java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:15:37,178 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:15:37,180 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:15:37,192 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:15:37,193 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:15:37,194 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:15:37,195 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:15:37,197 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:15:37,199 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:15:37,200 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:15:37,201 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:15:37,202 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:15:37,202 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:15:37,203 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:15:37,204 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:15:37,205 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:15:37,206 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:15:37,207 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:15:37,209 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:15:37,211 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:15:37,212 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:15:37,213 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:15:37,214 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:15:37,215 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:15:37,217 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:15:37,225 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:15:37,226 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:15:37,227 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:15:37,228 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 23:15:37,247 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:15:37,247 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:15:37,249 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:15:37,250 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:15:37,250 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:15:37,250 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:15:37,250 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:15:37,251 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:15:37,251 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:15:37,251 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:15:37,251 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:15:37,251 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:15:37,251 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:15:37,252 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:15:37,252 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:15:37,252 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:15:37,252 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:15:37,253 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:15:37,253 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:15:37,253 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:15:37,253 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:15:37,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:15:37,254 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:15:37,254 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:15:37,255 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:15:37,255 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:15:37,255 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:15:37,255 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:15:37,255 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:15:37,527 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:15:37,548 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:15:37,552 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:15:37,554 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:15:37,555 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:15:37,555 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2019-10-14 23:15:37,632 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/45e3d1889/199eb06d6f3e4b599d0a4530137f3acd/FLAGe854e5db6 [2019-10-14 23:15:38,082 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:15:38,083 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2019-10-14 23:15:38,089 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/45e3d1889/199eb06d6f3e4b599d0a4530137f3acd/FLAGe854e5db6 [2019-10-14 23:15:38,458 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/45e3d1889/199eb06d6f3e4b599d0a4530137f3acd [2019-10-14 23:15:38,471 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:15:38,473 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:15:38,474 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:15:38,474 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:15:38,477 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:15:38,478 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,481 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e9b6656 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38, skipping insertion in model container [2019-10-14 23:15:38,481 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,489 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:15:38,508 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:15:38,684 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:15:38,688 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:15:38,704 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:15:38,719 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:15:38,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38 WrapperNode [2019-10-14 23:15:38,720 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:15:38,720 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:15:38,721 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:15:38,721 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:15:38,734 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,735 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,822 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,823 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,829 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,834 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,835 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... [2019-10-14 23:15:38,837 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:15:38,837 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:15:38,837 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:15:38,837 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:15:38,838 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:15:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:15:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:15:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:15:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:15:38,887 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:15:38,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-14 23:15:38,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:15:38,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 23:15:38,889 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:15:38,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:15:38,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:15:39,060 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:15:39,061 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-14 23:15:39,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:15:39 BoogieIcfgContainer [2019-10-14 23:15:39,063 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:15:39,064 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:15:39,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:15:39,068 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:15:39,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:15:38" (1/3) ... [2019-10-14 23:15:39,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32080e01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:15:39, skipping insertion in model container [2019-10-14 23:15:39,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:38" (2/3) ... [2019-10-14 23:15:39,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32080e01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:15:39, skipping insertion in model container [2019-10-14 23:15:39,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:15:39" (3/3) ... [2019-10-14 23:15:39,075 INFO L109 eAbstractionObserver]: Analyzing ICFG gr2006.i [2019-10-14 23:15:39,087 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:15:39,105 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:15:39,122 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:15:39,171 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:15:39,172 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:15:39,172 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:15:39,172 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:15:39,172 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:15:39,172 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:15:39,173 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:15:39,173 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:15:39,191 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-10-14 23:15:39,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-14 23:15:39,196 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:39,197 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:39,198 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:39,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:39,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1001202113, now seen corresponding path program 1 times [2019-10-14 23:15:39,210 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:39,210 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97576212] [2019-10-14 23:15:39,211 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,211 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,211 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:39,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:39,311 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97576212] [2019-10-14 23:15:39,312 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:39,312 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-14 23:15:39,312 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196430312] [2019-10-14 23:15:39,316 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-14 23:15:39,316 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:39,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-14 23:15:39,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-14 23:15:39,329 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-10-14 23:15:39,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:39,348 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-10-14 23:15:39,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-14 23:15:39,349 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-10-14 