difference]: With dead ends: 29 [2019-10-14 23:14:24,862 INFO L226 Difference]: Without dead ends: 12 [2019-10-14 23:14:24,866 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:14:24,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-10-14 23:14:24,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-10-14 23:14:24,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-10-14 23:14:24,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-10-14 23:14:24,908 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-10-14 23:14:24,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:24,908 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-10-14 23:14:24,909 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:14:24,909 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-10-14 23:14:24,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-14 23:14:24,909 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:24,910 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:24,910 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:24,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:24,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-10-14 23:14:24,911 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:24,912 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51669795] [2019-10-14 23:14:24,912 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:24,912 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:24,921 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:24,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:25,039 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51669795] [2019-10-14 23:14:25,039 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742822119] [2019-10-14 23:14:25,040 INFO L94 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 [2019-10-14 23:14:25,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,080 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:14:25,086 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:25,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:25,131 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:25,132 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-10-14 23:14:25,132 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618251033] [2019-10-14 23:14:25,134 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 23:14:25,134 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:25,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 23:14:25,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:14:25,135 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2019-10-14 23:14:25,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:25,158 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-10-14 23:14:25,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:14:25,159 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-10-14 23:14:25,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:25,160 INFO L225 Difference]: With dead ends: 18 [2019-10-14 23:14:25,160 INFO L226 Difference]: Without dead ends: 13 [2019-10-14 23:14:25,161 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:14:25,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-10-14 23:14:25,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-10-14 23:14:25,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-10-14 23:14:25,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-10-14 23:14:25,166 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-10-14 23:14:25,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:25,167 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-10-14 23:14:25,167 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 23:14:25,167 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-10-14 23:14:25,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-14 23:14:25,168 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:25,168 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:25,373 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:25,382 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:25,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:25,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-10-14 23:14:25,383 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:25,383 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313212562] [2019-10-14 23:14:25,383 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:25,383 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:25,383 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:25,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,521 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:25,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313212562] [2019-10-14 23:14:25,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637702431] [2019-10-14 23:14:25,523 INFO L92 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 [2019-10-14 23:14:25,566 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:25,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:25,568 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:14:25,569 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:25,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:25,593 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:25,593 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-10-14 23:14:25,593 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134576480] [2019-10-14 23:14:25,594 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 23:14:25,594 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:25,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 23:14:25,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:14:25,595 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-10-14 23:14:25,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:25,636 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-10-14 23:14:25,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 23:14:25,637 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2019-10-14 23:14:25,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:25,638 INFO L225 Difference]: With dead ends: 19 [2019-10-14 23:14:25,638 INFO L226 Difference]: Without dead ends: 14 [2019-10-14 23:14:25,639 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:14:25,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-14 23:14:25,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-14 23:14:25,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-14 23:14:25,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-10-14 23:14:25,645 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-10-14 23:14:25,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:25,645 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-10-14 23:14:25,645 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 23:14:25,645 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-10-14 23:14:25,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-14 23:14:25,646 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:25,646 INFO L380 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:25,852 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:25,853 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:25,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:25,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-10-14 23:14:25,854 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:25,854 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355326420] [2019-10-14 23:14:25,854 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:25,854 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:25,854 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:25,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:25,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355326420] [2019-10-14 23:14:25,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850757915] [2019-10-14 23:14:25,988 INFO L92 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 [2019-10-14 23:14:26,031 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 23:14:26,031 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:26,033 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:14:26,035 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:26,071 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:26,073 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:26,073 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-10-14 23:14:26,074 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185871984] [2019-10-14 23:14:26,074 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:14:26,075 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:26,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:14:26,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:26,075 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2019-10-14 23:14:26,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:26,128 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2019-10-14 23:14:26,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:14:26,129 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2019-10-14 23:14:26,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:26,130 INFO L225 Difference]: With dead ends: 20 [2019-10-14 23:14:26,130 INFO L226 Difference]: Without dead ends: 15 [2019-10-14 23:14:26,131 