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/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:13:57,543 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:13:57,545 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:13:57,563 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:13:57,563 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:13:57,565 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:13:57,567 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:13:57,575 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:13:57,579 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:13:57,582 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:13:57,584 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:13:57,586 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:13:57,586 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:13:57,588 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:13:57,590 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:13:57,592 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:13:57,593 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:13:57,593 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:13:57,595 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:13:57,600 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:13:57,604 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:13:57,607 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:13:57,610 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:13:57,610 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:13:57,612 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-14 23:13:57,613 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-14 23:13:57,613 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-14 23:13:57,614 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-14 23:13:57,616 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-14 23:13:57,617 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-14 23:13:57,617 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:13:57,618 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:13:57,618 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:13:57,619 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:13:57,620 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:13:57,620 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:13:57,621 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:13:57,621 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:13:57,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:13:57,622 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:13:57,623 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:13:57,624 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 23:13:57,654 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:13:57,654 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:13:57,656 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:13:57,657 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:13:57,657 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:13:57,657 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:13:57,658 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:13:57,658 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:13:57,658 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:13:57,658 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:13:57,659 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:13:57,659 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:13:57,660 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:13:57,660 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:13:57,660 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:13:57,660 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:13:57,661 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:13:57,661 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:13:57,661 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:13:57,661 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:13:57,661 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:13:57,662 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:13:57,662 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:13:57,662 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:13:57,662 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:13:57,662 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:13:57,663 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:13:57,663 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:13:57,663 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:13:57,950 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:13:57,969 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:13:57,975 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:13:57,976 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:13:57,976 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:13:57,977 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i [2019-10-14 23:13:58,051 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea643a9fb/c21d815fc9974b70a1693238760bd11c/FLAGa83edacfb [2019-10-14 23:13:58,471 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:13:58,472 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i [2019-10-14 23:13:58,478 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea643a9fb/c21d815fc9974b70a1693238760bd11c/FLAGa83edacfb [2019-10-14 23:13:58,872 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea643a9fb/c21d815fc9974b70a1693238760bd11c [2019-10-14 23:13:58,882 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:13:58,884 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:13:58,885 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:13:58,885 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:13:58,888 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:13:58,889 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:13:58" (1/1) ... [2019-10-14 23:13:58,892 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2be43138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:58, skipping insertion in model container [2019-10-14 23:13:58,892 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:13:58" (1/1) ... [2019-10-14 23:13:58,899 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:13:58,915 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:13:59,102 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:13:59,115 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:13:59,148 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:13:59,175 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:13:59,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59 WrapperNode [2019-10-14 23:13:59,176 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:13:59,177 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:13:59,177 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:13:59,177 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:13:59,277 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,278 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,287 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,288 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,307 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (1/1) ... [2019-10-14 23:13:59,317 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:13:59,318 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:13:59,318 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:13:59,318 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:13:59,319 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (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 23:13:59,383 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:13:59,383 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:13:59,384 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:13:59,384 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:13:59,384 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:13:59,384 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:13:59,385 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:13:59,385 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 23:13:59,385 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 23:13:59,385 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 23:13:59,385 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 23:13:59,385 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:13:59,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:13:59,614 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:13:59,614 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-14 23:13:59,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:13:59 BoogieIcfgContainer [2019-10-14 23:13:59,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:13:59,616 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:13:59,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:13:59,619 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:13:59,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:13:58" (1/3) ... [2019-10-14 23:13:59,620 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26aaeaac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:13:59, skipping insertion in model container [2019-10-14 23:13:59,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:13:59" (2/3) ... [2019-10-14 23:13:59,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26aaeaac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:13:59, skipping insertion in model container [2019-10-14 23:13:59,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:13:59" (3/3) ... [2019-10-14 23:13:59,623 INFO L109 eAbstractionObserver]: Analyzing ICFG array_2-1.i [2019-10-14 23:13:59,632 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:13:59,648 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:13:59,671 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:13:59,732 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:13:59,736 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:13:59,736 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:13:59,737 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:13:59,737 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:13:59,737 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:13:59,737 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:13:59,737 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:13:59,766 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-10-14 23:13:59,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-14 23:13:59,773 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:13:59,774 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:13:59,779 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:13:59,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:13:59,784 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2019-10-14 23:13:59,790 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:13:59,790 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92925075] [2019-10-14 23:13:59,791 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:13:59,791 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:13:59,791 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:13:59,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:13:59,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:13:59,936 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 23:13:59,937 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92925075] [2019-10-14 23:13:59,938 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:13:59,938 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:13:59,939 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618664118] [2019-10-14 23:13:59,943 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:13:59,943 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:13:59,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:13:59,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:13:59,963 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-10-14 23:14:00,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:00,034 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-10-14 23:14:00,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:14:00,036 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-14 23:14:00,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:00,044 INFO L225 Difference]: With dead ends: 34 [2019-10-14 23:14:00,044 INFO L226 Difference]: Without dead ends: 14 [2019-10-14 23:14:00,047 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 23:14:00,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-14 23:14:00,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-14 23:14:00,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-14 23:14:00,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-10-14 23:14:00,083 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-10-14 23:14:00,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:00,083 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-10-14 23:14:00,084 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:14:00,084 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-10-14 23:14:00,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-14 23:14:00,085 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:00,085 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:00,086 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:00,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:00,086 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2019-10-14 23:14:00,087 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:00,087 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176387383] [2019-10-14 23:14:00,087 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:00,087 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:00,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:00,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,171 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 23:14:00,171 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176387383] [2019-10-14 23:14:00,172 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:14:00,172 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:14:00,172 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987067337] [2019-10-14 23:14:00,174 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:14:00,174 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:00,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:14:00,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:14:00,176 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2019-10-14 23:14:00,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:00,226 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-10-14 23:14:00,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:14:00,227 