/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_copy1_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 20:20:34,145 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 20:20:34,148 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 20:20:34,168 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 20:20:34,168 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 20:20:34,170 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 20:20:34,172 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 20:20:34,181 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 20:20:34,185 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 20:20:34,188 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 20:20:34,190 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 20:20:34,192 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 20:20:34,192 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 20:20:34,194 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 20:20:34,196 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 20:20:34,197 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 20:20:34,199 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 20:20:34,200 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 20:20:34,201 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 20:20:34,206 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 20:20:34,210 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 20:20:34,214 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 20:20:34,215 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 20:20:34,216 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 20:20:34,218 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 20:20:34,228 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 20:20:34,229 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 20:20:34,230 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 20:20:34,231 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 [2019-11-23 20:20:34,256 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 20:20:34,256 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 20:20:34,257 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 20:20:34,258 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 20:20:34,258 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 20:20:34,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 20:20:34,258 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 20:20:34,258 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 20:20:34,259 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 20:20:34,259 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 20:20:34,259 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 20:20:34,259 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 20:20:34,259 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 20:20:34,260 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 20:20:34,260 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 20:20:34,260 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 20:20:34,260 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 20:20:34,260 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 20:20:34,261 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 20:20:34,261 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 20:20:34,261 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 20:20:34,261 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 20:20:34,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 20:20:34,262 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 20:20:34,262 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 20:20:34,262 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 20:20:34,262 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 20:20:34,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 20:20:34,262 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 20:20:34,263 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 20:20:34,531 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 20:20:34,543 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 20:20:34,547 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 20:20:34,548 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 20:20:34,549 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 20:20:34,549 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy1_ground-1.i [2019-11-23 20:20:34,617 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2fda09a5/3c5e836559db4266b8ae608312d6c0d0/FLAG695aced8b [2019-11-23 20:20:35,049 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 20:20:35,050 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy1_ground-1.i [2019-11-23 20:20:35,056 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2fda09a5/3c5e836559db4266b8ae608312d6c0d0/FLAG695aced8b [2019-11-23 20:20:35,450 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2fda09a5/3c5e836559db4266b8ae608312d6c0d0 [2019-11-23 20:20:35,459 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 20:20:35,461 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 20:20:35,462 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 20:20:35,462 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 20:20:35,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 20:20:35,467 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,470 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b2439b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35, skipping insertion in model container [2019-11-23 20:20:35,470 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,478 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 20:20:35,494 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 20:20:35,694 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:20:35,698 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 20:20:35,720 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:20:35,740 INFO L208 MainTranslator]: Completed translation [2019-11-23 20:20:35,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35 WrapperNode [2019-11-23 20:20:35,740 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 20:20:35,741 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 20:20:35,741 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 20:20:35,742 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 20:20:35,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,837 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,857 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 20:20:35,858 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 20:20:35,858 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 20:20:35,858 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 20:20:35,865 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,865 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,867 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,872 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,876 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,877 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (1/1) ... [2019-11-23 20:20:35,879 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 20:20:35,880 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 20:20:35,880 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 20:20:35,880 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 20:20:35,881 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (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 [2019-11-23 20:20:35,937 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 20:20:35,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 20:20:35,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 20:20:35,938 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 20:20:35,938 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 20:20:35,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 20:20:36,192 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 20:20:36,193 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-11-23 20:20:36,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:20:36 BoogieIcfgContainer [2019-11-23 20:20:36,195 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 20:20:36,204 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 20:20:36,204 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 20:20:36,214 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 20:20:36,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:20:35" (1/3) ... [2019-11-23 20:20:36,215 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f61c59e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:20:36, skipping insertion in model container [2019-11-23 20:20:36,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:20:35" (2/3) ... [2019-11-23 20:20:36,216 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f61c59e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:20:36, skipping insertion in model container [2019-11-23 20:20:36,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:20:36" (3/3) ... [2019-11-23 20:20:36,220 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy1_ground-1.i [2019-11-23 20:20:36,246 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 20:20:36,259 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 20:20:36,274 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 20:20:36,300 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 20:20:36,300 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 20:20:36,301 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 20:20:36,301 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 20:20:36,301 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 20:20:36,301 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 20:20:36,301 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 20:20:36,301 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 20:20:36,315 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-11-23 20:20:36,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-23 20:20:36,322 