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/array-examples/data_structures_set_multi_proc_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:42:00,139 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:42:00,142 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:42:00,160 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:42:00,160 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:42:00,162 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:42:00,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:42:00,173 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:42:00,177 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:42:00,180 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:42:00,182 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:42:00,183 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:42:00,184 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:42:00,185 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:42:00,187 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:42:00,188 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:42:00,190 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:42:00,191 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:42:00,192 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:42:00,196 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:42:00,201 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:42:00,204 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:42:00,207 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:42:00,208 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:42:00,211 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:42:00,215 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:42:00,216 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:42:00,217 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:42:00,217 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:42:00,219 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:42:00,219 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:42:00,220 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:42:00,220 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:42:00,220 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:42:00,221 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:42:00,222 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:42:00,223 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 21:42:00,250 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:42:00,250 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:42:00,252 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:42:00,253 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:42:00,253 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:42:00,253 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:42:00,253 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:42:00,254 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:42:00,254 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:42:00,254 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:42:00,255 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:42:00,255 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:42:00,255 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:42:00,256 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:42:00,256 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:42:00,256 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:42:00,256 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:42:00,257 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:42:00,257 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:42:00,257 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:42:00,257 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:42:00,257 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:42:00,258 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:42:00,258 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:42:00,258 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:42:00,258 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:42:00,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:42:00,258 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:42:00,259 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:42:00,523 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:42:00,540 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:42:00,544 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:42:00,549 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:42:00,549 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:42:00,552 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_ground-2.i [2019-10-14 21:42:00,627 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d85409fc5/59f18244556747d29ded04efa50ea65f/FLAGd8d8e13cd [2019-10-14 21:42:01,069 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:42:01,070 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_ground-2.i [2019-10-14 21:42:01,079 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d85409fc5/59f18244556747d29ded04efa50ea65f/FLAGd8d8e13cd [2019-10-14 21:42:01,419 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d85409fc5/59f18244556747d29ded04efa50ea65f [2019-10-14 21:42:01,430 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:42:01,431 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:42:01,432 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:01,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:42:01,436 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:42:01,437 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,440 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8424054 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01, skipping insertion in model container [2019-10-14 21:42:01,440 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,448 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:42:01,469 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:42:01,652 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:01,661 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:42:01,684 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:01,789 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:42:01,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01 WrapperNode [2019-10-14 21:42:01,790 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:01,791 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:42:01,791 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:42:01,791 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:42:01,804 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,804 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,821 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,821 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,834 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,841 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (1/1) ... [2019-10-14 21:42:01,846 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:42:01,847 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:42:01,847 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:42:01,847 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:42:01,848 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (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 21:42:01,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:42:01,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:42:01,897 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:42:01,897 INFO L138 BoogieDeclarations]: Found implementation of procedure insert [2019-10-14 21:42:01,898 INFO L138 BoogieDeclarations]: Found implementation of procedure elem_exists [2019-10-14 21:42:01,898 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:42:01,898 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:42:01,898 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:42:01,898 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:42:01,898 INFO L130 BoogieDeclarations]: Found specification of procedure insert [2019-10-14 21:42:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:42:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure elem_exists [2019-10-14 21:42:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:42:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:42:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:42:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:42:01,900 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:42:01,900 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:42:02,265 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:42:02,266 INFO L284 CfgBuilder]: Removed 8 assume(true) statements. [2019-10-14 21:42:02,267 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:02 BoogieIcfgContainer [2019-10-14 21:42:02,267 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:42:02,268 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:42:02,269 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:42:02,272 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:42:02,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:42:01" (1/3) ... [2019-10-14 21:42:02,273 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e126c8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:02, skipping insertion in model container [2019-10-14 21:42:02,273 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:01" (2/3) ... [2019-10-14 21:42:02,273 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e126c8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:02, skipping insertion in model container [2019-10-14 21:42:02,274 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:02" (3/3) ... [2019-10-14 21:42:02,277 INFO L109 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_ground-2.i [2019-10-14 21:42:02,285 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:42:02,292 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:42:02,303 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:42:02,329 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:42:02,329 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:42:02,329 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:42:02,329 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:42:02,330 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:42:02,330 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:42:02,330 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:42:02,330 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:42:02,347 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states. [2019-10-14 21:42:02,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:42:02,353 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:02,354 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:02,356 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:02,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:02,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1780536170, now seen corresponding path program 1 times [2019-10-14 21:42:02,370 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:02,370 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991615731] [2019-10-14 21:42:02,371 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:02,371 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:02,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:02,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:02,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:02,579 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 21:42:02,580 