23:15:39,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:39,357 INFO L225 Difference]: With dead ends: 32 [2019-10-14 23:15:39,357 INFO L226 Difference]: Without dead ends: 13 [2019-10-14 23:15:39,361 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-14 23:15:39,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-10-14 23:15:39,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-10-14 23:15:39,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-10-14 23:15:39,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-10-14 23:15:39,390 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-10-14 23:15:39,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:39,390 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-10-14 23:15:39,390 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-14 23:15:39,391 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-10-14 23:15:39,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-14 23:15:39,392 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:39,392 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:39,392 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:39,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:39,393 INFO L82 PathProgramCache]: Analyzing trace with hash 563077882, now seen corresponding path program 1 times [2019-10-14 23:15:39,393 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:39,393 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567101969] [2019-10-14 23:15:39,394 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,394 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,394 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:39,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:39,449 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567101969] [2019-10-14 23:15:39,449 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:39,450 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:15:39,450 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683114340] [2019-10-14 23:15:39,451 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:39,452 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:39,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:39,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:39,453 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2019-10-14 23:15:39,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:39,488 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-10-14 23:15:39,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:39,490 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-10-14 23:15:39,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:39,491 INFO L225 Difference]: With dead ends: 22 [2019-10-14 23:15:39,491 INFO L226 Difference]: Without dead ends: 17 [2019-10-14 23:15:39,492 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:39,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-14 23:15:39,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-14 23:15:39,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-14 23:15:39,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-10-14 23:15:39,497 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-10-14 23:15:39,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:39,498 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-10-14 23:15:39,498 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:39,498 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-10-14 23:15:39,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-14 23:15:39,499 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:39,499 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:39,500 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:39,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:39,500 INFO L82 PathProgramCache]: Analyzing trace with hash 620336184, now seen corresponding path program 1 times [2019-10-14 23:15:39,501 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:39,501 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462956793] [2019-10-14 23:15:39,501 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,501 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,502 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:39,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:39,523 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462956793] [2019-10-14 23:15:39,524 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:39,524 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:15:39,524 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863705003] [2019-10-14 23:15:39,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:15:39,525 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:39,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:15:39,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:15:39,526 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-10-14 23:15:39,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:39,540 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-10-14 23:15:39,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:15:39,541 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-14 23:15:39,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:39,542 INFO L225 Difference]: With dead ends: 32 [2019-10-14 23:15:39,543 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 23:15:39,543 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:15:39,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 23:15:39,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-10-14 23:15:39,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-14 23:15:39,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-10-14 23:15:39,549 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2019-10-14 23:15:39,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:39,549 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-10-14 23:15:39,550 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:15:39,550 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-10-14 23:15:39,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 23:15:39,551 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:39,551 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:39,551 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:39,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:39,552 INFO L82 PathProgramCache]: Analyzing trace with hash -657196198, now seen corresponding path program 1 times [2019-10-14 23:15:39,552 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:39,553 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728862688] [2019-10-14 23:15:39,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,554 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:39,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,620 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:15:39,621 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728862688] [2019-10-14 23:15:39,621 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759898972] [2019-10-14 23:15:39,621 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:39,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:39,674 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 23:15:39,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:39,703 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:15:39,703 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:39,703 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2019-10-14 23:15:39,704 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880249873] [2019-10-14 23:15:39,704 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:39,705 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:39,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:39,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:39,705 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-10-14 23:15:39,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:39,730 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-10-14 23:15:39,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:39,731 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-14 23:15:39,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:39,732 INFO L225 Difference]: With dead ends: 35 [2019-10-14 23:15:39,732 INFO L226 Difference]: Without dead ends: 23 [2019-10-14 23:15:39,733 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:39,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-14 23:15:39,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-10-14 23:15:39,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 23:15:39,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-14 23:15:39,739 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 18 [2019-10-14 23:15:39,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:39,740 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-14 23:15:39,740 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:39,740 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-14 23:15:39,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 23:15:39,741 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:39,741 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:39,945 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:39,946 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:39,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:39,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1550672957, now seen corresponding path program 2 times [2019-10-14 23:15:39,947 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:39,948 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43347735] [2019-10-14 23:15:39,948 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,948 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:39,948 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:39,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:40,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:40,062 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 23:15:40,062 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43347735] [2019-10-14 23:15:40,063 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723979026] [2019-10-14 23:15:40,063 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:40,099 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:40,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:40,100 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:15:40,101 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:40,156 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:15:40,157 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:40,157 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2019-10-14 23:15:40,157 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183729337] [2019-10-14 23:15:40,158 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:15:40,158 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:40,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:15:40,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:15:40,161 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2019-10-14 