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-10-14 23:14:00,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:00,228 INFO L225 Difference]: With dead ends: 22 [2019-10-14 23:14:00,228 INFO L226 Difference]: Without dead ends: 16 [2019-10-14 23:14:00,229 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:14:00,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-14 23:14:00,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-10-14 23:14:00,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-14 23:14:00,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-10-14 23:14:00,235 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2019-10-14 23:14:00,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:00,235 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-10-14 23:14:00,235 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:14:00,235 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-10-14 23:14:00,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 23:14:00,236 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:00,236 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:00,237 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:00,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:00,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2019-10-14 23:14:00,238 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:00,238 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67805283] [2019-10-14 23:14:00,238 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:00,238 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:00,239 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:00,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,348 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 23:14:00,348 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67805283] [2019-10-14 23:14:00,349 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162629136] [2019-10-14 23:14:00,349 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 23:14:00,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,398 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 23:14:00,404 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:00,441 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 23:14:00,441 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:00,442 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 23:14:00,442 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531662225] [2019-10-14 23:14:00,442 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 23:14:00,443 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:00,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 23:14:00,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:14:00,444 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2019-10-14 23:14:00,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:00,511 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-10-14 23:14:00,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 23:14:00,512 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-10-14 23:14:00,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:00,513 INFO L225 Difference]: With dead ends: 24 [2019-10-14 23:14:00,513 INFO L226 Difference]: Without dead ends: 18 [2019-10-14 23:14:00,514 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:14:00,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-14 23:14:00,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2019-10-14 23:14:00,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-14 23:14:00,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-10-14 23:14:00,521 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2019-10-14 23:14:00,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:00,521 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-10-14 23:14:00,522 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 23:14:00,522 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-10-14 23:14:00,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 23:14:00,523 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:00,523 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:00,724 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:00,725 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:00,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:00,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2019-10-14 23:14:00,726 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:00,727 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45219385] [2019-10-14 23:14:00,727 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:00,727 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:00,728 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:00,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:00,824 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:00,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45219385] [2019-10-14 23:14:00,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854168944] [2019-10-14 23:14:00,825 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 23:14:00,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:00,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:00,868 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:14:00,870 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:00,885 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:00,886 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:00,886 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 23:14:00,886 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309553073] [2019-10-14 23:14:00,887 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:14:00,887 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:00,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:14:00,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:00,888 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2019-10-14 23:14:00,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:00,927 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2019-10-14 23:14:00,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:14:00,928 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-10-14 23:14:00,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:00,929 INFO L225 Difference]: With dead ends: 26 [2019-10-14 23:14:00,929 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 23:14:00,930 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:14:00,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 23:14:00,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-10-14 23:14:00,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-14 23:14:00,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-10-14 23:14:00,935 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2019-10-14 23:14:00,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:00,936 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-10-14 23:14:00,936 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:14:00,936 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-10-14 23:14:00,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 23:14:00,937 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:00,937 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:01,140 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:01,141 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:01,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:01,142 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2019-10-14 23:14:01,143 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:01,143 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943317390] [2019-10-14 23:14:01,143 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:01,143 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:01,144 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:01,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:01,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:01,267 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:01,267 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943317390] [2019-10-14 23:14:01,267 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647310685] [2019-10-14 23:14:01,267 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 23:14:01,330 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 23:14:01,331 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:01,331 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:14:01,333 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:01,350 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:01,350 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:01,350 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 23:14:01,351 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837023283] [2019-10-14 23:14:01,351 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 23:14:01,352 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:01,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 23:14:01,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:01,352 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2019-10-14 23:14:01,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:01,402 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-10-14 23:14:01,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:14:01,402 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2019-10-14 23:14:01,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:01,403 INFO L225 Difference]: With dead ends: 28 [2019-10-14 23:14:01,403 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 23:14:01,404 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:14:01,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 23:14:01,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-10-14 23:14:01,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 23:14:01,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-10-14 23:14:01,409 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2019-10-14 23:14:01,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:01,409 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-10-14 23:14:01,410 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 23:14:01,410 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-10-14 23:14:01,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 23:14:01,411 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:01,411 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:01,620 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:01,620 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:01,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:01,621 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2019-10-14 23:14:01,621 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:01,621 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334834932] [2019-10-14 23:14:01,621 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:01,621 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:01,621 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:01,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:01,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:01,712 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:01,712 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334834932] [2019-10-14 23:14:01,712 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871523879] [2019-10-14 23:14:01,713 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 23:14:01,748 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:01,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:01,749 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:14:01,751 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:01,767 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:01,767 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:01,767 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 23:14:01,768 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23925456] [2019-10-14 23:14:01,768 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:14:01,768 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:01,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:14:01,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:01,769 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 9 states. [2019-10-14 23:14:01,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:01,823 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-10-14 23:14:01,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:14:01,823 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2019-10-14 23:14:01,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:01,824 INFO L225 Difference]: With dead ends: 30 [2019-10-14 23:14:01,824 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 23:14:01,825 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:14:01,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 23:14:01,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-10-14 23:14:01,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-14 23:14:01,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2019-10-14 23:14:01,830 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2019-10-14 23:14:01,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:01,830 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2019-10-14 23:14:01,830 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:14:01,830 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2019-10-14 23:14:01,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 23:14:01,831 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:01,831 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:02,034 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:02,035 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:02,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:02,035 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2019-10-14 23:14:02,036 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:02,036 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551296192] [2019-10-14 23:14:02,036 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:02,036 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:02,036 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:02,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:02,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:02,132 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:02,133 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551296192] [2019-10-14 23:14:02,133 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1433301638] [2019-10-14 23:14:02,133 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 23:14:02,189 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 23:14:02,189 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:02,190 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:14:02,192 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:02,213 