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991615731] [2019-10-14 21:42:02,581 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:02,581 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:02,582 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362491157] [2019-10-14 21:42:02,587 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:02,588 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:02,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:02,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:02,609 INFO L87 Difference]: Start difference. First operand 54 states. Second operand 4 states. [2019-10-14 21:42:02,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:02,948 INFO L93 Difference]: Finished difference Result 129 states and 190 transitions. [2019-10-14 21:42:02,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:02,950 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-10-14 21:42:02,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:02,961 INFO L225 Difference]: With dead ends: 129 [2019-10-14 21:42:02,962 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:42:02,966 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 21:42:02,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:42:03,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 50. [2019-10-14 21:42:03,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-14 21:42:03,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2019-10-14 21:42:03,017 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 14 [2019-10-14 21:42:03,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:03,017 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2019-10-14 21:42:03,018 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:03,018 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2019-10-14 21:42:03,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:42:03,020 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:03,020 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:03,020 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:03,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:03,021 INFO L82 PathProgramCache]: Analyzing trace with hash 2111973388, now seen corresponding path program 1 times [2019-10-14 21:42:03,021 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:03,022 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816745491] [2019-10-14 21:42:03,022 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:03,022 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:03,022 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:03,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:03,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:03,117 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 21:42:03,118 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816745491] [2019-10-14 21:42:03,118 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608887544] [2019-10-14 21:42:03,118 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 21:42:03,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:03,184 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:03,190 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:03,227 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 21:42:03,227 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:03,227 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:42:03,228 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618760750] [2019-10-14 21:42:03,233 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:42:03,233 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:03,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:42:03,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:03,234 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand 6 states. [2019-10-14 21:42:03,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:03,491 INFO L93 Difference]: Finished difference Result 142 states and 182 transitions. [2019-10-14 21:42:03,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:42:03,492 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-10-14 21:42:03,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:03,494 INFO L225 Difference]: With dead ends: 142 [2019-10-14 21:42:03,494 INFO L226 Difference]: Without dead ends: 101 [2019-10-14 21:42:03,495 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 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 21:42:03,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-10-14 21:42:03,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 52. [2019-10-14 21:42:03,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:42:03,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2019-10-14 21:42:03,510 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 16 [2019-10-14 21:42:03,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:03,510 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2019-10-14 21:42:03,510 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:42:03,511 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2019-10-14 21:42:03,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 21:42:03,513 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:03,514 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:03,719 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:03,720 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:03,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:03,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1499407314, now seen corresponding path program 2 times [2019-10-14 21:42:03,722 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:03,722 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713114964] [2019-10-14 21:42:03,723 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:03,723 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:03,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:03,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:03,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:03,837 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 21:42:03,837 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713114964] [2019-10-14 21:42:03,838 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564786074] [2019-10-14 21:42:03,838 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 21:42:03,880 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-10-14 21:42:03,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:03,882 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:03,884 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:03,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:42:03,908 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 21:42:03,908 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2019-10-14 21:42:03,908 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820112843] [2019-10-14 21:42:03,909 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:03,909 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:03,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:03,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:42:03,910 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand 4 states. [2019-10-14 21:42:03,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:03,947 INFO L93 Difference]: Finished difference Result 96 states and 117 transitions. [2019-10-14 21:42:03,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:42:03,948 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-14 21:42:03,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:03,949 INFO L225 Difference]: With dead ends: 96 [2019-10-14 21:42:03,950 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:42:03,951 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:42:03,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:42:03,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-14 21:42:03,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:42:03,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2019-10-14 21:42:03,960 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 18 [2019-10-14 21:42:03,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:03,960 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2019-10-14 21:42:03,961 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:03,961 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2019-10-14 21:42:03,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:42:03,962 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:03,962 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:04,167 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:04,167 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:04,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:04,168 INFO L82 PathProgramCache]: Analyzing trace with hash 723083025, now seen corresponding path program 1 times [2019-10-14 21:42:04,168 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:04,168 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123584678] [2019-10-14 21:42:04,168 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:04,169 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:04,169 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:04,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-14 21:42:04,262 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123584678] [2019-10-14 21:42:04,262 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:04,262 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-14 21:42:04,262 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879990383] [2019-10-14 21:42:04,263 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:42:04,263 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:04,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:42:04,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:42:04,264 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand 5 states. [2019-10-14 21:42:04,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:04,405 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2019-10-14 21:42:04,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:42:04,405 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2019-10-14 21:42:04,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:04,406 INFO L225 Difference]: With dead ends: 98 [2019-10-14 21:42:04,407 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 21:42:04,407 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:04,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 21:42:04,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2019-10-14 21:42:04,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-14 21:42:04,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2019-10-14 21:42:04,416 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 39 [2019-10-14 21:42:04,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:04,417 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2019-10-14 21:42:04,417 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:42:04,417 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2019-10-14 21:42:04,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:42:04,420 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:04,420 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:04,420 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:04,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:04,421 INFO L82 PathProgramCache]: Analyzing trace with hash -648100369, now seen corresponding path program 1 times [2019-10-14 21:42:04,421 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:04,422 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702167098] [2019-10-14 21:42:04,422 