23:15:40,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:40,399 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-10-14 23:15:40,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:15:40,401 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2019-10-14 23:15:40,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:40,402 INFO L225 Difference]: With dead ends: 54 [2019-10-14 23:15:40,402 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 23:15:40,405 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:15:40,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 23:15:40,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2019-10-14 23:15:40,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 23:15:40,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-10-14 23:15:40,422 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 21 [2019-10-14 23:15:40,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:40,422 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-10-14 23:15:40,422 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:15:40,422 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-10-14 23:15:40,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 23:15:40,425 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:40,426 INFO L380 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:40,632 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:40,633 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:40,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:40,633 INFO L82 PathProgramCache]: Analyzing trace with hash -497587749, now seen corresponding path program 3 times [2019-10-14 23:15:40,633 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:40,634 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060293436] [2019-10-14 23:15:40,634 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:40,634 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:40,634 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:40,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:40,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:40,737 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 23:15:40,737 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060293436] [2019-10-14 23:15:40,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821922215] [2019-10-14 23:15:40,738 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:40,775 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 23:15:40,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:40,776 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:15:40,778 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:40,846 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 23:15:40,847 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:40,847 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2019-10-14 23:15:40,848 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436228792] [2019-10-14 23:15:40,849 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:15:40,849 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:40,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:15:40,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:15:40,851 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 11 states. [2019-10-14 23:15:41,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:41,054 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2019-10-14 23:15:41,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 23:15:41,055 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2019-10-14 23:15:41,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:41,058 INFO L225 Difference]: With dead ends: 81 [2019-10-14 23:15:41,058 INFO L226 Difference]: Without dead ends: 76 [2019-10-14 23:15:41,058 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=245, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:15:41,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-14 23:15:41,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 43. [2019-10-14 23:15:41,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 23:15:41,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-10-14 23:15:41,069 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-10-14 23:15:41,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:41,069 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-10-14 23:15:41,069 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:15:41,069 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-10-14 23:15:41,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 23:15:41,070 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:41,071 INFO L380 BasicCegarLoop]: trace histogram [11, 10, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:41,275 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:41,275 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:41,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:41,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1927396762, now seen corresponding path program 4 times [2019-10-14 23:15:41,276 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:41,276 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519122567] [2019-10-14 23:15:41,276 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:41,277 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:41,277 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:41,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:41,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:41,462 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 81 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:41,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519122567] [2019-10-14 23:15:41,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079356624] [2019-10-14 23:15:41,462 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:41,502 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:41,502 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:41,504 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:15:41,506 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:41,574 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 80 proven. 15 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:41,574 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:41,575 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 6] total 20 [2019-10-14 23:15:41,575 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368764737] [2019-10-14 23:15:41,576 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 23:15:41,576 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:41,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 23:15:41,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:15:41,577 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2019-10-14 23:15:41,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:41,701 INFO L93 Difference]: Finished difference Result 77 states and 94 transitions. [2019-10-14 23:15:41,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:15:41,702 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-10-14 23:15:41,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:41,703 INFO L225 Difference]: With dead ends: 77 [2019-10-14 23:15:41,703 INFO L226 Difference]: Without dead ends: 47 [2019-10-14 23:15:41,704 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=535, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:15:41,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-14 23:15:41,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-10-14 23:15:41,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 23:15:41,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2019-10-14 23:15:41,712 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 42 [2019-10-14 23:15:41,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:41,713 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2019-10-14 23:15:41,713 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 23:15:41,713 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2019-10-14 23:15:41,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-14 23:15:41,714 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:41,715 INFO L380 BasicCegarLoop]: trace histogram [12, 11, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:41,918 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:41,919 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:41,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:41,920 INFO L82 PathProgramCache]: Analyzing trace with hash -778605187, now seen corresponding path program 5 times [2019-10-14 23:15:41,920 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:41,920 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024001228] [2019-10-14 23:15:41,920 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:41,920 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:41,921 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:41,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:42,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:42,143 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 84 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:42,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024001228] [2019-10-14 23:15:42,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091315206] [2019-10-14 23:15:42,144 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:42,190 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 23:15:42,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:42,191 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:15:42,193 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:42,282 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 102 proven. 