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:02,213 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:02,214 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 23:14:02,214 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827902560] [2019-10-14 23:14:02,214 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:14:02,214 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:02,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:14:02,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:02,215 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 10 states. [2019-10-14 23:14:02,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:02,280 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2019-10-14 23:14:02,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:14:02,280 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2019-10-14 23:14:02,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:02,281 INFO L225 Difference]: With dead ends: 32 [2019-10-14 23:14:02,281 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 23:14:02,282 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:14:02,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 23:14:02,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-10-14 23:14:02,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 23:14:02,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-10-14 23:14:02,288 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2019-10-14 23:14:02,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:02,288 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-10-14 23:14:02,288 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:14:02,288 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-10-14 23:14:02,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-14 23:14:02,289 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:02,289 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:02,498 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:02,500 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:02,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:02,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2019-10-14 23:14:02,501 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:02,501 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897708695] [2019-10-14 23:14:02,501 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:02,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:02,502 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:02,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:02,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:02,615 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:02,615 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897708695] [2019-10-14 23:14:02,615 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004956269] [2019-10-14 23:14:02,616 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 23:14:02,673 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 23:14:02,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:02,674 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:14:02,676 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:02,697 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:02,698 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:02,698 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 23:14:02,698 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765563623] [2019-10-14 23:14:02,699 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:14:02,699 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:02,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:14:02,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:14:02,704 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 11 states. [2019-10-14 23:14:02,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:02,782 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2019-10-14 23:14:02,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:14:02,782 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2019-10-14 23:14:02,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:02,783 INFO L225 Difference]: With dead ends: 34 [2019-10-14 23:14:02,783 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 23:14:02,784 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:14:02,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 23:14:02,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-10-14 23:14:02,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-14 23:14:02,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2019-10-14 23:14:02,789 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2019-10-14 23:14:02,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:02,790 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2019-10-14 23:14:02,790 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:14:02,790 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2019-10-14 23:14:02,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 23:14:02,791 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:02,791 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:02,995 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:02,995 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:02,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:02,996 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2019-10-14 23:14:02,996 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:02,996 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978635222] [2019-10-14 23:14:02,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:02,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:02,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:03,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,125 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:03,125 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978635222] [2019-10-14 23:14:03,125 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962841991] [2019-10-14 23:14:03,125 INFO L92 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 [2019-10-14 23:14:03,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,167 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:14:03,169 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:03,182 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:03,183 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:03,183 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 23:14:03,183 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000221147] [2019-10-14 23:14:03,184 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 23:14:03,184 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:03,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 23:14:03,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:14:03,184 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 12 states. [2019-10-14 23:14:03,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:03,271 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-10-14 23:14:03,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:14:03,272 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2019-10-14 23:14:03,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:03,272 INFO L225 Difference]: With dead ends: 36 [2019-10-14 23:14:03,272 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 23:14:03,273 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:14:03,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 23:14:03,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-10-14 23:14:03,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-14 23:14:03,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2019-10-14 23:14:03,283 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2019-10-14 23:14:03,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:03,283 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2019-10-14 23:14:03,283 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 23:14:03,283 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2019-10-14 23:14:03,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:14:03,284 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:03,285 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:03,485 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:03,486 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:03,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:03,487 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2019-10-14 23:14:03,487 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:03,487 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017617521] [2019-10-14 23:14:03,488 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,488 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:03,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:03,594 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:03,594 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017617521] [2019-10-14 23:14:03,595 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281249760] [2019-10-14 23:14:03,595 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 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 [2019-10-14 23:14:03,652 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:03,653 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:03,653 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:14:03,656 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:03,674 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:03,674 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:03,675 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 23:14:03,675 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785001216] [2019-10-14 23:14:03,676 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:14:03,676 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:03,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:14:03,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:14:03,677 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 13 states. [2019-10-14 23:14:03,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:03,756 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2019-10-14 23:14:03,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:14:03,757 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2019-10-14 23:14:03,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:03,757 INFO L225 Difference]: With dead ends: 38 [2019-10-14 23:14:03,757 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 23:14:03,758 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:14:03,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 23:14:03,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-10-14 23:14:03,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 23:14:03,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-10-14 23:14:03,763 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2019-10-14 23:14:03,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:03,763 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-10-14 23:14:03,763 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:14:03,763 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-10-14 23:14:03,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-14 23:14:03,764 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:03,764 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:03,968 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:03,969 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:03,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:03,970 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2019-10-14 23:14:03,970 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:03,970 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289970551] [2019-10-14 23:14:03,971 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,971 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:03,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:03,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,086 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:04,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289970551] [2019-10-14 23:14:04,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554041059] [2019-10-14 23:14:04,087 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 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 [2019-10-14 23:14:04,166 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-14 23:14:04,166 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:04,167 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:14:04,169 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:04,181 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:04,182 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:04,182 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 23:14:04,182 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785484477] [2019-10-14 23:14:04,183 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 23:14:04,183 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:04,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 23:14:04,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:14:04,184 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 14 states. [2019-10-14 23:14:04,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:04,274 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2019-10-14 23:14:04,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 23:14:04,274 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-10-14 23:14:04,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:04,275 INFO L225 Difference]: With dead ends: 40 [2019-10-14 23:14:04,275 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 23:14:04,276 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:14:04,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 23:14:04,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-10-14 23:14:04,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 23:14:04,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-10-14 23:14:04,281 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2019-10-14 23:14:04,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:04,281 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-10-14 23:14:04,281 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 23:14:04,281 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-10-14 23:14:04,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 23:14:04,282 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:04,282 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:04,491 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:04,492 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:04,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:04,492 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2019-10-14 23:14:04,492 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:04,492 