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:04,422 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:04,422 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:04,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:04,574 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702167098] [2019-10-14 21:42:04,575 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109293981] [2019-10-14 21:42:04,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:42:04,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:04,637 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:04,640 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:04,665 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:04,666 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:04,666 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 8 [2019-10-14 21:42:04,666 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330556362] [2019-10-14 21:42:04,667 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:42:04,667 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:04,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:42:04,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:42:04,669 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand 8 states. [2019-10-14 21:42:04,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:04,889 INFO L93 Difference]: Finished difference Result 116 states and 140 transitions. [2019-10-14 21:42:04,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:42:04,891 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 41 [2019-10-14 21:42:04,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:04,892 INFO L225 Difference]: With dead ends: 116 [2019-10-14 21:42:04,892 INFO L226 Difference]: Without dead ends: 74 [2019-10-14 21:42:04,894 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:42:04,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-14 21:42:04,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 55. [2019-10-14 21:42:04,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 21:42:04,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2019-10-14 21:42:04,902 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 41 [2019-10-14 21:42:04,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:04,902 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2019-10-14 21:42:04,902 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:42:04,902 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2019-10-14 21:42:04,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-14 21:42:04,904 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:04,904 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:05,107 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:05,108 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:05,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:05,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1873779725, now seen corresponding path program 2 times [2019-10-14 21:42:05,109 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:05,110 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755927041] [2019-10-14 21:42:05,110 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:05,110 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:05,110 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:05,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,219 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:05,220 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755927041] [2019-10-14 21:42:05,220 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966548978] [2019-10-14 21:42:05,220 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 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 21:42:05,296 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:05,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:05,297 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:05,303 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:05,350 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-14 21:42:05,351 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:05,351 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4] total 10 [2019-10-14 21:42:05,351 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557019626] [2019-10-14 21:42:05,352 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:42:05,352 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:05,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:42:05,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:42:05,353 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 10 states. [2019-10-14 21:42:05,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:05,619 INFO L93 Difference]: Finished difference Result 147 states and 183 transitions. [2019-10-14 21:42:05,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:05,620 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2019-10-14 21:42:05,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:05,622 INFO L225 Difference]: With dead ends: 147 [2019-10-14 21:42:05,622 INFO L226 Difference]: Without dead ends: 105 [2019-10-14 21:42:05,623 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:05,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2019-10-14 21:42:05,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 67. [2019-10-14 21:42:05,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 21:42:05,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2019-10-14 21:42:05,633 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 43 [2019-10-14 21:42:05,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:05,633 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2019-10-14 21:42:05,633 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:42:05,633 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2019-10-14 21:42:05,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 21:42:05,635 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:05,636 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:05,844 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:05,844 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:05,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:05,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1764017907, now seen corresponding path program 1 times [2019-10-14 21:42:05,846 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:05,846 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613656392] [2019-10-14 21:42:05,847 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:05,847 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:05,847 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:05,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:05,983 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:42:05,984 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613656392] [2019-10-14 21:42:05,984 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:05,984 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-14 21:42:05,984 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387621851] [2019-10-14 21:42:05,985 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:42:05,985 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:05,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:42:05,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:05,988 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 6 states. [2019-10-14 21:42:06,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:06,127 INFO L93 Difference]: Finished difference Result 110 states and 134 transitions. [2019-10-14 21:42:06,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:42:06,127 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 57 [2019-10-14 21:42:06,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:06,130 INFO L225 Difference]: With dead ends: 110 [2019-10-14 21:42:06,130 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:42:06,131 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:42:06,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:42:06,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2019-10-14 21:42:06,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 21:42:06,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2019-10-14 21:42:06,160 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 57 [2019-10-14 21:42:06,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:06,160 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2019-10-14 21:42:06,160 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:42:06,160 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2019-10-14 21:42:06,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 21:42:06,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:06,162 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:06,162 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:06,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:06,163 INFO L82 PathProgramCache]: Analyzing trace with hash -271902692, now seen corresponding path program 1 times [2019-10-14 21:42:06,163 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:06,163 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389583255] [2019-10-14 21:42:06,163 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:06,163 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:06,164 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:06,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,303 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:42:06,304 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389583255] [2019-10-14 21:42:06,304 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764773948] [2019-10-14 21:42:06,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:42:06,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,371 INFO L256 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:42:06,374 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:06,386 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:42:06,386 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:06,387 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2019-10-14 21:42:06,387 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23157383] [2019-10-14 21:42:06,387 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:42:06,388 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:06,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:42:06,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:42:06,388 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand 10 states. [2019-10-14 21:42:06,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:06,614 INFO L93 Difference]: Finished difference Result 164 states and 202 transitions. [2019-10-14 21:42:06,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:42:06,614 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 57 [2019-10-14 21:42:06,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:06,617 INFO L225 Difference]: With dead ends: 164 [2019-10-14 21:42:06,617 INFO L226 Difference]: Without dead ends: 106 [2019-10-14 21:42:06,618 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:06,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2019-10-14 21:42:06,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 75. [2019-10-14 21:42:06,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-10-14 21:42:06,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2019-10-14 21:42:06,627 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 57 [2019-10-14 21:42:06,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:06,627 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2019-10-14 