26 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:42,282 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:42,282 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7] total 23 [2019-10-14 23:15:42,283 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041714310] [2019-10-14 23:15:42,283 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:15:42,283 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:42,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:15:42,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:15:42,289 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2019-10-14 23:15:42,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:42,487 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2019-10-14 23:15:42,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:15:42,488 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2019-10-14 23:15:42,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:42,489 INFO L225 Difference]: With dead ends: 80 [2019-10-14 23:15:42,489 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 23:15:42,490 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=238, Invalid=754, Unknown=0, NotChecked=0, Total=992 [2019-10-14 23:15:42,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 23:15:42,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-10-14 23:15:42,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 23:15:42,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2019-10-14 23:15:42,498 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 45 [2019-10-14 23:15:42,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:42,498 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2019-10-14 23:15:42,498 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:15:42,498 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2019-10-14 23:15:42,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 23:15:42,500 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:42,500 INFO L380 BasicCegarLoop]: trace histogram [13, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:42,704 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:42,705 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:42,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:42,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1253478074, now seen corresponding path program 6 times [2019-10-14 23:15:42,706 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:42,706 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081704589] [2019-10-14 23:15:42,707 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:42,707 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:42,708 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:42,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:42,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:42,950 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 87 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:42,950 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081704589] [2019-10-14 23:15:42,950 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832738927] [2019-10-14 23:15:42,951 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:42,996 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 23:15:42,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:42,998 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:15:43,000 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:43,104 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 124 proven. 40 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:43,105 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:43,105 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8] total 26 [2019-10-14 23:15:43,105 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570889637] [2019-10-14 23:15:43,106 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 23:15:43,106 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:43,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 23:15:43,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=510, Unknown=0, NotChecked=0, Total=650 [2019-10-14 23:15:43,107 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 26 states. [2019-10-14 23:15:43,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:43,308 INFO L93 Difference]: Finished difference Result 83 states and 100 transitions. [2019-10-14 23:15:43,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:15:43,309 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 48 [2019-10-14 23:15:43,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:43,310 INFO L225 Difference]: With dead ends: 83 [2019-10-14 23:15:43,310 INFO L226 Difference]: Without dead ends: 53 [2019-10-14 23:15:43,312 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=324, Invalid=1008, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 23:15:43,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-10-14 23:15:43,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-10-14 23:15:43,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 23:15:43,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-10-14 23:15:43,318 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 48 [2019-10-14 23:15:43,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:43,319 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-10-14 23:15:43,319 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 23:15:43,319 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-10-14 23:15:43,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 23:15:43,320 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:43,320 INFO L380 BasicCegarLoop]: trace histogram [14, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:43,524 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:43,524 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:43,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:43,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1481869405, now seen corresponding path program 7 times [2019-10-14 23:15:43,525 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:43,525 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790808581] [2019-10-14 23:15:43,525 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:43,525 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:43,525 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:43,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:43,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:43,762 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 90 proven. 183 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:43,762 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790808581] [2019-10-14 23:15:43,762 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693526331] [2019-10-14 23:15:43,762 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:43,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:43,813 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:15:43,816 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:43,942 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 146 proven. 57 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:43,942 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:43,942 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9] total 29 [2019-10-14 23:15:43,942 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918692897] [2019-10-14 23:15:43,943 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 23:15:43,943 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:43,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 23:15:43,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:15:43,944 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand 29 states. [2019-10-14 23:15:44,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:44,192 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2019-10-14 23:15:44,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 23:15:44,193 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 51 [2019-10-14 23:15:44,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:44,194 INFO L225 Difference]: With dead ends: 86 [2019-10-14 23:15:44,194 INFO L226 Difference]: Without dead ends: 56 [2019-10-14 23:15:44,196 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=425, Invalid=1297, Unknown=0, NotChecked=0, Total=1722 [2019-10-14 23:15:44,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-14 23:15:44,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-10-14 23:15:44,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 23:15:44,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2019-10-14 23:15:44,202 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 51 [2019-10-14 23:15:44,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:44,203 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2019-10-14 23:15:44,203 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 23:15:44,203 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2019-10-14 23:15:44,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-14 23:15:44,204 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:44,204 INFO L380 BasicCegarLoop]: trace histogram [15, 14, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:44,407 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:44,408 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:44,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:44,408 INFO L82 PathProgramCache]: Analyzing trace with hash -2035152934, now seen corresponding path program 8 times [2019-10-14 23:15:44,409 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:44,409 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917779400] [2019-10-14 23:15:44,409 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:44,410 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:44,410 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:44,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:44,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:44,488 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 168 proven. 77 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:44,488 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917779400] [2019-10-14 23:15:44,488 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617108657] [2019-10-14 23:15:44,489 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:44,530 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:44,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:44,531 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:15:44,533 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:44,542 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 168 proven. 77 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:44,542 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:44,543 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2019-10-14 23:15:44,543 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850275807] [2019-10-14 23:15:44,543 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:15:44,544 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:44,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:15:44,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:15:44,544 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 10 states. [2019-10-14 23:15:44,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:44,570 INFO L93 Difference]: Finished difference Result 89 states and 106 transitions. [2019-10-14 23:15:44,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:15:44,571 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2019-10-14 23:15:44,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:44,572 INFO L225 Difference]: With dead ends: 89 [2019-10-14 23:15:44,572 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 23:15:44,573 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:15:44,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 23:15:44,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-10-14 23:15:44,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 23:15:44,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2019-10-14 23:15:44,579 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 54 [2019-10-14 23:15:44,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:44,579 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2019-10-14 23:15:44,579 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:15:44,580 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2019-10-14 23:15:44,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 23:15:44,580 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:44,581 INFO L380 BasicCegarLoop]: trace histogram [16, 15, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:44,791 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:44,792 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:44,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:44,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1920468163, now seen corresponding path program 9 times [2019-10-14 23:15:44,794 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:44,794 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273923048] [2019-10-14 23:15:44,794 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:44,795 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:44,795 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:44,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:44,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:44,916 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 23:15:44,916 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273923048] [2019-10-14 23:15:44,916 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8354586] [2019-10-14 23:15:44,917 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:44,976 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-14 23:15:44,976 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:44,977 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:15:44,979 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:45,094 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 190 proven. 100 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:45,095 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:45,095 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2019-10-14 23:15:45,095 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852347172] [2019-10-14 23:15:45,096 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 23:15:45,096 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:45,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 23:15:45,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:15:45,097 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 21 states. [2019-10-14 23:15:45,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:45,537 INFO L93 Difference]: Finished difference Result 174 states and 221 transitions. [2019-10-14 23:15:45,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 23:15:45,537 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 57 [2019-10-14 23:15:45,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:45,539 INFO L225 Difference]: With dead ends: 174 [2019-10-14 23:15:45,539 INFO L226 Difference]: Without dead ends: 144 [2019-10-14 23:15:45,540 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=398, Invalid=1242, Unknown=0, NotChecked=0, Total=1640 [2019-10-14 23:15:45,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-10-14 23:15:45,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 76. [2019-10-14 23:15:45,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 23:15:45,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2019-10-14 23:15:45,550 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 57 [2019-10-14 23:15:45,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:45,550 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2019-10-14 23:15:45,551 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 23:15:45,551 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2019-10-14 23:15:45,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 23:15:45,552 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:45,552 INFO L380 BasicCegarLoop]: trace histogram [18, 17, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:45,764 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:45,765 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:45,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:45,766 INFO L82 PathProgramCache]: Analyzing trace with hash -588505765, now seen corresponding path program 10 times [2019-10-14 23:15:45,766 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:45,766 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770567161] [2019-10-14 23:15:45,767 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:45,767 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:45,767 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:45,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:45,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 333 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-10-14 23:15:45,904 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770567161] [2019-10-14 23:15:45,904 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490682129] [2019-10-14 23:15:45,904 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:45,945 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:45,946 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:45,946 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:15:45,955 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:46,077 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 241 proven. 126 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2019-10-14 23:15:46,078 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:46,078 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2019-10-14 23:15:46,078 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142501727] [2019-10-14 23:15:46,078 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:15:46,078 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:46,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:15:46,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:15:46,079 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand 23 states. [2019-10-14 23:15:46,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:46,557 INFO L93 Difference]: Finished difference Result 220 states and 282 transitions. [2019-10-14 23:15:46,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-14 23:15:46,557 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 63 [2019-10-14 23:15:46,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:46,559 INFO L225 Difference]: With dead ends: 220 [2019-10-14 23:15:46,559 INFO L226 Difference]: Without dead ends: 175 [2019-10-14 23:15:46,560 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=476, Invalid=1504, Unknown=0, NotChecked=0, Total=1980 [2019-10-14 23:15:46,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2019-10-14 23:15:46,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 82. [2019-10-14 23:15:46,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 23:15:46,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2019-10-14 23:15:46,569 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 63 [2019-10-14 23:15:46,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:46,570 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2019-10-14 23:15:46,570 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:15:46,570 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2019-10-14 23:15:46,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-14 23:15:46,571 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:46,571 INFO L380 BasicCegarLoop]: trace histogram [20, 19, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:46,775 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:46,775 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:46,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:46,776 INFO L82 PathProgramCache]: Analyzing trace with hash -346376131, now seen corresponding path program 11 times [2019-10-14 23:15:46,776 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:46,776 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250623696] [2019-10-14 23:15:46,778 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:46,778 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:46,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:46,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:46,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:46,934 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 415 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-10-14 23:15:46,934 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250623696] [2019-10-14 23:15:46,934 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463900512] [2019-10-14 23:15:46,935 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:46,989 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2019-10-14 23:15:46,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:46,990 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:15:46,992 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:47,141 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 298 proven. 155 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-10-14 23:15:47,141 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:47,141 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2019-10-14 23:15:47,141 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562274362] [2019-10-14 23:15:47,142 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 23:15:47,142 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:47,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 23:15:47,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2019-10-14 23:15:47,143 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand 25 states. [2019-10-14 23:15:47,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:47,669 INFO L93 Difference]: Finished difference Result 242 states and 311 transitions. [2019-10-14 23:15:47,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-14 23:15:47,670 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2019-10-14 23:15:47,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:47,671 INFO L225 Difference]: With dead ends: 242 [2019-10-14 23:15:47,671 INFO L226 Difference]: Without dead ends: 194 [2019-10-14 23:15:47,673 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=561, Invalid=1791, Unknown=0, NotChecked=0, Total=2352 [2019-10-14 23:15:47,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-10-14 23:15:47,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 88. [2019-10-14 23:15:47,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-14 23:15:47,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 103 transitions. [2019-10-14 23:15:47,686 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 103 transitions. Word has length 69 [2019-10-14 23:15:47,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:47,687 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 103 transitions. [2019-10-14 23:15:47,687 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 23:15:47,687 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 103 transitions. [2019-10-14 23:15:47,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 23:15:47,701 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:47,701 INFO L380 BasicCegarLoop]: trace histogram [22, 21, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:47,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:47,902 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:47,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:47,902 INFO L82 PathProgramCache]: Analyzing trace with hash 2024448987, now seen corresponding path program 12 times [2019-10-14 23:15:47,903 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:47,903 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063079873] [2019-10-14 23:15:47,903 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:47,904 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:47,904 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:47,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:48,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:48,060 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-10-14 23:15:48,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063079873] [2019-10-14 23:15:48,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019051411] [2019-10-14 23:15:48,061 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:48,125 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2019-10-14 23:15:48,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:48,126 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:15:48,128 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:48,316 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 361 proven. 187 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2019-10-14 23:15:48,317 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:48,317 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 27 [2019-10-14 23:15:48,317 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824283301] [2019-10-14 23:15:48,318 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 23:15:48,318 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:48,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 23:15:48,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:15:48,319 INFO L87 Difference]: Start difference. First operand 88 states and 103 transitions. Second operand 27 states. [2019-10-14 23:15:48,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:48,929 INFO L93 Difference]: Finished difference Result 264 states and 340 transitions. [2019-10-14 23:15:48,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-10-14 23:15:48,933 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 75 [2019-10-14 23:15:48,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:48,935 INFO L225 Difference]: With dead ends: 264 [2019-10-14 23:15:48,935 INFO L226 Difference]: Without dead ends: 213 [2019-10-14 23:15:48,937 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=653, Invalid=2103, Unknown=0, NotChecked=0, Total=2756 [2019-10-14 23:15:48,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2019-10-14 23:15:48,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 94. [2019-10-14 23:15:48,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-10-14 23:15:48,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 110 transitions. [2019-10-14 23:15:48,944 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 110 transitions. Word has length 75 [2019-10-14 23:15:48,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:48,945 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 110 transitions. [2019-10-14 23:15:48,945 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 23:15:48,945 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 110 transitions. [2019-10-14 23:15:48,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-10-14 23:15:48,946 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:48,946 INFO L380 BasicCegarLoop]: trace histogram [24, 23, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:49,150 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:49,150 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:49,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:49,151 INFO L82 PathProgramCache]: Analyzing trace with hash 275670333, now seen corresponding path program 13 times [2019-10-14 23:15:49,151 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:49,152 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095736152] [2019-10-14 23:15:49,152 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:49,152 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:49,152 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:49,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:49,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:49,306 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 606 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-10-14 23:15:49,306 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095736152] [2019-10-14 23:15:49,306 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652498673] [2019-10-14 23:15:49,307 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:49,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:49,371 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 23:15:49,374 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:49,949 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 430 proven. 222 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2019-10-14 23:15:49,949 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:49,950 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2019-10-14 23:15:49,950 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100071763] [2019-10-14 23:15:49,951 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 23:15:49,952 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:49,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 23:15:49,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=612, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:15:49,958 INFO L87 Difference]: Start difference. First operand 94 states and 110 transitions. Second operand 29 states. [2019-10-14 23:15:50,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:50,658 INFO L93 Difference]: Finished difference Result 286 states and 369 transitions. [2019-10-14 23:15:50,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-10-14 23:15:50,659 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 81 [2019-10-14 23:15:50,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:50,660 INFO L225 Difference]: With dead ends: 286 [2019-10-14 23:15:50,661 INFO L226 Difference]: Without dead ends: 232 [2019-10-14 23:15:50,662 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=752, Invalid=2440, Unknown=0, NotChecked=0, Total=3192 [2019-10-14 23:15:50,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2019-10-14 23:15:50,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 100. [2019-10-14 23:15:50,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-10-14 23:15:50,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 117 transitions. [2019-10-14 23:15:50,670 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 117 transitions. Word has length 81 [2019-10-14 23:15:50,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:50,670 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 117 transitions. [2019-10-14 23:15:50,670 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 23:15:50,671 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 117 transitions. [2019-10-14 23:15:50,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-14 23:15:50,672 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:50,672 INFO L380 BasicCegarLoop]: trace histogram [26, 25, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:50,883 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:50,884 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:50,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:50,884 INFO L82 PathProgramCache]: Analyzing trace with hash 910752347, now seen corresponding path program 14 times [2019-10-14 23:15:50,885 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:50,885 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525532368] [2019-10-14 23:15:50,885 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:50,885 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:50,886 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:50,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:51,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:51,043 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-10-14 23:15:51,043 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525532368] [2019-10-14 23:15:51,043 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668168223] [2019-10-14 23:15:51,043 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:51,102 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:51,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:51,103 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 23:15:51,104 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:51,335 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 505 proven. 260 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 23:15:51,336 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:51,336 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 31 [2019-10-14 23:15:51,337 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800188113] [2019-10-14 23:15:51,337 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 23:15:51,338 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:51,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 23:15:51,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=701, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:15:51,339 INFO L87 Difference]: Start difference. First operand 100 states and 117 transitions. Second operand 31 states. [2019-10-14 23:15:52,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:52,022 INFO L93 Difference]: Finished difference Result 308 states and 398 transitions. [2019-10-14 23:15:52,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-10-14 23:15:52,023 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2019-10-14 23:15:52,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:52,025 INFO L225 Difference]: With dead ends: 308 [2019-10-14 23:15:52,025 INFO L226 Difference]: Without dead ends: 251 [2019-10-14 23:15:52,027 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=858, Invalid=2802, Unknown=0, NotChecked=0, Total=3660 [2019-10-14 23:15:52,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-10-14 23:15:52,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 106. [2019-10-14 23:15:52,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-10-14 23:15:52,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2019-10-14 23:15:52,035 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 87 [2019-10-14 23:15:52,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:52,035 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2019-10-14 23:15:52,035 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 23:15:52,035 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2019-10-14 23:15:52,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-14 23:15:52,036 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:52,037 INFO L380 BasicCegarLoop]: trace histogram [28, 27, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:52,241 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:52,241 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:52,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:52,242 INFO L82 PathProgramCache]: Analyzing trace with hash 96928317, now seen corresponding path program 15 times [2019-10-14 23:15:52,242 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:52,242 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115414064] [2019-10-14 23:15:52,242 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:52,242 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:52,243 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:52,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:52,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:52,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 833 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-10-14 23:15:52,447 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115414064] [2019-10-14 23:15:52,448 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846975237] [2019-10-14 23:15:52,448 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:52,531 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-10-14 23:15:52,531 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:52,532 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 23:15:52,533 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:52,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 561 proven. 534 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2019-10-14 23:15:52,838 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:52,838 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 33 [2019-10-14 23:15:52,839 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178045555] [2019-10-14 23:15:52,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 23:15:52,839 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:52,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 23:15:52,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 23:15:52,840 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand 33 states. [2019-10-14 23:15:53,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:53,713 INFO L93 Difference]: Finished difference Result 435 states and 577 transitions. [2019-10-14 23:15:53,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-10-14 23:15:53,715 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 93 [2019-10-14 23:15:53,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:53,717 INFO L225 Difference]: With dead ends: 435 [2019-10-14 23:15:53,717 INFO L226 Difference]: Without dead ends: 430 [2019-10-14 23:15:53,719 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1235, Invalid=2797, Unknown=0, NotChecked=0, Total=4032 [2019-10-14 23:15:53,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2019-10-14 23:15:53,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 142. [2019-10-14 23:15:53,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-10-14 23:15:53,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 172 transitions. [2019-10-14 23:15:53,729 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 172 transitions. Word has length 93 [2019-10-14 23:15:53,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:53,729 INFO L462 AbstractCegarLoop]: Abstraction has 142 states and 172 transitions. [2019-10-14 23:15:53,730 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 23:15:53,730 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 172 transitions. [2019-10-14 23:15:53,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-10-14 23:15:53,731 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:53,732 INFO L380 BasicCegarLoop]: trace histogram [44, 43, 30, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:53,937 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:53,937 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:53,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:53,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1146565437, now seen corresponding path program 16 times [2019-10-14 23:15:53,938 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:53,938 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291431526] [2019-10-14 23:15:53,938 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:53,939 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:53,939 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:53,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:55,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:55,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1291 proven. 1547 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:55,121 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291431526] [2019-10-14 23:15:55,122 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588655002] [2019-10-14 23:15:55,122 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:55,207 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:55,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:55,209 INFO L256 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 44 conjunts are in the unsatisfiable core [2019-10-14 23:15:55,212 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:56,885 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 170 proven. 2667 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:15:56,885 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:56,885 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 45] total 103 [2019-10-14 23:15:56,885 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560353443] [2019-10-14 23:15:56,886 INFO L442 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-10-14 23:15:56,886 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:56,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-10-14 23:15:56,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1918, Invalid=8588, Unknown=0, NotChecked=0, Total=10506 [2019-10-14 23:15:56,889 INFO L87 Difference]: Start difference. First operand 142 states and 172 transitions. Second operand 103 states. [2019-10-14 23:15:57,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:57,789 INFO L93 Difference]: Finished difference Result 326 states and 415 transitions. [2019-10-14 23:15:57,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-10-14 23:15:57,790 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 141 [2019-10-14 23:15:57,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:57,792 INFO L225 Difference]: With dead ends: 326 [2019-10-14 23:15:57,792 INFO L226 Difference]: Without dead ends: 230 [2019-10-14 23:15:57,798 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4438 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3868, Invalid=13424, Unknown=0, NotChecked=0, Total=17292 [2019-10-14 23:15:57,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-10-14 23:15:57,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-10-14 23:15:57,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-10-14 23:15:57,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 259 transitions. [2019-10-14 23:15:57,810 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 259 transitions. Word has length 141 [2019-10-14 23:15:57,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:57,810 INFO L462 AbstractCegarLoop]: Abstraction has 229 states and 259 transitions. [2019-10-14 23:15:57,810 INFO L463 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-10-14 23:15:57,811 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 259 transitions. [2019-10-14 23:15:57,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-10-14 23:15:57,813 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:57,813 INFO L380 BasicCegarLoop]: trace histogram [73, 72, 43, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:58,022 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:58,022 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:58,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:58,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1877929926, now seen corresponding path program 17 times [2019-10-14 23:15:58,023 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:58,024 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915941605] [2019-10-14 23:15:58,024 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:58,024 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:58,024 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:58,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:58,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:58,624 INFO L134 CoverageAnalysis]: Checked inductivity of 7884 backedges. 0 proven. 5089 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2019-10-14 23:15:58,624 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915941605] [2019-10-14 23:15:58,624 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866484417] [2019-10-14 23:15:58,624 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:58,788 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 73 check-sat command(s) [2019-10-14 23:15:58,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:58,790 INFO L256 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 45 conjunts are in the unsatisfiable core [2019-10-14 23:15:58,793 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:00,152 INFO L134 CoverageAnalysis]: Checked inductivity of 7884 backedges. 3842 proven. 2795 refuted. 0 times theorem prover too weak. 1247 trivial. 0 not checked. [2019-10-14 23:16:00,153 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:00,153 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 46] total 78 [2019-10-14 23:16:00,153 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183462447] [2019-10-14 23:16:00,154 INFO L442 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-10-14 23:16:00,154 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:00,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-10-14 23:16:00,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1535, Invalid=4471, Unknown=0, NotChecked=0, Total=6006 [2019-10-14 23:16:00,155 INFO L87 Difference]: Start difference. First operand 229 states and 259 transitions. Second operand 78 states. [2019-10-14 23:16:03,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:03,987 INFO L93 Difference]: Finished difference Result 1115 states and 1448 transitions. [2019-10-14 23:16:03,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2019-10-14 23:16:03,988 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 228 [2019-10-14 23:16:03,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:03,993 INFO L225 Difference]: With dead ends: 1115 [2019-10-14 23:16:03,993 INFO L226 Difference]: Without dead ends: 1019 [2019-10-14 23:16:03,997 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6257 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6773, Invalid=21283, Unknown=0, NotChecked=0, Total=28056 [2019-10-14 23:16:03,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2019-10-14 23:16:04,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 280. [2019-10-14 23:16:04,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-10-14 23:16:04,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 326 transitions. [2019-10-14 23:16:04,026 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 326 transitions. Word has length 228 [2019-10-14 23:16:04,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:04,026 INFO L462 AbstractCegarLoop]: Abstraction has 280 states and 326 transitions. [2019-10-14 23:16:04,026 INFO L463 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-10-14 23:16:04,026 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 326 transitions. [2019-10-14 23:16:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-10-14 23:16:04,029 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:04,030 INFO L380 BasicCegarLoop]: trace histogram [75, 74, 44, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:04,234 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:04,235 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:04,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:04,236 INFO L82 PathProgramCache]: Analyzing trace with hash 387565848, now seen corresponding path program 18 times [2019-10-14 23:16:04,236 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:04,236 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326673503] [2019-10-14 23:16:04,236 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:04,237 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:04,237 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:04,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:04,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:04,986 INFO L134 CoverageAnalysis]: Checked inductivity of 8325 backedges. 