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757323811] [2019-10-14 23:14:04,493 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:04,493 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:04,493 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:04,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:04,636 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:04,637 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757323811] [2019-10-14 23:14:04,637 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1944417724] [2019-10-14 23:14:04,637 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 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 [2019-10-14 23:14:04,680 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:04,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:04,681 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:14:04,683 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:04,710 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:04,711 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:04,712 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 23:14:04,712 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924822503] [2019-10-14 23:14:04,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 23:14:04,713 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:04,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 23:14:04,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:14:04,716 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 15 states. [2019-10-14 23:14:04,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:04,798 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-10-14 23:14:04,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:14:04,799 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 32 [2019-10-14 23:14:04,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:04,800 INFO L225 Difference]: With dead ends: 42 [2019-10-14 23:14:04,800 INFO L226 Difference]: Without dead ends: 36 [2019-10-14 23:14:04,801 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:14:04,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-14 23:14:04,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2019-10-14 23:14:04,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-14 23:14:04,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2019-10-14 23:14:04,806 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2019-10-14 23:14:04,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:04,806 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2019-10-14 23:14:04,806 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 23:14:04,807 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2019-10-14 23:14:04,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 23:14:04,807 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:04,808 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:05,011 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:05,012 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:05,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:05,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2019-10-14 23:14:05,013 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:05,013 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645475118] [2019-10-14 23:14:05,013 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:05,014 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:05,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:05,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:05,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:05,141 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:05,142 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645475118] [2019-10-14 23:14:05,142 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373914665] [2019-10-14 23:14:05,142 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 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 [2019-10-14 23:14:05,345 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 23:14:05,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:05,347 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:14:05,350 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:05,366 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:05,366 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:05,366 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 23:14:05,367 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634901347] [2019-10-14 23:14:05,367 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 23:14:05,367 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:05,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 23:14:05,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:14:05,368 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 16 states. [2019-10-14 23:14:05,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:05,463 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-10-14 23:14:05,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 23:14:05,463 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 34 [2019-10-14 23:14:05,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:05,464 INFO L225 Difference]: With dead ends: 44 [2019-10-14 23:14:05,464 INFO L226 Difference]: Without dead ends: 38 [2019-10-14 23:14:05,465 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:14:05,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-14 23:14:05,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-10-14 23:14:05,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-14 23:14:05,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-10-14 23:14:05,469 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2019-10-14 23:14:05,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:05,469 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-10-14 23:14:05,469 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 23:14:05,469 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-10-14 23:14:05,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-14 23:14:05,470 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:05,470 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:05,671 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:05,671 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:05,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:05,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2019-10-14 23:14:05,673 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:05,673 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683407275] [2019-10-14 23:14:05,673 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:05,673 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:05,674 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:05,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:05,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:05,832 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:05,833 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683407275] [2019-10-14 23:14:05,833 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428144297] [2019-10-14 23:14:05,833 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 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 [2019-10-14 23:14:06,009 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 23:14:06,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:06,011 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 23:14:06,013 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:06,036 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:06,036 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:06,037 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 23:14:06,038 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667753550] [2019-10-14 23:14:06,038 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 23:14:06,038 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:06,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 23:14:06,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:06,039 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 17 states. [2019-10-14 23:14:06,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:06,116 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2019-10-14 23:14:06,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 23:14:06,116 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-10-14 23:14:06,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:06,117 INFO L225 Difference]: With dead ends: 46 [2019-10-14 23:14:06,117 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 23:14:06,118 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:14:06,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 23:14:06,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2019-10-14 23:14:06,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-14 23:14:06,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2019-10-14 23:14:06,123 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2019-10-14 23:14:06,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:06,124 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2019-10-14 23:14:06,124 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 23:14:06,124 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2019-10-14 23:14:06,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 23:14:06,125 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:06,125 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:06,326 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:06,327 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:06,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:06,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2019-10-14 23:14:06,328 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:06,329 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466932610] [2019-10-14 23:14:06,329 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,329 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:06,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,500 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:06,501 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466932610] [2019-10-14 23:14:06,501 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935696681] [2019-10-14 23:14:06,501 INFO L92 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 [2019-10-14 23:14:06,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:06,553 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 23:14:06,555 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:06,575 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:06,577 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:06,577 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 23:14:06,577 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283697576] [2019-10-14 23:14:06,578 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 23:14:06,578 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:06,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 23:14:06,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 23:14:06,579 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 18 states. [2019-10-14 23:14:06,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:06,644 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-10-14 23:14:06,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 23:14:06,645 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2019-10-14 23:14:06,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:06,646 INFO L225 Difference]: With dead ends: 48 [2019-10-14 23:14:06,646 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 23:14:06,647 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 23:14:06,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 23:14:06,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-10-14 23:14:06,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-14 23:14:06,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2019-10-14 23:14:06,652 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2019-10-14 23:14:06,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:06,652 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2019-10-14 23:14:06,652 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 23:14:06,652 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2019-10-14 23:14:06,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-14 23:14:06,653 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:06,653 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:06,859 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:06,860 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:06,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:06,860 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2019-10-14 23:14:06,861 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:06,861 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937980247] [2019-10-14 23:14:06,861 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,862 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:06,862 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:06,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:07,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:07,065 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:07,066 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937980247] [2019-10-14 23:14:07,066 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491152640] [2019-10-14 23:14:07,066 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 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 [2019-10-14 23:14:07,135 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:07,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:07,136 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 23:14:07,143 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:07,175 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:07,175 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:07,176 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 23:14:07,176 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908906471] [2019-10-14 23:14:07,181 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 23:14:07,182 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:07,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 23:14:07,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:14:07,183 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 19 states. [2019-10-14 23:14:07,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:07,325 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2019-10-14 23:14:07,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 23:14:07,326 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 40 [2019-10-14 23:14:07,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:07,327 INFO L225 Difference]: With dead ends: 50 [2019-10-14 23:14:07,327 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 23:14:07,330 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:14:07,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 23:14:07,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-10-14 23:14:07,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 23:14:07,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-10-14 23:14:07,340 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2019-10-14 23:14:07,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:07,342 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-10-14 23:14:07,342 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 23:14:07,343 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-10-14 23:14:07,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 23:14:07,346 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:07,346 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:07,550 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:07,550 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:07,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:07,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2019-10-14 23:14:07,551 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:07,551 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480490731] [2019-10-14 23:14:07,551 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:07,551 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:07,552 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:07,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:07,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:07,763 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:07,764 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480490731] [2019-10-14 23:14:07,764 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261064303] [2019-10-14 23:14:07,764 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,028 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-14 23:14:08,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:08,029 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 23:14:08,030 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:08,058 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:08,059 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:08,059 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 23:14:08,059 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405308689] [2019-10-14 23:14:08,061 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 23:14:08,061 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:08,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 23:14:08,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:14:08,062 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 20 states. [2019-10-14 23:14:08,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:08,142 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-10-14 23:14:08,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 23:14:08,142 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-10-14 23:14:08,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:08,143 INFO L225 Difference]: With dead ends: 52 [2019-10-14 23:14:08,143 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 23:14:08,144 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:14:08,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 23:14:08,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-10-14 23:14:08,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-14 23:14:08,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2019-10-14 23:14:08,148 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2019-10-14 23:14:08,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:08,148 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2019-10-14 23:14:08,149 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 23:14:08,149 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2019-10-14 23:14:08,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 23:14:08,149 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:08,150 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:08,350 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,350 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:08,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:08,351 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2019-10-14 23:14:08,351 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:08,351 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536015814] [2019-10-14 23:14:08,352 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:08,352 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:08,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:08,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:08,555 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:08,556 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536015814] [2019-10-14 23:14:08,556 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220736205] [2019-10-14 23:14:08,556 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,620 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:08,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:08,621 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 23:14:08,623 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:08,642 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:08,642 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:08,642 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 23:14:08,642 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968502331] [2019-10-14 23:14:08,643 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 23:14:08,643 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:08,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 23:14:08,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:14:08,644 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 21 states. [2019-10-14 23:14:08,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:08,746 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-10-14 23:14:08,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 23:14:08,746 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 44 [2019-10-14 23:14:08,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:08,748 INFO L225 Difference]: With dead ends: 54 [2019-10-14 23:14:08,748 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 23:14:08,749 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:14:08,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 23:14:08,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-10-14 23:14:08,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-14 23:14:08,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2019-10-14 23:14:08,758 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2019-10-14 23:14:08,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:08,759 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2019-10-14 23:14:08,759 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 23:14:08,759 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2019-10-14 23:14:08,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 23:14:08,763 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:08,763 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:08,963 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:08,964 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:08,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:08,964 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2019-10-14 23:14:08,964 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:08,964 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742926669] [2019-10-14 23:14:08,964 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:08,964 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:08,964 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:08,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:09,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:09,176 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:09,176 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742926669] [2019-10-14 23:14:09,176 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620397414] [2019-10-14 23:14:09,176 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:09,410 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-14 23:14:09,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:09,412 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 23:14:09,414 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:09,433 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:09,433 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:09,434 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 23:14:09,434 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298940867] [2019-10-14 23:14:09,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 23:14:09,434 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:09,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 23:14:09,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 23:14:09,435 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 22 states. [2019-10-14 23:14:09,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:09,547 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2019-10-14 23:14:09,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 23:14:09,548 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 46 [2019-10-14 23:14:09,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:09,548 INFO L225 Difference]: With dead ends: 56 [2019-10-14 23:14:09,548 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 23:14:09,549 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 23:14:09,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 23:14:09,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-10-14 23:14:09,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 23:14:09,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-10-14 23:14:09,553 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2019-10-14 23:14:09,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:09,553 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-10-14 23:14:09,553 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 23:14:09,554 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-10-14 23:14:09,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 23:14:09,554 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:09,554 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:09,758 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:09,759 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:09,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:09,759 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2019-10-14 23:14:09,759 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:09,759 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024478655] [2019-10-14 23:14:09,759 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:09,759 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:09,760 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:09,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:09,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:09,987 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:09,987 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024478655] [2019-10-14 23:14:09,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670765166] [2019-10-14 23:14:09,988 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:10,771 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-14 23:14:10,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:10,774 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 23:14:10,775 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:10,792 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:10,793 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:10,793 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-14 23:14:10,793 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462871617] [2019-10-14 23:14:10,793 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:14:10,794 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:10,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:14:10,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:14:10,794 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 23 states. [2019-10-14 23:14:10,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:10,925 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2019-10-14 23:14:10,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 23:14:10,926 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-10-14 23:14:10,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:10,927 INFO L225 Difference]: With dead ends: 58 [2019-10-14 23:14:10,927 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 23:14:10,927 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:14:10,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 23:14:10,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2019-10-14 23:14:10,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-14 23:14:10,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2019-10-14 23:14:10,931 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2019-10-14 23:14:10,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:10,932 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2019-10-14 23:14:10,932 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:14:10,932 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2019-10-14 23:14:10,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 23:14:10,932 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:10,933 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:11,137 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:11,138 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:11,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:11,138 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2019-10-14 23:14:11,139 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:11,139 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64867563] [2019-10-14 23:14:11,139 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:11,139 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:11,140 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:11,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:11,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:11,373 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:11,373 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64867563] [2019-10-14 23:14:11,374 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145132923] [2019-10-14 23:14:11,374 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:11,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:11,425 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:14:11,426 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:11,439 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:11,439 