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:26,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-10-14 23:14:26,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-10-14 23:14:26,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-14 23:14:26,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-10-14 23:14:26,135 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-10-14 23:14:26,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:26,136 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-10-14 23:14:26,136 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:14:26,136 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-10-14 23:14:26,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 23:14:26,137 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:26,137 INFO L380 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:26,340 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:26,341 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:26,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:26,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-10-14 23:14:26,343 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:26,343 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379576520] [2019-10-14 23:14:26,344 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:26,344 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:26,344 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:26,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:26,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:26,483 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:26,484 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379576520] [2019-10-14 23:14:26,484 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656799690] [2019-10-14 23:14:26,484 INFO L92 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 [2019-10-14 23:14:26,529 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:26,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:26,530 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:14:26,532 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:26,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:26,563 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:26,563 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-10-14 23:14:26,564 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636410106] [2019-10-14 23:14:26,564 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 23:14:26,565 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:26,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 23:14:26,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:26,565 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2019-10-14 23:14:26,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:26,610 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-10-14 23:14:26,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:14:26,611 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-10-14 23:14:26,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:26,612 INFO L225 Difference]: With dead ends: 21 [2019-10-14 23:14:26,612 INFO L226 Difference]: Without dead ends: 16 [2019-10-14 23:14:26,613 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:26,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-14 23:14:26,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-10-14 23:14:26,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-14 23:14:26,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-10-14 23:14:26,617 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-10-14 23:14:26,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:26,618 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-10-14 23:14:26,618 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 23:14:26,618 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-10-14 23:14:26,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 23:14:26,618 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:26,619 INFO L380 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:26,819 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:26,820 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:26,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:26,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-10-14 23:14:26,821 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:26,822 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156365821] [2019-10-14 23:14:26,822 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:26,822 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:26,822 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:26,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:26,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:26,947 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:26,947 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156365821] [2019-10-14 23:14:26,947 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128166175] [2019-10-14 23:14:26,947 INFO L92 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 [2019-10-14 23:14:26,986 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 23:14:26,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:26,988 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:14:26,990 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:27,020 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:27,022 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:27,022 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-10-14 23:14:27,023 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119642715] [2019-10-14 23:14:27,023 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:14:27,024 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:27,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:14:27,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:27,025 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 9 states. [2019-10-14 23:14:27,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:27,097 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-10-14 23:14:27,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:14:27,098 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-10-14 23:14:27,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:27,099 INFO L225 Difference]: With dead ends: 22 [2019-10-14 23:14:27,099 INFO L226 Difference]: Without dead ends: 17 [2019-10-14 23:14:27,100 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:27,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-14 23:14:27,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-14 23:14:27,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-14 23:14:27,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-10-14 23:14:27,108 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-10-14 23:14:27,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:27,108 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-10-14 23:14:27,108 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:14:27,108 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-10-14 23:14:27,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 23:14:27,109 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:27,109 INFO L380 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:27,312 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:27,313 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:27,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:27,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-10-14 23:14:27,313 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:27,313 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678034293] [2019-10-14 23:14:27,314 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:27,314 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:27,314 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:27,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:29,474 WARN L838 $PredicateComparison]: unable to prove that (<= (* 268435456 (div (+ (* c_main_~y~0 178956971) 357913939) 268435456)) (+ (* 178956971 c_main_~y~0) 89478484)) is different from false [2019-10-14 23:14:35,827 WARN L191 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 12 [2019-10-14 23:14:39,891 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 12 [2019-10-14 23:14:42,259 WARN L191 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 18 [2019-10-14 23:14:50,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:50,358 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 14 refuted. 1 times theorem prover too weak. 0 trivial. 6 not checked. [2019-10-14 23:14:50,358 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678034293] [2019-10-14 23:14:50,358 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379254367] [2019-10-14 23:14:50,359 INFO L92 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 [2019-10-14 23:14:50,395 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 23:14:50,395 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:50,396 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 23:14:50,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:00,991 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:00,992 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:00,996 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:00,997 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:01,000 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms