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/loops-crafted-1/nested5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 20:09:24,161 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 20:09:24,163 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 20:09:24,174 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 20:09:24,174 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 20:09:24,175 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 20:09:24,177 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 20:09:24,178 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 20:09:24,180 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 20:09:24,181 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 20:09:24,182 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 20:09:24,183 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 20:09:24,183 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 20:09:24,184 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 20:09:24,185 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 20:09:24,186 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 20:09:24,186 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 20:09:24,187 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 20:09:24,189 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 20:09:24,191 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 20:09:24,192 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 20:09:24,193 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 20:09:24,194 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 20:09:24,195 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 20:09:24,197 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-03 20:09:24,197 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-03 20:09:24,198 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-03 20:09:24,198 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-03 20:09:24,199 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-03 20:09:24,200 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-03 20:09:24,200 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 20:09:24,200 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 20:09:24,201 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 20:09:24,202 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 20:09:24,203 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 20:09:24,203 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 20:09:24,204 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 20:09:24,204 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 20:09:24,204 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 20:09:24,205 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 20:09:24,205 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 20:09:24,206 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 [2019-09-03 20:09:24,219 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 20:09:24,220 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 20:09:24,221 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-03 20:09:24,221 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-03 20:09:24,221 INFO L138 SettingsManager]: * Use SBE=true [2019-09-03 20:09:24,221 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 20:09:24,222 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 20:09:24,222 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-03 20:09:24,222 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 20:09:24,222 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 20:09:24,222 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 20:09:24,223 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 20:09:24,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 20:09:24,223 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 20:09:24,223 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 20:09:24,223 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-03 20:09:24,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 20:09:24,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 20:09:24,224 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 20:09:24,224 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-03 20:09:24,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-03 20:09:24,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:09:24,225 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 20:09:24,225 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 20:09:24,225 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-03 20:09:24,225 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-03 20:09:24,226 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 20:09:24,226 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 20:09:24,226 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-03 20:09:24,255 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 20:09:24,271 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 20:09:24,276 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 20:09:24,277 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 20:09:24,278 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 20:09:24,278 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2019-09-03 20:09:24,334 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f28700f33/7c17d411ab6543e2a5cb162a9d8aec16/FLAG946a1f93b [2019-09-03 20:09:24,747 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 20:09:24,748 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2019-09-03 20:09:24,753 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f28700f33/7c17d411ab6543e2a5cb162a9d8aec16/FLAG946a1f93b [2019-09-03 20:09:25,151 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f28700f33/7c17d411ab6543e2a5cb162a9d8aec16 [2019-09-03 20:09:25,160 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 20:09:25,162 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 20:09:25,163 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 20:09:25,163 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 20:09:25,167 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 20:09:25,168 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d634e4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25, skipping insertion in model container [2019-09-03 20:09:25,171 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,178 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 20:09:25,197 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 20:09:25,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:09:25,417 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 20:09:25,442 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:09:25,453 INFO L192 MainTranslator]: Completed translation [2019-09-03 20:09:25,454 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25 WrapperNode [2019-09-03 20:09:25,454 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 20:09:25,454 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 20:09:25,454 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 20:09:25,454 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 20:09:25,540 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,541 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,547 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,547 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,551 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,558 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (1/1) ... [2019-09-03 20:09:25,559 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 20:09:25,560 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 20:09:25,560 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 20:09:25,560 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 20:09:25,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (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 [2019-09-03 20:09:25,611 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 20:09:25,611 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 20:09:25,611 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 20:09:25,611 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 20:09:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 20:09:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 20:09:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 20:09:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 20:09:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 20:09:25,841 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 20:09:25,841 INFO L283 CfgBuilder]: Removed 5 assume(true) statements. [2019-09-03 20:09:25,843 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:09:25 BoogieIcfgContainer [2019-09-03 20:09:25,843 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 20:09:25,852 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 20:09:25,852 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 20:09:25,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 20:09:25,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 08:09:25" (1/3) ... [2019-09-03 20:09:25,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41d84bcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:09:25, skipping insertion in model container [2019-09-03 20:09:25,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:09:25" (2/3) ... [2019-09-03 20:09:25,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41d84bcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:09:25, skipping insertion in model container [2019-09-03 20:09:25,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:09:25" (3/3) ... [2019-09-03 20:09:25,867 INFO L109 eAbstractionObserver]: Analyzing ICFG nested5-2.c [2019-09-03 20:09:25,887 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 20:09:25,900 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 20:09:25,919 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 20:09:25,947 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-03 20:09:25,948 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 20:09:25,948 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-03 20:09:25,948 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 20:09:25,948 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 20:09:25,949 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 20:09:25,949 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 20:09:25,949 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 20:09:25,949 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 20:09:25,966 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-09-03 20:09:25,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 20:09:25,971 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:25,972 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:25,974 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:25,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:25,978 INFO L82 PathProgramCache]: Analyzing trace with hash -84144223, now seen corresponding path program 1 times [2019-09-03 20:09:25,980 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:25,980 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:26,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,016 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:09:26,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:26,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:26,092 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:09:26,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-03 20:09:26,095 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-03 20:09:26,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-03 20:09:26,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 20:09:26,107 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-09-03 20:09:26,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:26,128 INFO L93 Difference]: Finished difference Result 47 states and 68 transitions. [2019-09-03 20:09:26,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-03 20:09:26,130 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2019-09-03 20:09:26,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:26,138 INFO L225 Difference]: With dead ends: 47 [2019-09-03 20:09:26,139 INFO L226 Difference]: Without dead ends: 22 [2019-09-03 20:09:26,142 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 20:09:26,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-03 20:09:26,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-09-03 20:09:26,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-03 20:09:26,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-09-03 20:09:26,180 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2019-09-03 20:09:26,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:26,180 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-09-03 20:09:26,181 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-03 20:09:26,181 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-09-03 20:09:26,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 20:09:26,182 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:26,182 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:26,182 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:26,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:26,183 INFO L82 PathProgramCache]: Analyzing trace with hash -89685349, now seen corresponding path program 1 times [2019-09-03 20:09:26,183 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:26,183 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:26,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:09:26,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:26,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:26,299 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:09:26,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-03 20:09:26,301 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-03 20:09:26,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-03 20:09:26,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 20:09:26,302 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 3 states. [2019-09-03 20:09:26,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:26,345 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2019-09-03 20:09:26,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-03 20:09:26,346 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-09-03 20:09:26,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:26,347 INFO L225 Difference]: With dead ends: 48 [2019-09-03 20:09:26,347 INFO L226 Difference]: Without dead ends: 31 [2019-09-03 20:09:26,348 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 20:09:26,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-03 20:09:26,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2019-09-03 20:09:26,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-03 20:09:26,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-09-03 20:09:26,355 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 14 [2019-09-03 20:09:26,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:26,356 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-09-03 20:09:26,356 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-03 20:09:26,356 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-09-03 20:09:26,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-03 20:09:26,357 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:26,357 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:26,357 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:26,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:26,358 INFO L82 PathProgramCache]: Analyzing trace with hash 374245081, now seen corresponding path program 1 times [2019-09-03 20:09:26,358 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:26,358 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:26,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:09:26,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:26,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:26,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:26,447 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:26,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:09:26,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:26,494 INFO L256 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-03 20:09:26,500 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:26,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (2)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:09:26,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:26,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-09-03 20:09:26,567 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 20:09:26,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 20:09:26,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-03 20:09:26,568 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 5 states. [2019-09-03 20:09:26,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:26,621 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2019-09-03 20:09:26,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-03 20:09:26,622 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2019-09-03 20:09:26,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:26,623 INFO L225 Difference]: With dead ends: 51 [2019-09-03 20:09:26,623 INFO L226 Difference]: Without dead ends: 33 [2019-09-03 20:09:26,624 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-03 20:09:26,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-09-03 20:09:26,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 25. [2019-09-03 20:09:26,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-09-03 20:09:26,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-09-03 20:09:26,631 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 16 [2019-09-03 20:09:26,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:26,631 INFO L475 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-09-03 20:09:26,631 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 20:09:26,631 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-09-03 20:09:26,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-03 20:09:26,632 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:26,633 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:26,633 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:26,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:26,633 INFO L82 PathProgramCache]: Analyzing trace with hash -465210473, now seen corresponding path program 2 times [2019-09-03 20:09:26,634 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:26,634 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:26,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:09:26,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:26,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:26,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:26,750 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:26,763 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 20:09:26,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 20:09:26,783 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:26,783 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-03 20:09:26,785 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:26,814 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:26,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:26,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-09-03 20:09:26,818 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-03 20:09:26,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-03 20:09:26,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-09-03 20:09:26,819 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 6 states. [2019-09-03 20:09:26,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:26,870 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2019-09-03 20:09:26,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 20:09:26,872 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2019-09-03 20:09:26,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:26,873 INFO L225 Difference]: With dead ends: 55 [2019-09-03 20:09:26,873 INFO L226 Difference]: Without dead ends: 35 [2019-09-03 20:09:26,874 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-09-03 20:09:26,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-09-03 20:09:26,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2019-09-03 20:09:26,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-03 20:09:26,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-09-03 20:09:26,879 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 18 [2019-09-03 20:09:26,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:26,880 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-09-03 20:09:26,880 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-03 20:09:26,880 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-09-03 20:09:26,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-09-03 20:09:26,881 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:26,881 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:26,882 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:26,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:26,882 INFO L82 PathProgramCache]: Analyzing trace with hash 271853781, now seen corresponding path program 3 times [2019-09-03 20:09:26,882 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:26,882 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:26,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:26,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:26,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:26,986 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:26,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:26,987 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:27,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:27,035 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-03 20:09:27,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:27,037 INFO L256 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-03 20:09:27,038 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:27,063 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:27,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:27,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-09-03 20:09:27,068 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-03 20:09:27,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-03 20:09:27,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-03 20:09:27,069 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 7 states. [2019-09-03 20:09:27,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:27,153 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2019-09-03 20:09:27,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 20:09:27,154 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2019-09-03 20:09:27,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:27,155 INFO L225 Difference]: With dead ends: 59 [2019-09-03 20:09:27,155 INFO L226 Difference]: Without dead ends: 37 [2019-09-03 20:09:27,155 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-03 20:09:27,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-03 20:09:27,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2019-09-03 20:09:27,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-03 20:09:27,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-09-03 20:09:27,161 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2019-09-03 20:09:27,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:27,161 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-09-03 20:09:27,161 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-03 20:09:27,161 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-09-03 20:09:27,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-03 20:09:27,162 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:27,162 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:27,163 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:27,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:27,163 INFO L82 PathProgramCache]: Analyzing trace with hash -79001965, now seen corresponding path program 4 times [2019-09-03 20:09:27,163 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:27,163 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:27,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:27,164 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:27,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:27,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:27,282 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:27,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:27,282 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:27,302 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:09:27,316 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:09:27,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:27,317 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-03 20:09:27,319 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:27,355 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:27,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:27,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-09-03 20:09:27,359 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-03 20:09:27,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-03 20:09:27,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-03 20:09:27,360 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 8 states. [2019-09-03 20:09:27,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:27,431 INFO L93 Difference]: Finished difference Result 63 states and 75 transitions. [2019-09-03 20:09:27,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 20:09:27,432 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2019-09-03 20:09:27,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:27,433 INFO L225 Difference]: With dead ends: 63 [2019-09-03 20:09:27,433 INFO L226 Difference]: Without dead ends: 39 [2019-09-03 20:09:27,433 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-03 20:09:27,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-09-03 20:09:27,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 31. [2019-09-03 20:09:27,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-09-03 20:09:27,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-09-03 20:09:27,438 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2019-09-03 20:09:27,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:27,439 INFO L475 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-09-03 20:09:27,439 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-03 20:09:27,439 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-09-03 20:09:27,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-09-03 20:09:27,440 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:27,440 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:27,440 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:27,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:27,440 INFO L82 PathProgramCache]: Analyzing trace with hash 2051042513, now seen corresponding path program 5 times [2019-09-03 20:09:27,441 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:27,441 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:27,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:27,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:27,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:27,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:27,557 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:27,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:27,558 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:27,579 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:29,450 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-09-03 20:09:29,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:29,452 INFO L256 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 20:09:29,453 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:29,483 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:29,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:29,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-09-03 20:09:29,489 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-03 20:09:29,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-03 20:09:29,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-09-03 20:09:29,490 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 9 states. [2019-09-03 20:09:29,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:29,593 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2019-09-03 20:09:29,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-03 20:09:29,596 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2019-09-03 20:09:29,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:29,597 INFO L225 Difference]: With dead ends: 67 [2019-09-03 20:09:29,597 INFO L226 Difference]: Without dead ends: 41 [2019-09-03 20:09:29,601 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-09-03 20:09:29,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-09-03 20:09:29,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2019-09-03 20:09:29,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-09-03 20:09:29,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2019-09-03 20:09:29,608 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2019-09-03 20:09:29,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:29,609 INFO L475 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2019-09-03 20:09:29,609 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-03 20:09:29,609 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2019-09-03 20:09:29,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-03 20:09:29,610 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:29,611 INFO L399 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:29,611 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:29,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:29,611 INFO L82 PathProgramCache]: Analyzing trace with hash 324385679, now seen corresponding path program 6 times [2019-09-03 20:09:29,611 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:29,611 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:29,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:29,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:29,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:29,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:29,740 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:29,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:29,741 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:29,768 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 20:09:29,797 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-09-03 20:09:29,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:29,798 INFO L256 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-03 20:09:29,800 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:29,833 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:29,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:29,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-09-03 20:09:29,837 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 20:09:29,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 20:09:29,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-09-03 20:09:29,838 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 10 states. [2019-09-03 20:09:29,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:29,943 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2019-09-03 20:09:29,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-03 20:09:29,944 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2019-09-03 20:09:29,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:29,945 INFO L225 Difference]: With dead ends: 71 [2019-09-03 20:09:29,946 INFO L226 Difference]: Without dead ends: 43 [2019-09-03 20:09:29,947 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-09-03 20:09:29,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-09-03 20:09:29,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2019-09-03 20:09:29,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-09-03 20:09:29,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2019-09-03 20:09:29,958 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2019-09-03 20:09:29,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:29,959 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2019-09-03 20:09:29,959 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 20:09:29,959 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2019-09-03 20:09:29,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-03 20:09:29,962 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:29,963 INFO L399 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:29,963 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:29,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:29,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1135455539, now seen corresponding path program 7 times [2019-09-03 20:09:29,964 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:29,964 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:29,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:29,965 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:29,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:29,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:30,143 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:30,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:30,143 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:30,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:30,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:30,188 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-03 20:09:30,190 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:30,253 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:30,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:30,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-09-03 20:09:30,259 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-03 20:09:30,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-03 20:09:30,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-09-03 20:09:30,260 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 11 states. [2019-09-03 20:09:30,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:30,384 INFO L93 Difference]: Finished difference Result 75 states and 87 transitions. [2019-09-03 20:09:30,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-03 20:09:30,384 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-09-03 20:09:30,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:30,385 INFO L225 Difference]: With dead ends: 75 [2019-09-03 20:09:30,385 INFO L226 Difference]: Without dead ends: 45 [2019-09-03 20:09:30,386 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-09-03 20:09:30,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-09-03 20:09:30,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 37. [2019-09-03 20:09:30,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-09-03 20:09:30,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2019-09-03 20:09:30,391 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2019-09-03 20:09:30,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:30,391 INFO L475 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2019-09-03 20:09:30,391 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-03 20:09:30,392 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2019-09-03 20:09:30,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-09-03 20:09:30,392 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:30,393 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:30,393 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:30,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:30,393 INFO L82 PathProgramCache]: Analyzing trace with hash 411439755, now seen corresponding path program 8 times [2019-09-03 20:09:30,393 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:30,394 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:30,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:30,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:09:30,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:30,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:30,581 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:30,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:30,581 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:30,604 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:30,624 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 20:09:30,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:30,625 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-03 20:09:30,627 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:30,660 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:30,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:30,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-09-03 20:09:30,665 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-03 20:09:30,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-03 20:09:30,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2019-09-03 20:09:30,665 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 12 states. [2019-09-03 20:09:30,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:30,801 INFO L93 Difference]: Finished difference Result 79 states and 91 transitions. [2019-09-03 20:09:30,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-03 20:09:30,802 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 30 [2019-09-03 20:09:30,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:30,803 INFO L225 Difference]: With dead ends: 79 [2019-09-03 20:09:30,803 INFO L226 Difference]: Without dead ends: 47 [2019-09-03 20:09:30,804 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2019-09-03 20:09:30,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-09-03 20:09:30,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2019-09-03 20:09:30,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-03 20:09:30,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2019-09-03 20:09:30,809 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2019-09-03 20:09:30,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:30,809 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2019-09-03 20:09:30,809 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-03 20:09:30,809 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2019-09-03 20:09:30,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-09-03 20:09:30,810 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:30,810 INFO L399 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:30,811 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:30,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:30,811 INFO L82 PathProgramCache]: Analyzing trace with hash 919132873, now seen corresponding path program 9 times [2019-09-03 20:09:30,811 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:30,811 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:30,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:30,812 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:30,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:30,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:30,982 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:30,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:30,983 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:30,998 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:43,087 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-09-03 20:09:43,088 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:43,088 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 21 conjunts are in the unsatisfiable core [2019-09-03 20:09:43,090 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:43,120 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:43,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:43,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-09-03 20:09:43,125 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-03 20:09:43,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-03 20:09:43,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-03 20:09:43,126 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 13 states. [2019-09-03 20:09:43,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:43,286 INFO L93 Difference]: Finished difference Result 83 states and 95 transitions. [2019-09-03 20:09:43,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-03 20:09:43,286 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 32 [2019-09-03 20:09:43,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:43,287 INFO L225 Difference]: With dead ends: 83 [2019-09-03 20:09:43,288 INFO L226 Difference]: Without dead ends: 49 [2019-09-03 20:09:43,288 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-03 20:09:43,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-03 20:09:43,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 41. [2019-09-03 20:09:43,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-09-03 20:09:43,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2019-09-03 20:09:43,294 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2019-09-03 20:09:43,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:43,294 INFO L475 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2019-09-03 20:09:43,294 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-03 20:09:43,294 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2019-09-03 20:09:43,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-03 20:09:43,296 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:43,296 INFO L399 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:43,296 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:43,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:43,296 INFO L82 PathProgramCache]: Analyzing trace with hash -814052473, now seen corresponding path program 10 times [2019-09-03 20:09:43,297 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:43,297 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:43,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:43,298 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:43,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:43,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:43,482 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:43,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:43,482 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:43,509 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:09:43,526 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:09:43,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:09:43,527 INFO L256 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-03 20:09:43,529 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:09:43,562 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:43,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:09:43,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2019-09-03 20:09:43,567 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-03 20:09:43,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-03 20:09:43,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2019-09-03 20:09:43,568 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 14 states. [2019-09-03 20:09:43,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:09:43,766 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2019-09-03 20:09:43,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-03 20:09:43,766 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 34 [2019-09-03 20:09:43,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:09:43,767 INFO L225 Difference]: With dead ends: 87 [2019-09-03 20:09:43,767 INFO L226 Difference]: Without dead ends: 51 [2019-09-03 20:09:43,768 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2019-09-03 20:09:43,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-09-03 20:09:43,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 43. [2019-09-03 20:09:43,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-09-03 20:09:43,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2019-09-03 20:09:43,773 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2019-09-03 20:09:43,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:09:43,773 INFO L475 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2019-09-03 20:09:43,773 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-03 20:09:43,773 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2019-09-03 20:09:43,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-09-03 20:09:43,774 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:09:43,774 INFO L399 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:09:43,774 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:09:43,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:09:43,775 INFO L82 PathProgramCache]: Analyzing trace with hash 42140869, now seen corresponding path program 11 times [2019-09-03 20:09:43,775 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:09:43,775 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:09:43,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:43,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:09:43,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:09:43,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:09:43,945 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:09:43,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:09:43,946 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:09:43,965 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:14,924 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-09-03 20:11:14,924 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:11:16,082 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 25 conjunts are in the unsatisfiable core [2019-09-03 20:11:16,083 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:11:16,137 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:16,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:11:16,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2019-09-03 20:11:16,143 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-03 20:11:16,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-03 20:11:16,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:11:16,144 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 15 states. [2019-09-03 20:11:16,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:11:16,343 INFO L93 Difference]: Finished difference Result 91 states and 103 transitions. [2019-09-03 20:11:16,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-03 20:11:16,344 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2019-09-03 20:11:16,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:11:16,344 INFO L225 Difference]: With dead ends: 91 [2019-09-03 20:11:16,345 INFO L226 Difference]: Without dead ends: 53 [2019-09-03 20:11:16,345 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:11:16,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-09-03 20:11:16,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 45. [2019-09-03 20:11:16,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-09-03 20:11:16,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2019-09-03 20:11:16,351 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2019-09-03 20:11:16,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:11:16,351 INFO L475 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2019-09-03 20:11:16,351 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-03 20:11:16,351 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2019-09-03 20:11:16,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-09-03 20:11:16,352 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:11:16,352 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:11:16,352 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:11:16,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:11:16,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1789778301, now seen corresponding path program 12 times [2019-09-03 20:11:16,353 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:11:16,353 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:11:16,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:16,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:11:16,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:16,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:16,584 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:16,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:11:16,584 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:16,600 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 20:11:19,044 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-09-03 20:11:19,045 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:11:19,048 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-03 20:11:19,050 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:11:19,093 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:19,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:11:19,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2019-09-03 20:11:19,098 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-03 20:11:19,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-03 20:11:19,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2019-09-03 20:11:19,099 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 16 states. [2019-09-03 20:11:19,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:11:19,382 INFO L93 Difference]: Finished difference Result 95 states and 107 transitions. [2019-09-03 20:11:19,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-03 20:11:19,383 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2019-09-03 20:11:19,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:11:19,384 INFO L225 Difference]: With dead ends: 95 [2019-09-03 20:11:19,384 INFO L226 Difference]: Without dead ends: 55 [2019-09-03 20:11:19,387 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2019-09-03 20:11:19,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-09-03 20:11:19,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2019-09-03 20:11:19,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-09-03 20:11:19,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2019-09-03 20:11:19,395 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 38 [2019-09-03 20:11:19,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:11:19,395 INFO L475 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2019-09-03 20:11:19,397 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-03 20:11:19,398 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2019-09-03 20:11:19,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-03 20:11:19,398 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:11:19,398 INFO L399 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:11:19,398 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:11:19,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:11:19,399 INFO L82 PathProgramCache]: Analyzing trace with hash -1327509311, now seen corresponding path program 13 times [2019-09-03 20:11:19,399 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:11:19,399 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:11:19,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:19,400 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:11:19,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:19,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:19,621 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:19,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:11:19,621 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:19,632 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:11:19,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:19,648 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 29 conjunts are in the unsatisfiable core [2019-09-03 20:11:19,650 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:11:19,681 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:19,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:11:19,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-09-03 20:11:19,685 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-03 20:11:19,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-03 20:11:19,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-09-03 20:11:19,686 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2019-09-03 20:11:19,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:11:19,979 INFO L93 Difference]: Finished difference Result 99 states and 111 transitions. [2019-09-03 20:11:19,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-03 20:11:19,979 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2019-09-03 20:11:19,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:11:19,980 INFO L225 Difference]: With dead ends: 99 [2019-09-03 20:11:19,980 INFO L226 Difference]: Without dead ends: 57 [2019-09-03 20:11:19,981 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-09-03 20:11:19,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-09-03 20:11:19,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 49. [2019-09-03 20:11:19,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-09-03 20:11:19,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2019-09-03 20:11:19,986 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 40 [2019-09-03 20:11:19,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:11:19,986 INFO L475 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2019-09-03 20:11:19,987 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-03 20:11:19,987 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2019-09-03 20:11:19,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-09-03 20:11:19,987 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:11:19,988 INFO L399 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:11:19,988 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:11:19,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:11:19,988 INFO L82 PathProgramCache]: Analyzing trace with hash 531358591, now seen corresponding path program 14 times [2019-09-03 20:11:19,989 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:11:19,989 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:11:19,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:19,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:11:19,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:19,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:20,270 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:20,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:11:20,271 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:20,292 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 20:11:20,309 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 20:11:20,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:11:20,310 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 31 conjunts are in the unsatisfiable core [2019-09-03 20:11:20,313 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:11:20,355 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:20,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:11:20,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2019-09-03 20:11:20,359 INFO L454 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-09-03 20:11:20,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-09-03 20:11:20,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2019-09-03 20:11:20,360 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 18 states. [2019-09-03 20:11:20,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:11:20,668 INFO L93 Difference]: Finished difference Result 103 states and 115 transitions. [2019-09-03 20:11:20,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-03 20:11:20,668 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 42 [2019-09-03 20:11:20,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:11:20,669 INFO L225 Difference]: With dead ends: 103 [2019-09-03 20:11:20,669 INFO L226 Difference]: Without dead ends: 59 [2019-09-03 20:11:20,670 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2019-09-03 20:11:20,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-09-03 20:11:20,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2019-09-03 20:11:20,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-09-03 20:11:20,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2019-09-03 20:11:20,675 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 42 [2019-09-03 20:11:20,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:11:20,675 INFO L475 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2019-09-03 20:11:20,675 INFO L476 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-09-03 20:11:20,675 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2019-09-03 20:11:20,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-09-03 20:11:20,676 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:11:20,676 INFO L399 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:11:20,676 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:11:20,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:11:20,677 INFO L82 PathProgramCache]: Analyzing trace with hash 197017277, now seen corresponding path program 15 times [2019-09-03 20:11:20,677 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:11:20,677 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:11:20,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:20,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:11:20,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:20,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:20,924 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:20,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:11:20,924 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:20,944 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:11:33,308 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-09-03 20:11:33,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:11:33,310 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 33 conjunts are in the unsatisfiable core [2019-09-03 20:11:33,311 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:11:33,354 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:33,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:11:33,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-09-03 20:11:33,360 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-03 20:11:33,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-03 20:11:33,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2019-09-03 20:11:33,361 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 19 states. [2019-09-03 20:11:33,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:11:33,708 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2019-09-03 20:11:33,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-03 20:11:33,712 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 44 [2019-09-03 20:11:33,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:11:33,713 INFO L225 Difference]: With dead ends: 107 [2019-09-03 20:11:33,713 INFO L226 Difference]: Without dead ends: 61 [2019-09-03 20:11:33,714 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2019-09-03 20:11:33,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-03 20:11:33,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2019-09-03 20:11:33,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-09-03 20:11:33,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2019-09-03 20:11:33,718 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 44 [2019-09-03 20:11:33,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:11:33,718 INFO L475 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2019-09-03 20:11:33,718 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-03 20:11:33,719 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2019-09-03 20:11:33,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-03 20:11:33,719 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:11:33,719 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:11:33,720 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:11:33,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:11:33,720 INFO L82 PathProgramCache]: Analyzing trace with hash 1017561723, now seen corresponding path program 16 times [2019-09-03 20:11:33,720 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:11:33,720 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:11:33,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:33,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:11:33,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:33,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:33,982 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:33,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:11:33,982 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:33,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:11:34,023 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:11:34,023 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:11:34,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 35 conjunts are in the unsatisfiable core [2019-09-03 20:11:34,026 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:11:34,065 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:34,068 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:11:34,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-09-03 20:11:34,068 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-03 20:11:34,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-03 20:11:34,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2019-09-03 20:11:34,069 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 20 states. [2019-09-03 20:11:34,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:11:34,510 INFO L93 Difference]: Finished difference Result 111 states and 123 transitions. [2019-09-03 20:11:34,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-03 20:11:34,511 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 46 [2019-09-03 20:11:34,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:11:34,511 INFO L225 Difference]: With dead ends: 111 [2019-09-03 20:11:34,511 INFO L226 Difference]: Without dead ends: 63 [2019-09-03 20:11:34,512 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2019-09-03 20:11:34,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-09-03 20:11:34,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2019-09-03 20:11:34,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-09-03 20:11:34,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2019-09-03 20:11:34,517 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 46 [2019-09-03 20:11:34,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:11:34,517 INFO L475 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2019-09-03 20:11:34,517 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-03 20:11:34,517 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2019-09-03 20:11:34,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-09-03 20:11:34,518 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:11:34,518 INFO L399 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:11:34,518 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:11:34,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:11:34,519 INFO L82 PathProgramCache]: Analyzing trace with hash -713208135, now seen corresponding path program 17 times [2019-09-03 20:11:34,519 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:11:34,519 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:11:34,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:34,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:11:34,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:11:34,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:11:34,777 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:11:34,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:11:34,777 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:11:34,788 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-03 20:14:23,318 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-09-03 20:14:23,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:14:23,839 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 37 conjunts are in the unsatisfiable core [2019-09-03 20:14:23,840 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:14:23,898 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:14:23,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:14:23,903 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-09-03 20:14:23,904 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-03 20:14:23,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-03 20:14:23,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2019-09-03 20:14:23,905 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand 21 states. [2019-09-03 20:14:24,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:14:24,323 INFO L93 Difference]: Finished difference Result 115 states and 127 transitions. [2019-09-03 20:14:24,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-03 20:14:24,324 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 48 [2019-09-03 20:14:24,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:14:24,325 INFO L225 Difference]: With dead ends: 115 [2019-09-03 20:14:24,325 INFO L226 Difference]: Without dead ends: 65 [2019-09-03 20:14:24,325 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2019-09-03 20:14:24,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-09-03 20:14:24,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 57. [2019-09-03 20:14:24,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-09-03 20:14:24,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2019-09-03 20:14:24,329 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 48 [2019-09-03 20:14:24,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:14:24,329 INFO L475 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2019-09-03 20:14:24,329 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-03 20:14:24,329 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2019-09-03 20:14:24,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-09-03 20:14:24,330 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:14:24,330 INFO L399 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:14:24,330 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:14:24,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:14:24,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1830698121, now seen corresponding path program 18 times [2019-09-03 20:14:24,331 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:14:24,331 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:14:24,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:14:24,332 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:14:24,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:14:24,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:14:24,633 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:14:24,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:14:24,633 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:14:24,644 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 20:16:45,848 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-09-03 20:16:45,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:16:46,695 INFO L256 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 39 conjunts are in the unsatisfiable core [2019-09-03 20:16:46,696 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:16:46,728 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:16:46,734 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:16:46,734 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2019-09-03 20:16:46,735 INFO L454 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-09-03 20:16:46,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-09-03 20:16:46,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2019-09-03 20:16:46,735 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 22 states. [2019-09-03 20:16:47,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:16:47,293 INFO L93 Difference]: Finished difference Result 119 states and 131 transitions. [2019-09-03 20:16:47,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-09-03 20:16:47,294 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 50 [2019-09-03 20:16:47,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:16:47,295 INFO L225 Difference]: With dead ends: 119 [2019-09-03 20:16:47,296 INFO L226 Difference]: Without dead ends: 67 [2019-09-03 20:16:47,296 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2019-09-03 20:16:47,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-09-03 20:16:47,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 59. [2019-09-03 20:16:47,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-03 20:16:47,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2019-09-03 20:16:47,300 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 50 [2019-09-03 20:16:47,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:16:47,301 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2019-09-03 20:16:47,301 INFO L476 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-09-03 20:16:47,301 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2019-09-03 20:16:47,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-09-03 20:16:47,302 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:16:47,302 INFO L399 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:16:47,302 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:16:47,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:16:47,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1996750667, now seen corresponding path program 19 times [2019-09-03 20:16:47,303 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:16:47,303 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:16:47,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:16:47,304 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:16:47,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:16:47,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:16:47,754 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:16:47,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:16:47,755 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:16:47,785 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:16:47,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:16:47,813 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 41 conjunts are in the unsatisfiable core [2019-09-03 20:16:47,815 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:16:47,888 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:16:47,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:16:47,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-09-03 20:16:47,894 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-03 20:16:47,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-03 20:16:47,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2019-09-03 20:16:47,895 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand 23 states. [2019-09-03 20:16:48,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:16:48,626 INFO L93 Difference]: Finished difference Result 123 states and 135 transitions. [2019-09-03 20:16:48,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-03 20:16:48,627 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 52 [2019-09-03 20:16:48,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:16:48,628 INFO L225 Difference]: With dead ends: 123 [2019-09-03 20:16:48,628 INFO L226 Difference]: Without dead ends: 69 [2019-09-03 20:16:48,629 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2019-09-03 20:16:48,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-09-03 20:16:48,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2019-09-03 20:16:48,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-09-03 20:16:48,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2019-09-03 20:16:48,636 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 52 [2019-09-03 20:16:48,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:16:48,639 INFO L475 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2019-09-03 20:16:48,639 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-03 20:16:48,639 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2019-09-03 20:16:48,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-09-03 20:16:48,644 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:16:48,644 INFO L399 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:16:48,644 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:16:48,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:16:48,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1635509875, now seen corresponding path program 20 times [2019-09-03 20:16:48,645 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:16:48,645 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:16:48,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:16:48,647 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:16:48,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:16:48,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:16:49,227 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:16:49,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:16:49,228 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:16:49,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 20:16:49,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 20:16:49,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:16:49,295 INFO L256 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 43 conjunts are in the unsatisfiable core [2019-09-03 20:16:49,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:16:49,340 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (21)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:16:49,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:16:49,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2019-09-03 20:16:49,349 INFO L454 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-09-03 20:16:49,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-09-03 20:16:49,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2019-09-03 20:16:49,350 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand 24 states. [2019-09-03 20:16:49,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:16:49,866 INFO L93 Difference]: Finished difference Result 127 states and 139 transitions. [2019-09-03 20:16:49,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-03 20:16:49,869 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 54 [2019-09-03 20:16:49,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:16:49,870 INFO L225 Difference]: With dead ends: 127 [2019-09-03 20:16:49,870 INFO L226 Difference]: Without dead ends: 71 [2019-09-03 20:16:49,870 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2019-09-03 20:16:49,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-09-03 20:16:49,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 63. [2019-09-03 20:16:49,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-09-03 20:16:49,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2019-09-03 20:16:49,874 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 54 [2019-09-03 20:16:49,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:16:49,874 INFO L475 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2019-09-03 20:16:49,874 INFO L476 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-09-03 20:16:49,874 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2019-09-03 20:16:49,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-09-03 20:16:49,875 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:16:49,875 INFO L399 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:16:49,875 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:16:49,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:16:49,875 INFO L82 PathProgramCache]: Analyzing trace with hash 429479089, now seen corresponding path program 21 times [2019-09-03 20:16:49,876 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:16:49,876 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:16:49,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:16:49,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:16:49,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:16:49,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:16:50,256 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:16:50,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:16:50,256 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:16:50,271 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:19:17,496 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-09-03 20:19:17,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:19:17,617 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 45 conjunts are in the unsatisfiable core [2019-09-03 20:19:17,618 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:19:17,683 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:19:17,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:19:17,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2019-09-03 20:19:17,693 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-03 20:19:17,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-03 20:19:17,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2019-09-03 20:19:17,694 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand 25 states. [2019-09-03 20:19:18,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:19:18,346 INFO L93 Difference]: Finished difference Result 131 states and 143 transitions. [2019-09-03 20:19:18,347 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-03 20:19:18,347 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 56 [2019-09-03 20:19:18,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:19:18,347 INFO L225 Difference]: With dead ends: 131 [2019-09-03 20:19:18,347 INFO L226 Difference]: Without dead ends: 73 [2019-09-03 20:19:18,348 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2019-09-03 20:19:18,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-09-03 20:19:18,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 65. [2019-09-03 20:19:18,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-09-03 20:19:18,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2019-09-03 20:19:18,351 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 56 [2019-09-03 20:19:18,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:19:18,351 INFO L475 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2019-09-03 20:19:18,351 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-03 20:19:18,351 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2019-09-03 20:19:18,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-03 20:19:18,352 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:19:18,352 INFO L399 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:19:18,352 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:19:18,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:19:18,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1075063663, now seen corresponding path program 22 times [2019-09-03 20:19:18,353 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:19:18,353 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:19:18,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:19:18,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:19:18,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:19:18,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:19:18,864 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:19:18,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:19:18,865 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:19:18,884 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:19:18,910 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:19:18,910 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:19:18,912 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 47 conjunts are in the unsatisfiable core [2019-09-03 20:19:18,913 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:19:18,974 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:19:18,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 20:19:18,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2019-09-03 20:19:18,988 INFO L454 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-09-03 20:19:18,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-09-03 20:19:18,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2019-09-03 20:19:18,994 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand 26 states. [2019-09-03 20:19:19,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:19:19,683 INFO L93 Difference]: Finished difference Result 135 states and 147 transitions. [2019-09-03 20:19:19,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-09-03 20:19:19,683 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 58 [2019-09-03 20:19:19,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:19:19,684 INFO L225 Difference]: With dead ends: 135 [2019-09-03 20:19:19,684 INFO L226 Difference]: Without dead ends: 75 [2019-09-03 20:19:19,685 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2019-09-03 20:19:19,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-09-03 20:19:19,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2019-09-03 20:19:19,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-09-03 20:19:19,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 71 transitions. [2019-09-03 20:19:19,689 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 71 transitions. Word has length 58 [2019-09-03 20:19:19,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:19:19,689 INFO L475 AbstractCegarLoop]: Abstraction has 67 states and 71 transitions. [2019-09-03 20:19:19,689 INFO L476 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-09-03 20:19:19,689 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 71 transitions. [2019-09-03 20:19:19,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-09-03 20:19:19,690 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:19:19,690 INFO L399 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:19:19,691 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:19:19,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:19:19,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1288418643, now seen corresponding path program 23 times [2019-09-03 20:19:19,691 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 20:19:19,691 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 20:19:19,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:19:19,692 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:19:19,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:19:19,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:19:20,100 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:19:20,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:19:20,100 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:19:20,117 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1