0 proven. 5399 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2019-10-14 23:16:04,987 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326673503] [2019-10-14 23:16:04,987 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552230060] [2019-10-14 23:16:04,987 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:05,159 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2019-10-14 23:16:05,160 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:05,162 INFO L256 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 46 conjunts are in the unsatisfiable core [2019-10-14 23:16:05,166 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 8325 backedges. 4064 proven. 2926 refuted. 0 times theorem prover too weak. 1335 trivial. 0 not checked. [2019-10-14 23:16:06,552 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:06,552 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 47] total 80 [2019-10-14 23:16:06,552 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133628033] [2019-10-14 23:16:06,553 INFO L442 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-10-14 23:16:06,553 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:06,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-10-14 23:16:06,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1613, Invalid=4707, Unknown=0, NotChecked=0, Total=6320 [2019-10-14 23:16:06,554 INFO L87 Difference]: Start difference. First operand 280 states and 326 transitions. Second operand 80 states. [2019-10-14 23:16:10,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:10,458 INFO L93 Difference]: Finished difference Result 1260 states and 1641 transitions. [2019-10-14 23:16:10,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2019-10-14 23:16:10,458 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 234 [2019-10-14 23:16:10,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:10,464 INFO L225 Difference]: With dead ends: 1260 [2019-10-14 23:16:10,464 INFO L226 Difference]: Without dead ends: 1116 [2019-10-14 23:16:10,466 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6557 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=7083, Invalid=22329, Unknown=0, NotChecked=0, Total=29412 [2019-10-14 23:16:10,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2019-10-14 23:16:10,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 286. [2019-10-14 23:16:10,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-10-14 23:16:10,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 333 transitions. [2019-10-14 23:16:10,494 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 333 transitions. Word has length 234 [2019-10-14 23:16:10,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:10,494 INFO L462 AbstractCegarLoop]: Abstraction has 286 states and 333 transitions. [2019-10-14 23:16:10,494 INFO L463 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-10-14 23:16:10,494 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 333 transitions. [2019-10-14 23:16:10,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-10-14 23:16:10,497 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:10,497 INFO L380 BasicCegarLoop]: trace histogram [77, 76, 45, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:10,702 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:10,702 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:10,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:10,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1058539962, now seen corresponding path program 19 times [2019-10-14 23:16:10,703 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:10,704 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429445329] [2019-10-14 23:16:10,704 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:10,704 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:10,705 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:10,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,629 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 0 proven. 5718 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2019-10-14 23:16:11,629 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429445329] [2019-10-14 23:16:11,630 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884777734] [2019-10-14 23:16:11,630 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:11,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,772 INFO L256 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 47 conjunts are in the unsatisfiable core [2019-10-14 23:16:11,778 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:13,258 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 4292 proven. 3060 refuted. 0 times theorem prover too weak. 1426 trivial. 0 not checked. [2019-10-14 23:16:13,258 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:13,259 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 48] total 82 [2019-10-14 23:16:13,259 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241771169] [2019-10-14 23:16:13,259 INFO L442 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-10-14 23:16:13,259 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:13,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-10-14 23:16:13,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1693, Invalid=4949, Unknown=0, NotChecked=0, Total=6642 [2019-10-14 23:16:13,261 INFO L87 Difference]: Start difference. First operand 286 states and 333 transitions. Second operand 82 states. [2019-10-14 23:16:17,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:17,255 INFO L93 Difference]: Finished difference Result 1315 states and 1714 transitions. [2019-10-14 23:16:17,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2019-10-14 23:16:17,256 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 240 [2019-10-14 23:16:17,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:17,261 INFO L225 Difference]: With dead ends: 1315 [2019-10-14 23:16:17,261 INFO L226 Difference]: Without dead ends: 1168 [2019-10-14 23:16:17,265 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6864 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7400, Invalid=23400, Unknown=0, NotChecked=0, Total=30800 [2019-10-14 23:16:17,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1168 states. [2019-10-14 23:16:17,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1168 to 292. [2019-10-14 23:16:17,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-10-14 23:16:17,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 340 transitions. [2019-10-14 23:16:17,293 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 340 transitions. Word has length 240 [2019-10-14 23:16:17,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:17,294 INFO L462 AbstractCegarLoop]: Abstraction has 292 states and 340 transitions. [2019-10-14 23:16:17,294 INFO L463 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-10-14 23:16:17,294 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 340 transitions. [2019-10-14 23:16:17,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-10-14 23:16:17,297 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:17,297 INFO L380 BasicCegarLoop]: trace histogram [79, 78, 46, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:17,501 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:17,502 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:17,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:17,502 INFO L82 PathProgramCache]: Analyzing trace with hash -2101031912, now seen corresponding path program 20 times [2019-10-14 23:16:17,502 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:17,502 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262892035] [2019-10-14 23:16:17,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:17,503 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:17,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:17,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:18,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:18,287 INFO L134 CoverageAnalysis]: Checked inductivity of 9243 backedges. 0 proven. 6046 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2019-10-14 23:16:18,287 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262892035] [2019-10-14 23:16:18,287 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578901686] [2019-10-14 23:16:18,288 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:18,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:16:18,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:18,436 INFO L256 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 48 conjunts are in the unsatisfiable core [2019-10-14 23:16:18,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:19,919 INFO L134 CoverageAnalysis]: Checked inductivity of 9243 backedges. 4526 proven. 3197 refuted. 0 times theorem prover too weak. 1520 trivial. 0 not checked. [2019-10-14 23:16:19,919 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:19,919 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 49] total 84 [2019-10-14 23:16:19,920 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445568180] [2019-10-14 23:16:19,920 INFO L442 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-10-14 23:16:19,920 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:19,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-10-14 23:16:19,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=5197, Unknown=0, NotChecked=0, Total=6972 [2019-10-14 23:16:19,921 INFO L87 Difference]: Start difference. First operand 292 states and 340 transitions. Second operand 84 states.