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:36,323 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:36,323 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:36,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:36,329 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2019-11-23 20:20:36,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:36,339 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974383310] [2019-11-23 20:20:36,340 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:36,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:36,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 20:20:36,492 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974383310] [2019-11-23 20:20:36,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:20:36,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:20:36,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797959020] [2019-11-23 20:20:36,499 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:20:36,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:36,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:20:36,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:20:36,512 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2019-11-23 20:20:36,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:36,549 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2019-11-23 20:20:36,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:20:36,551 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-23 20:20:36,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:36,561 INFO L225 Difference]: With dead ends: 34 [2019-11-23 20:20:36,561 INFO L226 Difference]: Without dead ends: 16 [2019-11-23 20:20:36,564 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:20:36,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-23 20:20:36,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-23 20:20:36,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-23 20:20:36,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-11-23 20:20:36,598 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2019-11-23 20:20:36,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:36,599 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-11-23 20:20:36,599 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:20:36,599 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-11-23 20:20:36,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-23 20:20:36,600 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:36,600 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:36,601 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:36,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:36,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1564645395, now seen corresponding path program 1 times [2019-11-23 20:20:36,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:36,602 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310427249] [2019-11-23 20:20:36,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:36,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:36,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:20:36,655 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310427249] [2019-11-23 20:20:36,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:20:36,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:20:36,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419753098] [2019-11-23 20:20:36,658 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:20:36,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:36,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:20:36,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:20:36,659 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2019-11-23 20:20:36,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:36,687 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-11-23 20:20:36,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:20:36,688 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-23 20:20:36,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:36,689 INFO L225 Difference]: With dead ends: 24 [2019-11-23 20:20:36,689 INFO L226 Difference]: Without dead ends: 17 [2019-11-23 20:20:36,690 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:20:36,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-23 20:20:36,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-11-23 20:20:36,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-23 20:20:36,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-11-23 20:20:36,694 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2019-11-23 20:20:36,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:36,695 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-11-23 20:20:36,695 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:20:36,695 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-11-23 20:20:36,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-23 20:20:36,695 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:36,696 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:36,696 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:36,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:36,697 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2019-11-23 20:20:36,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:36,697 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563784992] [2019-11-23 20:20:36,697 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:36,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:36,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:20:36,753 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563784992] [2019-11-23 20:20:36,753 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083121282] [2019-11-23 20:20:36,754 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 [2019-11-23 20:20:36,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:36,809 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 20:20:36,815 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:36,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:20:36,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:36,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-11-23 20:20:36,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177795748] [2019-11-23 20:20:36,842 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 20:20:36,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:36,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 20:20:36,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 20:20:36,843 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2019-11-23 20:20:36,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:36,873 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-11-23 20:20:36,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 20:20:36,874 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-11-23 20:20:36,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:36,875 INFO L225 Difference]: With dead ends: 30 [2019-11-23 20:20:36,875 INFO L226 Difference]: Without dead ends: 19 [2019-11-23 20:20:36,876 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 20:20:36,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-23 20:20:36,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-11-23 20:20:36,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-23 20:20:36,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-11-23 20:20:36,881 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-11-23 20:20:36,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:36,881 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-11-23 20:20:36,882 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 20:20:36,882 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-11-23 20:20:36,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-23 20:20:36,883 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:36,884 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:37,088 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:37,089 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:37,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:37,090 INFO L82 PathProgramCache]: Analyzing trace with hash -628241457, now seen corresponding path program 2 times [2019-11-23 20:20:37,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:37,091 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707722038] [2019-11-23 20:20:37,091 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:37,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:37,202 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:20:37,202 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707722038] [2019-11-23 20:20:37,203 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96776261] [2019-11-23 20:20:37,203 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 [2019-11-23 20:20:37,242 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:20:37,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:37,244 INFO L255 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 20:20:37,245 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:37,260 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:20:37,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:37,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-11-23 20:20:37,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169756370] [2019-11-23 20:20:37,262 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 20:20:37,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:37,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 20:20:37,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:20:37,263 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 6 states. [2019-11-23 20:20:37,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:37,300 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2019-11-23 20:20:37,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 20:20:37,301 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-11-23 20:20:37,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:37,302 INFO L225 Difference]: With dead ends: 32 [2019-11-23 20:20:37,302 INFO L226 Difference]: Without dead ends: 21 [2019-11-23 20:20:37,304 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:20:37,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-23 20:20:37,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2019-11-23 20:20:37,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-23 20:20:37,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-23 20:20:37,313 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-11-23 20:20:37,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:37,315 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-23 20:20:37,315 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 20:20:37,315 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-23 20:20:37,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-23 20:20:37,316 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:37,317 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:37,521 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:37,521 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:37,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:37,522 INFO L82 PathProgramCache]: Analyzing trace with hash -705850739, now seen corresponding path program 3 times [2019-11-23 20:20:37,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:37,523 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481124227] [2019-11-23 20:20:37,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:37,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:37,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:20:37,648 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481124227] [2019-11-23 20:20:37,648 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649261331] [2019-11-23 20:20:37,648 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 [2019-11-23 20:20:37,705 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-23 20:20:37,706 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:37,707 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 20:20:37,708 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:37,734 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-23 20:20:37,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:37,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2019-11-23 20:20:37,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195685245] [2019-11-23 20:20:37,735 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 20:20:37,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:37,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 20:20:37,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:20:37,737 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 8 states. [2019-11-23 20:20:37,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:37,806 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2019-11-23 20:20:37,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-23 20:20:37,806 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2019-11-23 20:20:37,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:37,807 INFO L225 Difference]: With dead ends: 37 [2019-11-23 20:20:37,807 INFO L226 Difference]: Without dead ends: 26 [2019-11-23 20:20:37,808 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:20:37,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-23 20:20:37,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2019-11-23 20:20:37,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-23 20:20:37,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-23 20:20:37,814 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-23 20:20:37,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:37,814 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-23 20:20:37,814 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 20:20:37,814 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-23 20:20:37,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-23 20:20:37,815 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:37,815 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:38,018 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:38,019 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:38,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:38,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1754797751, now seen corresponding path program 4 times [2019-11-23 20:20:38,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:38,021 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621342617] [2019-11-23 20:20:38,021 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:38,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:38,102 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 20:20:38,102 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621342617] [2019-11-23 20:20:38,102 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586025578] [2019-11-23 20:20:38,102 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 [2019-11-23 20:20:38,145 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:20:38,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:38,146 INFO L255 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 20:20:38,147 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:38,164 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 20:20:38,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:38,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-23 20:20:38,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667919585] [2019-11-23 20:20:38,165 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 20:20:38,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:38,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 20:20:38,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:20:38,166 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2019-11-23 20:20:38,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:38,205 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2019-11-23 20:20:38,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 20:20:38,205 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-11-23 20:20:38,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:38,206 INFO L225 Difference]: With dead ends: 40 [2019-11-23 20:20:38,206 INFO L226 Difference]: Without dead ends: 27 [2019-11-23 20:20:38,207 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:20:38,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-23 20:20:38,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2019-11-23 20:20:38,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-23 20:20:38,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-11-23 20:20:38,212 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2019-11-23 20:20:38,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:38,212 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-11-23 20:20:38,212 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 20:20:38,212 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-11-23 20:20:38,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-23 20:20:38,213 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:38,213 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:38,417 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:38,417 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:38,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:38,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1539626617, now seen corresponding path program 5 times [2019-11-23 20:20:38,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:38,419 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639821783] [2019-11-23 20:20:38,419 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:38,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:38,510 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 20:20:38,511 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639821783] [2019-11-23 20:20:38,511 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096121100] [2019-11-23 20:20:38,511 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 [2019-11-23 20:20:38,570 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-23 20:20:38,571 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:38,572 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 20:20:38,574 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:38,610 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-23 20:20:38,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:38,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-11-23 20:20:38,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558070700] [2019-11-23 20:20:38,615 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 20:20:38,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:38,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 20:20:38,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:20:38,617 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2019-11-23 20:20:38,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:38,691 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-11-23 20:20:38,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 20:20:38,693 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2019-11-23 20:20:38,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:38,694 INFO L225 Difference]: With dead ends: 45 [2019-11-23 20:20:38,694 INFO L226 Difference]: Without dead ends: 32 [2019-11-23 20:20:38,697 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:20:38,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-23 20:20:38,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-11-23 20:20:38,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-23 20:20:38,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-11-23 20:20:38,706 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2019-11-23 20:20:38,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:38,706 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-11-23 20:20:38,706 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 20:20:38,706 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-11-23 20:20:38,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-23 20:20:38,710 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:38,710 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:38,915 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:38,916 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:38,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:38,916 INFO L82 PathProgramCache]: Analyzing trace with hash -658087101, now seen corresponding path program 6 times [2019-11-23 20:20:38,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:38,917 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826476940] [2019-11-23 20:20:38,917 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:38,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:39,043 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-23 20:20:39,044 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826476940] [2019-11-23 20:20:39,045 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272214339] [2019-11-23 20:20:39,045 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 [2019-11-23 20:20:39,107 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-23 20:20:39,107 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:39,108 INFO L255 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 20:20:39,110 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:39,152 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-23 20:20:39,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:39,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2019-11-23 20:20:39,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579920007] [2019-11-23 20:20:39,154 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-23 20:20:39,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:39,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-23 20:20:39,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:20:39,155 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2019-11-23 20:20:39,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:39,226 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2019-11-23 20:20:39,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-23 20:20:39,229 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2019-11-23 20:20:39,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:39,230 INFO L225 Difference]: With dead ends: 51 [2019-11-23 20:20:39,231 INFO L226 Difference]: Without dead ends: 36 [2019-11-23 20:20:39,231 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:20:39,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-23 20:20:39,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-11-23 20:20:39,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-23 20:20:39,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-11-23 20:20:39,240 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 27 [2019-11-23 20:20:39,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:39,240 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-11-23 20:20:39,240 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-23 20:20:39,240 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-11-23 20:20:39,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-23 20:20:39,242 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:39,242 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:39,445 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:39,446 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:39,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:39,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1326231809, now seen corresponding path program 7 times [2019-11-23 20:20:39,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:39,448 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320959670] [2019-11-23 20:20:39,448 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:39,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:39,551 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:20:39,552 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320959670] [2019-11-23 20:20:39,552 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392176457] [2019-11-23 20:20:39,552 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 [2019-11-23 20:20:39,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:39,602 INFO L255 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 20:20:39,605 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:39,626 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:20:39,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:39,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-11-23 20:20:39,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430277672] [2019-11-23 20:20:39,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 20:20:39,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:39,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 20:20:39,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:20:39,631 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 11 states. [2019-11-23 20:20:39,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:39,681 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2019-11-23 20:20:39,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 20:20:39,683 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2019-11-23 20:20:39,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:39,684 INFO L225 Difference]: With dead ends: 54 [2019-11-23 20:20:39,684 INFO L226 Difference]: Without dead ends: 37 [2019-11-23 20:20:39,684 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:20:39,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-23 20:20:39,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-11-23 20:20:39,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-23 20:20:39,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-23 20:20:39,703 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2019-11-23 20:20:39,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:39,703 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-23 20:20:39,703 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 20:20:39,703 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-23 20:20:39,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-23 20:20:39,708 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:39,708 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:39,908 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:39,909 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:39,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:39,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1310316989, now seen corresponding path program 8 times [2019-11-23 20:20:39,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:39,911 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125902130] [2019-11-23 20:20:39,912 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:39,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:40,023 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:20:40,024 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125902130] [2019-11-23 20:20:40,024 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642085493] [2019-11-23 20:20:40,024 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 [2019-11-23 20:20:40,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:20:40,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:40,070 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-23 20:20:40,072 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:40,095 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:20:40,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:40,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-11-23 20:20:40,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001079733] [2019-11-23 20:20:40,097 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 20:20:40,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:40,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 20:20:40,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 20:20:40,098 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 12 states. [2019-11-23 20:20:40,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:40,147 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2019-11-23 20:20:40,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 20:20:40,148 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2019-11-23 20:20:40,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:40,149 INFO L225 Difference]: With dead ends: 56 [2019-11-23 20:20:40,149 INFO L226 Difference]: Without dead ends: 39 [2019-11-23 20:20:40,149 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 20:20:40,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-23 20:20:40,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2019-11-23 20:20:40,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-23 20:20:40,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2019-11-23 20:20:40,154 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2019-11-23 20:20:40,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:40,155 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2019-11-23 20:20:40,155 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 20:20:40,155 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2019-11-23 20:20:40,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-23 20:20:40,156 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:40,156 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:40,359 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:40,359 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:40,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:40,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1003007227, now seen corresponding path program 9 times [2019-11-23 20:20:40,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:40,360 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098546289] [2019-11-23 20:20:40,360 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:40,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:40,509 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:20:40,509 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098546289] [2019-11-23 20:20:40,509 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442011768] [2019-11-23 20:20:40,510 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 [2019-11-23 20:20:40,561 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-23 20:20:40,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:40,562 INFO L255 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 20:20:40,565 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:40,636 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 20:20:40,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:40,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 17 [2019-11-23 20:20:40,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079037814] [2019-11-23 20:20:40,638 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 20:20:40,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:40,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 20:20:40,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:20:40,638 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 17 states. [2019-11-23 20:20:40,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:40,738 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2019-11-23 20:20:40,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 20:20:40,740 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2019-11-23 20:20:40,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:40,741 INFO L225 Difference]: With dead ends: 61 [2019-11-23 20:20:40,741 INFO L226 Difference]: Without dead ends: 44 [2019-11-23 20:20:40,742 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:20:40,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-23 20:20:40,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-11-23 20:20:40,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-23 20:20:40,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-11-23 20:20:40,751 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 35 [2019-11-23 20:20:40,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:40,751 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-11-23 20:20:40,751 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 20:20:40,751 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-11-23 20:20:40,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-23 20:20:40,755 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:40,755 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:40,964 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:40,964 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:40,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:40,964 INFO L82 PathProgramCache]: Analyzing trace with hash -707072841, now seen corresponding path program 10 times [2019-11-23 20:20:40,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:40,965 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014104565] [2019-11-23 20:20:40,965 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:41,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:41,117 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-23 20:20:41,118 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014104565] [2019-11-23 20:20:41,118 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009272195] [2019-11-23 20:20:41,118 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 [2019-11-23 20:20:41,163 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:20:41,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:41,164 INFO L255 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-23 20:20:41,166 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:41,263 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:20:41,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:41,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2019-11-23 20:20:41,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925164905] [2019-11-23 20:20:41,265 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-23 20:20:41,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:41,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-23 20:20:41,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:20:41,265 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 19 states. [2019-11-23 20:20:41,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:41,374 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2019-11-23 20:20:41,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 20:20:41,374 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2019-11-23 20:20:41,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:41,375 INFO L225 Difference]: With dead ends: 67 [2019-11-23 20:20:41,375 INFO L226 Difference]: Without dead ends: 48 [2019-11-23 20:20:41,376 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:20:41,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-23 20:20:41,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2019-11-23 20:20:41,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-23 20:20:41,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2019-11-23 20:20:41,381 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 39 [2019-11-23 20:20:41,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:41,381 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2019-11-23 20:20:41,381 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-23 20:20:41,381 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2019-11-23 20:20:41,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-23 20:20:41,382 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:41,382 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:41,585 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:41,586 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:41,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:41,587 INFO L82 PathProgramCache]: Analyzing trace with hash -593240461, now seen corresponding path program 11 times [2019-11-23 20:20:41,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:41,588 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647384200] [2019-11-23 20:20:41,588 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:41,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:41,751 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-23 20:20:41,752 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647384200] [2019-11-23 20:20:41,752 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484034950] [2019-11-23 20:20:41,753 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 [2019-11-23 20:20:42,245 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-23 20:20:42,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:42,247 INFO L255 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 20:20:42,249 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:42,349 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:20:42,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:42,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 21 [2019-11-23 20:20:42,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718227241] [2019-11-23 20:20:42,350 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-23 20:20:42,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:42,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-23 20:20:42,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2019-11-23 20:20:42,351 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 21 states. [2019-11-23 20:20:42,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:42,442 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2019-11-23 20:20:42,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 20:20:42,448 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2019-11-23 20:20:42,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:42,449 INFO L225 Difference]: With dead ends: 73 [2019-11-23 20:20:42,449 INFO L226 Difference]: Without dead ends: 52 [2019-11-23 20:20:42,450 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2019-11-23 20:20:42,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-23 20:20:42,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2019-11-23 20:20:42,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-23 20:20:42,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-11-23 20:20:42,458 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 43 [2019-11-23 20:20:42,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:42,459 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-11-23 20:20:42,459 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-23 20:20:42,459 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-11-23 20:20:42,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-23 20:20:42,460 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:42,460 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:42,671 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:42,671 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:42,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:42,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1073644079, now seen corresponding path program 12 times [2019-11-23 20:20:42,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:42,673 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864418886] [2019-11-23 20:20:42,673 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:42,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:42,753 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-23 20:20:42,754 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864418886] [2019-11-23 20:20:42,754 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677596833] [2019-11-23 20:20:42,754 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 [2019-11-23 20:20:43,547 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-23 20:20:43,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:43,550 INFO L255 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 20:20:43,552 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:43,564 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-23 