21:42:06,627 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:42:06,627 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2019-10-14 21:42:06,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:42:06,628 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:06,629 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:06,832 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:06,833 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:06,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:06,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1503130170, now seen corresponding path program 2 times [2019-10-14 21:42:06,835 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:06,835 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506495920] [2019-10-14 21:42:06,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:06,836 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:06,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:06,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:06,943 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:42:06,943 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506495920] [2019-10-14 21:42:06,943 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857587639] [2019-10-14 21:42:06,943 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 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 21:42:07,006 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:07,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:07,008 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:42:07,011 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:07,042 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:42:07,042 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:07,042 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2019-10-14 21:42:07,043 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200555836] [2019-10-14 21:42:07,043 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:42:07,043 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:07,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:42:07,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:42:07,044 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 11 states. [2019-10-14 21:42:07,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:07,315 INFO L93 Difference]: Finished difference Result 172 states and 212 transitions. [2019-10-14 21:42:07,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:07,316 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 59 [2019-10-14 21:42:07,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:07,317 INFO L225 Difference]: With dead ends: 172 [2019-10-14 21:42:07,317 INFO L226 Difference]: Without dead ends: 114 [2019-10-14 21:42:07,318 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:42:07,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-14 21:42:07,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 77. [2019-10-14 21:42:07,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-14 21:42:07,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 91 transitions. [2019-10-14 21:42:07,327 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 91 transitions. Word has length 59 [2019-10-14 21:42:07,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:07,327 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 91 transitions. [2019-10-14 21:42:07,327 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:42:07,328 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 91 transitions. [2019-10-14 21:42:07,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-14 21:42:07,329 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:07,329 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:07,537 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:07,537 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:07,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:07,537 INFO L82 PathProgramCache]: Analyzing trace with hash -2087273256, now seen corresponding path program 3 times [2019-10-14 21:42:07,538 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:07,538 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940693184] [2019-10-14 21:42:07,538 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:07,538 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:07,538 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:07,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:07,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:07,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:07,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:07,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:07,646 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:42:07,647 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940693184] [2019-10-14 21:42:07,647 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579681526] [2019-10-14 21:42:07,647 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 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 21:42:07,703 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:42:07,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:07,704 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:42:07,707 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:07,824 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-14 21:42:07,824 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:07,824 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2019-10-14 21:42:07,824 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137420913] [2019-10-14 21:42:07,825 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:42:07,825 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:07,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:42:07,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:42:07,826 INFO L87 Difference]: Start difference. First operand 77 states and 91 transitions. Second operand 17 states. [2019-10-14 21:42:08,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:08,467 INFO L93 Difference]: Finished difference Result 198 states and 247 transitions. [2019-10-14 21:42:08,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:42:08,467 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 61 [2019-10-14 21:42:08,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:08,468 INFO L225 Difference]: With dead ends: 198 [2019-10-14 21:42:08,469 INFO L226 Difference]: Without dead ends: 135 [2019-10-14 21:42:08,470 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=240, Invalid=752, Unknown=0, NotChecked=0, Total=992 [2019-10-14 21:42:08,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2019-10-14 21:42:08,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 78. [2019-10-14 21:42:08,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-10-14 21:42:08,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 92 transitions. [2019-10-14 21:42:08,488 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 92 transitions. Word has length 61 [2019-10-14 21:42:08,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:08,488 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 92 transitions. [2019-10-14 21:42:08,489 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:42:08,489 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 92 transitions. [2019-10-14 21:42:08,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 21:42:08,493 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:08,493 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:08,693 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:08,694 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:08,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:08,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1917828293, now seen corresponding path program 3 times [2019-10-14 21:42:08,694 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:08,694 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445518921] [2019-10-14 21:42:08,695 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:08,695 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:08,695 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:08,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:08,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:08,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:08,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:08,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:08,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:08,824 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:42:08,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445518921] [2019-10-14 21:42:08,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000060435] [2019-10-14 21:42:08,825 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 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 21:42:08,892 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 21:42:08,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:08,893 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:42:08,896 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:09,009 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-14 21:42:09,009 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 21:42:09,009 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10] total 17 [2019-10-14 21:42:09,010 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146332483] [2019-10-14 21:42:09,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:42:09,010 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:09,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:42:09,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=235, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:42:09,011 INFO L87 Difference]: Start difference. First operand 78 states and 92 transitions. Second operand 10 states. [2019-10-14 21:42:09,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:09,245 INFO L93 Difference]: Finished difference Result 144 states and 183 transitions. [2019-10-14 21:42:09,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:42:09,246 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2019-10-14 21:42:09,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:09,248 INFO L225 Difference]: With dead ends: 144 [2019-10-14 21:42:09,248 INFO L226 Difference]: Without dead ends: 126 [2019-10-14 21:42:09,249 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:42:09,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-14 21:42:09,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 92. [2019-10-14 21:42:09,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-14 21:42:09,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 110 transitions. [2019-10-14 21:42:09,275 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 110 transitions. Word has length 68 [2019-10-14 21:42:09,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:09,276 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 110 transitions. [2019-10-14 21:42:09,276 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:42:09,276 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 110 transitions. [2019-10-14 21:42:09,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 21:42:09,277 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:09,277 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:09,481 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:09,482 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:09,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:09,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1578451652, now seen corresponding path program 1 times [2019-10-14 21:42:09,483 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:09,483 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677368279] [2019-10-14 21:42:09,483 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:09,483 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:09,483 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:09,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,567 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:42:09,567 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677368279] [2019-10-14 21:42:09,567 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:09,568 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-14 21:42:09,568 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178049800] [2019-10-14 21:42:09,568 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:42:09,568 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:09,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:42:09,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:09,569 INFO L87 Difference]: Start difference. First operand 92 states and 110 transitions. Second operand 6 states. [2019-10-14 21:42:09,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:09,703 INFO L93 Difference]: Finished difference Result 139 states and 168 transitions. [2019-10-14 21:42:09,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:42:09,703 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 68 [2019-10-14 21:42:09,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:09,705 INFO L225 Difference]: With dead ends: 139 [2019-10-14 21:42:09,705 INFO L226 Difference]: Without dead ends: 92 [2019-10-14 21:42:09,705 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:42:09,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-10-14 21:42:09,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2019-10-14 21:42:09,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-14 21:42:09,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2019-10-14 21:42:09,713 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 68 [2019-10-14 21:42:09,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:09,713 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2019-10-14 21:42:09,714 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:42:09,714 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2019-10-14 21:42:09,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-14 21:42:09,715 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:09,715 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:09,715 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:09,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:09,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1932290267, now seen corresponding path program 1 times [2019-10-14 21:42:09,716 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:09,716 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634024148] [2019-10-14 21:42:09,716 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:09,716 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:09,716 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:09,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,829 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:09,829 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634024148] [2019-10-14 21:42:09,830 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802301622] [2019-10-14 21:42:09,830 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:42:09,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:09,912 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:42:09,914 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:09,938 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:09,939 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:09,939 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 13 [2019-10-14 21:42:09,939 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565911202] [2019-10-14 21:42:09,940 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:42:09,940 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:09,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:42:09,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:42:09,941 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand 13 states. [2019-10-14 21:42:10,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:10,282 INFO L93 Difference]: Finished difference Result 214 states and 260 transitions. [2019-10-14 21:42:10,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:42:10,283 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 71 [2019-10-14 21:42:10,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:10,284 INFO L225 Difference]: With dead ends: 214 [2019-10-14 21:42:10,284 INFO L226 Difference]: Without dead ends: 143 [2019-10-14 21:42:10,285 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:42:10,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-10-14 21:42:10,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 94. [2019-10-14 21:42:10,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-10-14 21:42:10,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 109 transitions. [2019-10-14 21:42:10,295 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 109 transitions. Word has length 71 [2019-10-14 21:42:10,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:10,295 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 109 transitions. [2019-10-14 21:42:10,295 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:42:10,296 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 109 transitions. [2019-10-14 21:42:10,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-10-14 21:42:10,297 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:10,297 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:10,501 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:10,502 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:10,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:10,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1104241859, now seen corresponding path program 2 times [2019-10-14 21:42:10,502 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:10,502 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719579962] [2019-10-14 21:42:10,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:10,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:10,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:10,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:10,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:10,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:10,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:10,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:10,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:10,671 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:10,671 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719579962] [2019-10-14 21:42:10,672 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995714827] [2019-10-14 21:42:10,672 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 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 21:42:10,761 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:10,761 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:10,763 INFO L256 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:42:10,766 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:10,785 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:10,785 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:10,786 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 14 [2019-10-14 21:42:10,786 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409390523] [2019-10-14 21:42:10,787 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:42:10,787 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:10,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:42:10,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:10,788 INFO L87 Difference]: Start difference. First operand 94 states and 109 transitions. Second operand 14 states. [2019-10-14 21:42:11,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:11,107 INFO L93 Difference]: Finished difference Result 222 states and 270 transitions. [2019-10-14 21:42:11,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:42:11,107 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 73 [2019-10-14 21:42:11,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:11,109 INFO L225 Difference]: With dead ends: 222 [2019-10-14 21:42:11,109 INFO L226 Difference]: Without dead ends: 151 [2019-10-14 21:42:11,110 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:42:11,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2019-10-14 21:42:11,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 96. [2019-10-14 21:42:11,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2019-10-14 21:42:11,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 111 transitions. [2019-10-14 21:42:11,119 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 111 transitions. Word has length 73 [2019-10-14 21:42:11,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:11,119 INFO L462 AbstractCegarLoop]: Abstraction has 96 states and 111 transitions. [2019-10-14 21:42:11,119 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:42:11,119 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 111 transitions. [2019-10-14 21:42:11,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 21:42:11,120 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:11,120 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:11,324 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:11,325 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:11,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:11,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1366146335, now seen corresponding path program 3 times [2019-10-14 21:42:11,326 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:11,326 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974681562] [2019-10-14 21:42:11,326 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:11,326 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:11,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:11,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:11,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:11,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:11,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:11,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:11,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:11,468 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:11,468 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974681562] [2019-10-14 21:42:11,468 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815590292] [2019-10-14 21:42:11,468 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 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 21:42:11,543 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:42:11,543 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:11,544 INFO L256 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:11,548 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:11,585 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2019-10-14 21:42:11,586 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:11,586 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2019-10-14 21:42:11,586 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918617022] [2019-10-14 21:42:11,587 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:42:11,587 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:11,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:42:11,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=193, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:42:11,588 INFO L87 Difference]: Start difference. First operand 96 states and 111 transitions. Second operand 17 states. [2019-10-14 21:42:12,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:12,079 INFO L93 Difference]: Finished difference Result 285 states and 360 transitions. [2019-10-14 21:42:12,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:42:12,080 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 75 [2019-10-14 21:42:12,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:12,081 INFO L225 Difference]: With dead ends: 285 [2019-10-14 21:42:12,082 INFO L226 Difference]: Without dead ends: 214 [2019-10-14 21:42:12,083 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:42:12,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2019-10-14 21:42:12,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 115. [2019-10-14 21:42:12,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-10-14 21:42:12,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 138 transitions. [2019-10-14 21:42:12,094 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 138 transitions. Word has length 75 [2019-10-14 21:42:12,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:12,094 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 138 transitions. [2019-10-14 21:42:12,095 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:42:12,095 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 138 transitions. [2019-10-14 21:42:12,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2019-10-14 21:42:12,096 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:12,096 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:12,306 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:12,307 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:12,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:12,307 INFO L82 PathProgramCache]: Analyzing trace with hash 349741488, now seen corresponding path program 1 times [2019-10-14 21:42:12,308 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:12,308 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879192164] [2019-10-14 21:42:12,308 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:12,309 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:12,309 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:12,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,487 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:42:12,488 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879192164] [2019-10-14 21:42:12,488 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933368642] [2019-10-14 21:42:12,489 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:42:12,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:12,597 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:42:12,600 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:12,637 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:42:12,638 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:12,638 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 16 [2019-10-14 21:42:12,638 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843511638] [2019-10-14 21:42:12,641 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:42:12,641 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:12,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:42:12,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:42:12,642 INFO L87 Difference]: Start difference. First operand 115 states and 138 transitions. Second operand 16 states. [2019-10-14 21:42:12,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:12,988 INFO L93 Difference]: Finished difference Result 272 states and 340 transitions. [2019-10-14 21:42:12,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:42:12,989 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 89 [2019-10-14 21:42:12,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:12,991 INFO L225 Difference]: With dead ends: 272 [2019-10-14 21:42:12,991 INFO L226 Difference]: Without dead ends: 184 [2019-10-14 21:42:12,994 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=114, Invalid=192, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:42:12,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2019-10-14 21:42:13,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 117. [2019-10-14 21:42:13,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2019-10-14 21:42:13,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 140 transitions. [2019-10-14 21:42:13,006 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 140 transitions. Word has length 89 [2019-10-14 21:42:13,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:13,007 INFO L462 AbstractCegarLoop]: Abstraction has 117 states and 140 transitions. [2019-10-14 21:42:13,007 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:42:13,007 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 140 transitions. [2019-10-14 21:42:13,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-10-14 21:42:13,009 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:13,009 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:13,213 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:13,214 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:13,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:13,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1006271538, now seen corresponding path program 2 times [2019-10-14 21:42:13,215 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:13,216 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031487073] [2019-10-14 21:42:13,217 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:13,217 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:13,217 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:13,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:13,410 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:42:13,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031487073] [2019-10-14 21:42:13,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977005495] [2019-10-14 21:42:13,413 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 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 21:42:13,488 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:13,488 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:13,489 INFO L256 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:42:13,491 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:13,508 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:42:13,509 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:13,509 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 17 [2019-10-14 21:42:13,509 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23126142] [2019-10-14 21:42:13,510 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:42:13,510 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:13,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:42:13,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:42:13,511 INFO L87 Difference]: Start difference. First operand 117 states and 140 transitions. Second operand 17 states. [2019-10-14 21:42:13,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:13,840 INFO L93 Difference]: Finished difference Result 280 states and 350 transitions. [2019-10-14 21:42:13,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:42:13,841 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 91 [2019-10-14 21:42:13,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:13,843 INFO L225 Difference]: With dead ends: 280 [2019-10-14 21:42:13,843 INFO L226 Difference]: Without dead ends: 192 [2019-10-14 21:42:13,844 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=129, Invalid=213, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:42:13,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2019-10-14 21:42:13,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 119. [2019-10-14 21:42:13,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-10-14 21:42:13,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 142 transitions. [2019-10-14 21:42:13,856 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 142 transitions. Word has length 91 [2019-10-14 21:42:13,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:13,857 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 142 transitions. [2019-10-14 21:42:13,857 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:42:13,857 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 142 transitions. [2019-10-14 21:42:13,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-14 21:42:13,859 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:13,859 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:14,064 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:14,064 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:14,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:14,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1535268460, now seen corresponding path program 3 times [2019-10-14 21:42:14,065 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:14,065 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101267560] [2019-10-14 21:42:14,065 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:14,066 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:14,066 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:14,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:14,267 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:42:14,267 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101267560] [2019-10-14 21:42:14,268 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125231583] [2019-10-14 21:42:14,268 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 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 21:42:14,335 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:42:14,336 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:14,338 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 66 conjunts are in the unsatisfiable core [2019-10-14 21:42:14,341 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:14,846 INFO L341 Elim1Store]: treesize reduction 44, result has 57.3 percent of original size [2019-10-14 21:42:14,847 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 74 [2019-10-14 21:42:14,848 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:14,849 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:14,852 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:42:14,900 INFO L567 ElimStorePlain]: treesize reduction 53, result has 56.2 percent of original size [2019-10-14 21:42:14,901 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:14,904 INFO L496 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 4 dim-0 vars, and 1 xjuncts. [2019-10-14 21:42:14,904 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:51, output treesize:68 [2019-10-14 21:42:14,905 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:14,976 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:14,977 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:22,887 WARN L191 SmtUtils]: Spent 7.76 s on a formula simplification. DAG size of input: 44 DAG size of output: 33 [2019-10-14 21:42:23,063 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:23,084 INFO L392 ElimStorePlain]: Different costs {2=[|#memory_int|], 12=[v_prenex_3]} [2019-10-14 21:42:23,090 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-14 21:42:23,090 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:42:23,111 