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:11,440 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-14 23:14:11,440 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482174121] [2019-10-14 23:14:11,440 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 23:14:11,440 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:11,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 23:14:11,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:14:11,441 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 24 states. [2019-10-14 23:14:11,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:11,542 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-10-14 23:14:11,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 23:14:11,542 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 50 [2019-10-14 23:14:11,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:11,543 INFO L225 Difference]: With dead ends: 60 [2019-10-14 23:14:11,543 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 23:14:11,544 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:14:11,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 23:14:11,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-10-14 23:14:11,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-14 23:14:11,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2019-10-14 23:14:11,548 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2019-10-14 23:14:11,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:11,548 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2019-10-14 23:14:11,548 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 23:14:11,549 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2019-10-14 23:14:11,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-14 23:14:11,549 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:11,549 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:11,753 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:11,753 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:11,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:11,754 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2019-10-14 23:14:11,754 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:11,754 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710259446] [2019-10-14 23:14:11,754 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:11,754 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:11,754 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:11,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,121 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:12,121 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710259446] [2019-10-14 23:14:12,121 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744401189] [2019-10-14 23:14:12,122 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:12,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:12,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:12,213 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 23:14:12,214 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:12,233 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:12,233 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:12,233 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-14 23:14:12,233 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222092886] [2019-10-14 23:14:12,234 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 23:14:12,234 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:12,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 23:14:12,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 23:14:12,235 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 25 states. [2019-10-14 23:14:12,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:12,394 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2019-10-14 23:14:12,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 23:14:12,397 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 52 [2019-10-14 23:14:12,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:12,398 INFO L225 Difference]: With dead ends: 62 [2019-10-14 23:14:12,398 INFO L226 Difference]: Without dead ends: 56 [2019-10-14 23:14:12,399 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 23:14:12,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-14 23:14:12,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-10-14 23:14:12,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 23:14:12,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-10-14 23:14:12,403 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2019-10-14 23:14:12,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:12,403 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-10-14 23:14:12,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 23:14:12,403 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-10-14 23:14:12,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-14 23:14:12,404 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:12,404 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:12,606 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:12,607 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:12,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:12,608 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2019-10-14 23:14:12,608 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:12,608 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261765094] [2019-10-14 23:14:12,609 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:12,609 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:12,609 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:12,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:12,880 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:12,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261765094] [2019-10-14 23:14:12,881 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411475752] [2019-10-14 23:14:12,881 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:14,309 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-10-14 23:14:14,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:14,312 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 23:14:14,313 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:14,332 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:14,332 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-10-14 23:14:14,332 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455818582] [2019-10-14 23:14:14,333 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 23:14:14,334 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:14,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 23:14:14,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 23:14:14,335 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 26 states. [2019-10-14 23:14:14,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:14,412 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2019-10-14 23:14:14,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 23:14:14,413 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 54 [2019-10-14 23:14:14,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:14,413 INFO L225 Difference]: With dead ends: 64 [2019-10-14 23:14:14,414 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 23:14:14,414 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 23:14:14,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 23:14:14,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2019-10-14 23:14:14,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-14 23:14:14,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2019-10-14 23:14:14,420 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2019-10-14 23:14:14,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:14,421 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2019-10-14 23:14:14,421 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 23:14:14,421 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2019-10-14 23:14:14,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-14 23:14:14,422 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:14,422 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:14,628 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:14,629 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:14,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:14,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2019-10-14 23:14:14,629 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:14,630 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196577082] [2019-10-14 23:14:14,630 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:14,630 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:14,630 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:14,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:14,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:14,966 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:14,968 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196577082] [2019-10-14 23:14:14,969 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125719103] [2019-10-14 23:14:14,969 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:15,038 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:15,038 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:15,040 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 23:14:15,053 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:15,075 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:15,076 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:15,076 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-14 23:14:15,076 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848705220] [2019-10-14 23:14:15,077 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 23:14:15,078 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:15,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 23:14:15,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:14:15,078 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 27 states. [2019-10-14 23:14:15,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:15,203 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-10-14 23:14:15,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 23:14:15,207 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 56 [2019-10-14 23:14:15,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:15,208 INFO L225 Difference]: With dead ends: 66 [2019-10-14 23:14:15,208 INFO L226 Difference]: Without dead ends: 60 [2019-10-14 23:14:15,208 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:14:15,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-14 23:14:15,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-10-14 23:14:15,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-14 23:14:15,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2019-10-14 23:14:15,212 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2019-10-14 23:14:15,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:15,212 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2019-10-14 23:14:15,212 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 23:14:15,212 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2019-10-14 23:14:15,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-14 23:14:15,213 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:15,213 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:15,416 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:15,417 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:15,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:15,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2019-10-14 23:14:15,417 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:15,417 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416537263] [2019-10-14 23:14:15,417 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,417 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:15,418 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:15,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:15,775 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:15,775 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416537263] [2019-10-14 23:14:15,775 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880070173] [2019-10-14 23:14:15,775 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:16,036 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-10-14 23:14:16,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:16,038 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 23:14:16,039 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:16,061 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:16,061 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:16,061 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-10-14 23:14:16,061 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434440951] [2019-10-14 23:14:16,062 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 23:14:16,062 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:16,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 23:14:16,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 23:14:16,063 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 28 states. [2019-10-14 23:14:16,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:16,193 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-10-14 23:14:16,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 23:14:16,193 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 58 [2019-10-14 23:14:16,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:16,194 INFO L225 Difference]: With dead ends: 68 [2019-10-14 23:14:16,194 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 23:14:16,194 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 23:14:16,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 23:14:16,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-10-14 23:14:16,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 23:14:16,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-10-14 23:14:16,198 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2019-10-14 23:14:16,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:16,198 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-10-14 23:14:16,198 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 23:14:16,198 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-10-14 23:14:16,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-10-14 23:14:16,199 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:16,199 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:16,403 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:16,404 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:16,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:16,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2019-10-14 23:14:16,405 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:16,405 