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:42:23,116 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:42:23,117 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:42:23,146 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:42:23,147 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 69 [2019-10-14 21:42:23,148 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-14 21:42:23,182 INFO L567 ElimStorePlain]: treesize reduction 4, result has 86.7 percent of original size [2019-10-14 21:42:23,184 INFO L496 ElimStorePlain]: Start of recursive call 1: 8 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:42:23,185 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 10 variables, input treesize:83, output treesize:4 [2019-10-14 21:42:23,229 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:42:23,373 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:42:23,374 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:23,374 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 36 [2019-10-14 21:42:23,374 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921022116] [2019-10-14 21:42:23,375 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 21:42:23,375 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:23,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 21:42:23,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1073, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:42:23,376 INFO L87 Difference]: Start difference. First operand 119 states and 142 transitions. Second operand 36 states. [2019-10-14 21:42:28,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:28,839 INFO L93 Difference]: Finished difference Result 370 states and 487 transitions. [2019-10-14 21:42:28,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-14 21:42:28,839 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 93 [2019-10-14 21:42:28,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:28,843 INFO L225 Difference]: With dead ends: 370 [2019-10-14 21:42:28,843 INFO L226 Difference]: Without dead ends: 282 [2019-10-14 21:42:28,846 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1028 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=874, Invalid=4238, Unknown=0, NotChecked=0, Total=5112 [2019-10-14 21:42:28,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2019-10-14 21:42:28,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 152. [2019-10-14 21:42:28,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2019-10-14 21:42:28,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 187 transitions. [2019-10-14 21:42:28,863 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 187 transitions. Word has length 93 [2019-10-14 21:42:28,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:28,863 INFO L462 AbstractCegarLoop]: Abstraction has 152 states and 187 transitions. [2019-10-14 21:42:28,863 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 21:42:28,863 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 187 transitions. [2019-10-14 21:42:28,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2019-10-14 21:42:28,865 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:28,865 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:29,069 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:29,069 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:29,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:29,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1755336388, now seen corresponding path program 1 times [2019-10-14 21:42:29,070 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:29,071 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704787567] [2019-10-14 21:42:29,071 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:29,071 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:29,072 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:29,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,166 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2019-10-14 21:42:29,167 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704787567] [2019-10-14 21:42:29,167 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288484548] [2019-10-14 21:42:29,167 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:42:29,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:29,253 INFO L256 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:42:29,255 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:29,517 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-10-14 21:42:29,518 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:29,518 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16] total 22 [2019-10-14 21:42:29,518 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545740683] [2019-10-14 21:42:29,519 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:42:29,520 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:29,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:42:29,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=329, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:42:29,521 INFO L87 Difference]: Start difference. First operand 152 states and 187 transitions. Second operand 22 states. [2019-10-14 21:42:31,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:31,366 INFO L93 Difference]: Finished difference Result 455 states and 586 transitions. [2019-10-14 21:42:31,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-10-14 21:42:31,367 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 98 [2019-10-14 21:42:31,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:31,369 INFO L225 Difference]: With dead ends: 455 [2019-10-14 21:42:31,369 INFO L226 Difference]: Without dead ends: 307 [2019-10-14 21:42:31,372 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1807 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1574, Invalid=4906, Unknown=0, NotChecked=0, Total=6480 [2019-10-14 21:42:31,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2019-10-14 21:42:31,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 156. [2019-10-14 21:42:31,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2019-10-14 21:42:31,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 191 transitions. [2019-10-14 21:42:31,388 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 191 transitions. Word has length 98 [2019-10-14 21:42:31,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:31,389 INFO L462 AbstractCegarLoop]: Abstraction has 156 states and 191 transitions. [2019-10-14 21:42:31,389 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:42:31,389 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 191 transitions. [2019-10-14 21:42:31,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-10-14 21:42:31,391 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:31,391 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:31,594 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:31,595 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:31,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:31,595 INFO L82 PathProgramCache]: Analyzing trace with hash 979044322, now seen corresponding path program 4 times [2019-10-14 21:42:31,596 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:31,596 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663779819] [2019-10-14 21:42:31,596 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:31,597 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:31,597 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:31,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:31,785 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:42:31,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663779819] [2019-10-14 21:42:31,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022235891] [2019-10-14 21:42:31,786 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 21:42:31,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:31,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:31,880 INFO L256 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:42:31,882 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:31,900 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:42:31,901 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:31,901 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 20 [2019-10-14 21:42:31,901 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882491610] [2019-10-14 21:42:31,902 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:42:31,902 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:31,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:42:31,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:42:31,903 INFO L87 Difference]: Start difference. First operand 156 states and 191 transitions. Second operand 20 states. [2019-10-14 21:42:32,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:32,494 INFO L93 Difference]: Finished difference Result 385 states and 485 transitions. [2019-10-14 21:42:32,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:42:32,495 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 100 [2019-10-14 21:42:32,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:32,498 INFO L225 Difference]: With dead ends: 385 [2019-10-14 21:42:32,498 INFO L226 Difference]: Without dead ends: 264 [2019-10-14 21:42:32,499 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=180, Invalid=282, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:42:32,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2019-10-14 21:42:32,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 158. [2019-10-14 21:42:32,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2019-10-14 21:42:32,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 193 transitions. [2019-10-14 21:42:32,512 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 193 transitions. Word has length 100 [2019-10-14 21:42:32,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:32,513 INFO L462 AbstractCegarLoop]: Abstraction has 158 states and 193 transitions. [2019-10-14 21:42:32,513 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:42:32,513 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 193 transitions. [2019-10-14 21:42:32,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-10-14 21:42:32,514 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:32,514 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:32,718 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:32,718 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:32,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:32,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1384007428, now seen corresponding path program 5 times [2019-10-14 21:42:32,719 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:32,719 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133697111] [2019-10-14 21:42:32,720 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:32,720 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:32,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:32,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:32,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:32,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:33,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:33,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:33,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:33,055 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:42:33,055 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133697111] [2019-10-14 21:42:33,055 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014603774] [2019-10-14 21:42:33,056 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 21:42:33,306 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2019-10-14 21:42:33,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:33,310 INFO L256 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:42:33,313 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:33,589 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 26 proven. 15 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-10-14 21:42:33,589 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:33,590 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 29 [2019-10-14 21:42:33,590 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705195323] [2019-10-14 21:42:33,593 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 21:42:33,593 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:33,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 21:42:33,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:42:33,595 INFO L87 Difference]: Start difference. First operand 158 states and 193 transitions. Second operand 29 states. [2019-10-14 21:42:35,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:35,221 INFO L93 Difference]: Finished difference Result 381 states and 483 transitions. [2019-10-14 21:42:35,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-14 21:42:35,222 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 102 [2019-10-14 21:42:35,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:35,224 INFO L225 Difference]: With dead ends: 381 [2019-10-14 21:42:35,224 INFO L226 Difference]: Without dead ends: 260 [2019-10-14 21:42:35,226 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=640, Invalid=2330, Unknown=0, NotChecked=0, Total=2970 [2019-10-14 21:42:35,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2019-10-14 21:42:35,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 143. [2019-10-14 21:42:35,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2019-10-14 21:42:35,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2019-10-14 21:42:35,239 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 102 [2019-10-14 21:42:35,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:35,240 INFO L462 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2019-10-14 21:42:35,240 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 21:42:35,240 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2019-10-14 21:42:35,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2019-10-14 21:42:35,241 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:35,242 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:35,449 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:35,450 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:35,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:35,450 INFO L82 PathProgramCache]: Analyzing trace with hash 315553691, now seen corresponding path program 1 times [2019-10-14 21:42:35,450 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:35,450 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046755206] [2019-10-14 21:42:35,450 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,451 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,451 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:35,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,565 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2019-10-14 21:42:35,566 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046755206] [2019-10-14 21:42:35,566 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394309917] [2019-10-14 21:42:35,566 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:42:35,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,663 INFO L256 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:42:35,665 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:35,909 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:42:35,910 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:35,910 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 19] total 26 [2019-10-14 21:42:35,910 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198436259] [2019-10-14 21:42:35,911 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 21:42:35,911 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:35,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 21:42:35,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=463, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:42:35,912 INFO L87 Difference]: Start difference. First operand 143 states and 170 transitions. Second operand 26 states. [2019-10-14 21:42:39,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:39,601 INFO L93 Difference]: Finished difference Result 554 states and 699 transitions. [2019-10-14 21:42:39,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2019-10-14 21:42:39,603 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 112 [2019-10-14 21:42:39,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:39,607 INFO L225 Difference]: With dead ends: 554 [2019-10-14 21:42:39,607 INFO L226 Difference]: Without dead ends: 398 [2019-10-14 21:42:39,613 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3567, Invalid=13463, Unknown=0, NotChecked=0, Total=17030 [2019-10-14 21:42:39,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2019-10-14 21:42:39,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 153. [2019-10-14 21:42:39,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2019-10-14 21:42:39,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 182 transitions. [2019-10-14 21:42:39,633 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 182 transitions. Word has length 112 [2019-10-14 21:42:39,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:39,633 INFO L462 AbstractCegarLoop]: Abstraction has 153 states and 182 transitions. [2019-10-14 21:42:39,633 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 21:42:39,633 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 182 transitions. [2019-10-14 21:42:39,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-10-14 21:42:39,634 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:39,635 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:39,841 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:39,842 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:39,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:39,842 INFO L82 PathProgramCache]: Analyzing trace with hash -320376327, now seen corresponding path program 4 times [2019-10-14 21:42:39,843 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:39,843 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783403137] [2019-10-14 21:42:39,843 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,843 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:39,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,103 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:42:40,103 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783403137] [2019-10-14 21:42:40,106 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118684572] [2019-10-14 21:42:40,106 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 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 21:42:40,217 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:40,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:40,219 INFO L256 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:42:40,221 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:40,257 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:42:40,258 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:40,258 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 23 [2019-10-14 21:42:40,258 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99544194] [2019-10-14 21:42:40,259 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:42:40,259 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:40,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:42:40,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:40,260 INFO L87 Difference]: Start difference. First operand 153 states and 182 transitions. Second operand 23 states. [2019-10-14 21:42:40,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:40,881 INFO L93 Difference]: Finished difference Result 466 states and 578 transitions. [2019-10-14 21:42:40,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 21:42:40,882 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 114 [2019-10-14 21:42:40,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:40,885 INFO L225 Difference]: With dead ends: 466 [2019-10-14 21:42:40,885 INFO L226 Difference]: Without dead ends: 354 [2019-10-14 21:42:40,886 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=240, Invalid=360, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:42:40,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2019-10-14 21:42:40,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 155. [2019-10-14 21:42:40,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2019-10-14 21:42:40,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 184 transitions. [2019-10-14 21:42:40,905 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 184 transitions. Word has length 114 [2019-10-14 21:42:40,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:40,905 INFO L462 AbstractCegarLoop]: Abstraction has 155 states and 184 transitions. [2019-10-14 21:42:40,905 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:42:40,905 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 184 transitions. [2019-10-14 21:42:40,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-10-14 21:42:40,908 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:40,908 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:41,113 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:41,114 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:41,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:41,114 INFO L82 PathProgramCache]: Analyzing trace with hash 2048167323, now seen corresponding path program 5 times [2019-10-14 21:42:41,114 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:41,114 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13202278] [2019-10-14 21:42:41,114 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,114 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,115 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:41,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,384 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:42:41,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13202278] [2019-10-14 21:42:41,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461802673] [2019-10-14 21:42:41,384 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 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 21:42:42,103 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2019-10-14 21:42:42,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:42,106 INFO L256 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:42:42,108 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:42,128 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:42:42,128 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:42,129 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21] total 24 [2019-10-14 21:42:42,129 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192798088] [2019-10-14 21:42:42,129 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:42:42,130 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:42,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:42:42,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:42:42,130 INFO L87 Difference]: Start difference. First operand 155 states and 184 transitions. Second operand 24 states.