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933462315] [2019-10-14 23:14:16,405 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:16,405 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:16,406 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:16,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:16,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:16,733 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:16,733 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933462315] [2019-10-14 23:14:16,734 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207420213] [2019-10-14 23:14:16,734 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:20,087 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-10-14 23:14:20,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:20,092 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 23:14:20,094 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:20,107 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:20,107 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:20,107 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-10-14 23:14:20,108 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417207762] [2019-10-14 23:14:20,108 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 23:14:20,108 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:20,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 23:14:20,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:14:20,109 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 29 states. [2019-10-14 23:14:20,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:20,233 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2019-10-14 23:14:20,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-14 23:14:20,233 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 60 [2019-10-14 23:14:20,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:20,234 INFO L225 Difference]: With dead ends: 70 [2019-10-14 23:14:20,234 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 23:14:20,235 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:14:20,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 23:14:20,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-10-14 23:14:20,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-10-14 23:14:20,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2019-10-14 23:14:20,237 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2019-10-14 23:14:20,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:20,238 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2019-10-14 23:14:20,238 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 23:14:20,238 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2019-10-14 23:14:20,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 23:14:20,239 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:20,239 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:20,445 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:20,445 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:20,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:20,446 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2019-10-14 23:14:20,446 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:20,446 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787103118] [2019-10-14 23:14:20,447 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:20,447 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:20,447 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:20,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:20,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:20,792 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:20,792 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787103118] [2019-10-14 23:14:20,793 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433598178] [2019-10-14 23:14:20,793 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:20,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:20,861 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 23:14:20,863 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:20,883 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:20,883 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:20,883 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-10-14 23:14:20,884 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756237128] [2019-10-14 23:14:20,884 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 23:14:20,884 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:20,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 23:14:20,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 23:14:20,885 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 30 states. [2019-10-14 23:14:21,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:21,054 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-10-14 23:14:21,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 23:14:21,055 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 62 [2019-10-14 23:14:21,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:21,056 INFO L225 Difference]: With dead ends: 72 [2019-10-14 23:14:21,056 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 23:14:21,057 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 23:14:21,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 23:14:21,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-10-14 23:14:21,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-10-14 23:14:21,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2019-10-14 23:14:21,059 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2019-10-14 23:14:21,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:21,060 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2019-10-14 23:14:21,060 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 23:14:21,060 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2019-10-14 23:14:21,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-10-14 23:14:21,060 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:21,060 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:21,261 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:21,261 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:21,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:21,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2019-10-14 23:14:21,262 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:21,263 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040894172] [2019-10-14 23:14:21,263 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:21,263 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:21,263 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:21,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:21,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:21,613 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:21,614 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040894172] [2019-10-14 23:14:21,614 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490963831] [2019-10-14 23:14:21,614 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:21,688 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:21,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:21,689 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 23:14:21,691 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:21,711 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:21,711 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-10-14 23:14:21,711 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605723609] [2019-10-14 23:14:21,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 23:14:21,712 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:21,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 23:14:21,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:14:21,713 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 31 states. [2019-10-14 23:14:21,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:21,881 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2019-10-14 23:14:21,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 23:14:21,881 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 64 [2019-10-14 23:14:21,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:21,882 INFO L225 Difference]: With dead ends: 74 [2019-10-14 23:14:21,882 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 23:14:21,883 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:14:21,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 23:14:21,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-10-14 23:14:21,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 23:14:21,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-10-14 23:14:21,887 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2019-10-14 23:14:21,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:21,887 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-10-14 23:14:21,887 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 23:14:21,888 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-10-14 23:14:21,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-10-14 23:14:21,888 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:21,888 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:22,089 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:22,089 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:22,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:22,090 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2019-10-14 23:14:22,090 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:22,091 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097241547] [2019-10-14 23:14:22,091 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:22,091 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:22,091 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:22,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:22,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:22,474 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:22,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097241547] [2019-10-14 23:14:22,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472859373] [2019-10-14 23:14:22,475 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:27,065 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-10-14 23:14:27,066 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:27,070 INFO L256 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-14 23:14:27,072 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:27,087 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:27,088 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:27,088 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2019-10-14 23:14:27,088 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677638644] [2019-10-14 23:14:27,088 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-14 23:14:27,089 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:27,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-14 23:14:27,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-10-14 23:14:27,089 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 32 states. [2019-10-14 23:14:27,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:27,220 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-10-14 23:14:27,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-14 23:14:27,221 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 66 [2019-10-14 23:14:27,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:27,222 INFO L225 Difference]: With dead ends: 76 [2019-10-14 23:14:27,222 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 23:14:27,222 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-10-14 23:14:27,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 23:14:27,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-10-14 23:14:27,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-10-14 23:14:27,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2019-10-14 23:14:27,227 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2019-10-14 23:14:27,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:27,227 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2019-10-14 23:14:27,228 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-14 23:14:27,228 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2019-10-14 23:14:27,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 23:14:27,228 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:27,228 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:27,436 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:27,436 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:27,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:27,436 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2019-10-14 23:14:27,436 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:27,437 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038103988] [2019-10-14 23:14:27,437 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:27,437 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:27,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:27,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:28,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:28,022 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:28,022 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038103988] [2019-10-14 23:14:28,022 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296069654] [2019-10-14 23:14:28,022 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:28,113 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:14:28,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:28,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 23:14:28,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:28,134 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:28,134 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:28,134 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-10-14 23:14:28,134 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644927302] [2019-10-14 23:14:28,136 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 23:14:28,137 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:28,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 23:14:28,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 23:14:28,138 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 33 states. [2019-10-14 23:14:28,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:28,270 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-10-14 23:14:28,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 23:14:28,270 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 68 [2019-10-14 23:14:28,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:28,271 INFO L225 Difference]: With dead ends: 78 [2019-10-14 23:14:28,272 INFO L226 Difference]: Without dead ends: 72 [2019-10-14 23:14:28,273 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 23:14:28,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-10-14 23:14:28,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2019-10-14 23:14:28,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-10-14 23:14:28,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2019-10-14 23:14:28,276 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2019-10-14 23:14:28,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:28,276 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2019-10-14 23:14:28,277 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 23:14:28,277 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2019-10-14 23:14:28,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-10-14 23:14:28,277 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:28,277 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:28,481 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:28,481 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:28,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:28,482 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2019-10-14 23:14:28,482 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:28,483 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398374283] [2019-10-14 23:14:28,483 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:28,483 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:28,483 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:28,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:28,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:28,888 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:28,889 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398374283] [2019-10-14 23:14:28,889 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194996204] [2019-10-14 23:14:28,889 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:29,350 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-10-14 23:14:29,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:29,352 INFO L256 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-14 23:14:29,353 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:29,368 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:29,368 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:29,368 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-10-14 23:14:29,368 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65614463] [2019-10-14 23:14:29,369 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 23:14:29,369 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:29,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 23:14:29,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 23:14:29,369 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 34 states. [2019-10-14 23:14:29,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:29,549 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2019-10-14 23:14:29,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-14 23:14:29,550 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 70 [2019-10-14 23:14:29,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:29,551 INFO L225 Difference]: With dead ends: 80 [2019-10-14 23:14:29,551 INFO L226 Difference]: Without dead ends: 74 [2019-10-14 23:14:29,552 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 23:14:29,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-14 23:14:29,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-10-14 23:14:29,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 23:14:29,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-10-14 23:14:29,556 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2019-10-14 23:14:29,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:29,556 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-10-14 23:14:29,556 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 23:14:29,556 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-10-14 23:14:29,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-14 23:14:29,557 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:29,557 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:29,767 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:29,768 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:29,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:29,769 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2019-10-14 23:14:29,769 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:29,769 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689637891] [2019-10-14 23:14:29,769 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:29,770 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:29,770 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:29,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:30,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:30,224 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:30,225 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689637891] [2019-10-14 23:14:30,225 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770203159] [2019-10-14 23:14:30,225 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:37,730 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-10-14 23:14:37,731 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:37,738 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-14 23:14:37,740 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:37,758 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:37,758 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:37,759 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-10-14 23:14:37,759 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197413730] [2019-10-14 23:14:37,759 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 23:14:37,759 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:37,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 23:14:37,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 23:14:37,760 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 35 states. [2019-10-14 23:14:37,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:37,947 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2019-10-14 23:14:37,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 23:14:37,947 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 72 [2019-10-14 23:14:37,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:37,948 INFO L225 Difference]: With dead ends: 82 [2019-10-14 23:14:37,949 INFO L226 Difference]: Without dead ends: 76 [2019-10-14 23:14:37,951 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 23:14:37,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-14 23:14:37,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-10-14 23:14:37,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-10-14 23:14:37,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2019-10-14 23:14:37,956 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2019-10-14 23:14:37,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:37,957 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2019-10-14 23:14:37,957 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 23:14:37,957 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2019-10-14 23:14:37,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-10-14 23:14:37,958 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:37,958 INFO L380 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:38,158 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:38,159 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:38,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:38,159 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2019-10-14 23:14:38,159 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:38,160 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519119647] [2019-10-14 23:14:38,160 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:38,160 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:38,160 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:38,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:38,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:38,918 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:38,918 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519119647] [2019-10-14 23:14:38,919 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115147649] [2019-10-14 23:14:38,919 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:39,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:39,023 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-14 23:14:39,025 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:39,047 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:39,048 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:39,048 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-10-14 23:14:39,048 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016392962] [2019-10-14 23:14:39,049 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 23:14:39,049 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:39,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 23:14:39,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 23:14:39,050 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 36 states. [2019-10-14 23:14:39,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:39,219 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-10-14 23:14:39,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-14 23:14:39,219 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 74 [2019-10-14 23:14:39,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:39,220 INFO L225 Difference]: With dead ends: 84 [2019-10-14 23:14:39,220 INFO L226 Difference]: Without dead ends: 78 [2019-10-14 23:14:39,221 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 23:14:39,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-14 23:14:39,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2019-10-14 23:14:39,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-14 23:14:39,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2019-10-14 23:14:39,225 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2019-10-14 23:14:39,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:39,225 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2019-10-14 23:14:39,225 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 23:14:39,226 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2019-10-14 23:14:39,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-10-14 23:14:39,226 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:39,226 INFO L380 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:39,428 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:39,429 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:39,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:39,429 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2019-10-14 23:14:39,429 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:39,430 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739699036] [2019-10-14 23:14:39,430 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:39,430 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:39,430 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:39,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:39,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:39,897 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:39,897 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739699036] [2019-10-14 23:14:39,897 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422179101] [2019-10-14 23:14:39,897 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:39,981 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:14:39,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:14:39,982 INFO L256 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-14 23:14:39,983 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:14:40,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:40,007 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:14:40,007 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-10-14 23:14:40,007 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14198160] [2019-10-14 23:14:40,008 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-14 23:14:40,008 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:14:40,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-14 23:14:40,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 23:14:40,009 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 37 states. [2019-10-14 23:14:40,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:14:40,161 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2019-10-14 23:14:40,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-14 23:14:40,162 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 76 [2019-10-14 23:14:40,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:14:40,163 INFO L225 Difference]: With dead ends: 86 [2019-10-14 23:14:40,163 INFO L226 Difference]: Without dead ends: 80 [2019-10-14 23:14:40,164 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 23:14:40,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-10-14 23:14:40,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-10-14 23:14:40,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-10-14 23:14:40,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-10-14 23:14:40,167 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2019-10-14 23:14:40,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:14:40,168 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-10-14 23:14:40,168 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-14 23:14:40,168 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-10-14 23:14:40,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-10-14 23:14:40,168 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:40,169 INFO L380 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:40,371 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:14:40,372 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:40,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:40,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2019-10-14 23:14:40,373 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:40,373 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964927477] [2019-10-14 23:14:40,373 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:40,374 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:40,374 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:14:40,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:40,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:14:40,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:14:40,865 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964927477] [2019-10-14 23:14:40,865 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691037869] [2019-10-14 23:14:40,865 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true