20:20:43,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:43,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-11-23 20:20:43,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489529191] [2019-11-23 20:20:43,566 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 20:20:43,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:43,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 20:20:43,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:20:43,566 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 11 states. [2019-11-23 20:20:43,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:43,605 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2019-11-23 20:20:43,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 20:20:43,605 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 47 [2019-11-23 20:20:43,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:43,606 INFO L225 Difference]: With dead ends: 60 [2019-11-23 20:20:43,606 INFO L226 Difference]: Without dead ends: 53 [2019-11-23 20:20:43,607 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:20:43,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-23 20:20:43,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-11-23 20:20:43,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-23 20:20:43,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-23 20:20:43,613 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2019-11-23 20:20:43,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:43,613 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-23 20:20:43,613 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 20:20:43,613 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-23 20:20:43,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-23 20:20:43,614 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:43,614 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:43,817 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:43,817 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:43,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:43,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1669775187, now seen corresponding path program 13 times [2019-11-23 20:20:43,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:43,819 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425324499] [2019-11-23 20:20:43,819 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:43,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:43,953 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-23 20:20:43,953 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425324499] [2019-11-23 20:20:43,953 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895302214] [2019-11-23 20:20:43,953 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 [2019-11-23 20:20:44,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:44,006 INFO L255 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 20:20:44,015 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:44,187 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-23 20:20:44,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:44,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 24 [2019-11-23 20:20:44,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154842799] [2019-11-23 20:20:44,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-23 20:20:44,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:44,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-23 20:20:44,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2019-11-23 20:20:44,189 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 24 states. [2019-11-23 20:20:44,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:44,315 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2019-11-23 20:20:44,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-23 20:20:44,315 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2019-11-23 20:20:44,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:44,316 INFO L225 Difference]: With dead ends: 83 [2019-11-23 20:20:44,316 INFO L226 Difference]: Without dead ends: 58 [2019-11-23 20:20:44,317 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2019-11-23 20:20:44,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-23 20:20:44,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-11-23 20:20:44,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-23 20:20:44,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-11-23 20:20:44,322 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2019-11-23 20:20:44,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:44,322 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-11-23 20:20:44,322 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-23 20:20:44,323 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-11-23 20:20:44,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-23 20:20:44,323 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:44,323 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:44,527 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:44,527 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:44,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:44,528 INFO L82 PathProgramCache]: Analyzing trace with hash 557979497, now seen corresponding path program 14 times [2019-11-23 20:20:44,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:44,529 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481838798] [2019-11-23 20:20:44,529 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:44,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 20:20:44,700 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481838798] [2019-11-23 20:20:44,700 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889526790] [2019-11-23 20:20:44,701 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 [2019-11-23 20:20:44,761 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:20:44,761 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:44,762 INFO L255 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 20:20:44,768 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:44,795 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 20:20:44,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:44,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-11-23 20:20:44,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957250611] [2019-11-23 20:20:44,797 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 20:20:44,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:44,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 20:20:44,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:20:44,798 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 17 states. [2019-11-23 20:20:44,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:44,864 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2019-11-23 20:20:44,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-23 20:20:44,866 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2019-11-23 20:20:44,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:44,867 INFO L225 Difference]: With dead ends: 86 [2019-11-23 20:20:44,867 INFO L226 Difference]: Without dead ends: 59 [2019-11-23 20:20:44,868 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:20:44,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-23 20:20:44,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-11-23 20:20:44,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-23 20:20:44,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-11-23 20:20:44,883 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2019-11-23 20:20:44,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:44,884 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-11-23 20:20:44,884 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 20:20:44,884 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-11-23 20:20:44,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-23 20:20:44,886 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:44,886 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:45,090 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:45,091 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:45,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:45,091 INFO L82 PathProgramCache]: Analyzing trace with hash -1957371993, now seen corresponding path program 15 times [2019-11-23 20:20:45,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:45,092 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114453668] [2019-11-23 20:20:45,092 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:45,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:45,283 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 20:20:45,283 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114453668] [2019-11-23 20:20:45,284 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890861102] [2019-11-23 20:20:45,284 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 [2019-11-23 20:20:45,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-23 20:20:45,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:45,644 INFO L255 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-23 20:20:45,646 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:45,793 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:20:45,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:45,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 27 [2019-11-23 20:20:45,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324447770] [2019-11-23 20:20:45,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-23 20:20:45,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:45,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-23 20:20:45,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=501, Unknown=0, NotChecked=0, Total=702 [2019-11-23 20:20:45,796 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 27 states. [2019-11-23 20:20:45,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:45,913 INFO L93 Difference]: Finished difference Result 91 states and 96 transitions. [2019-11-23 20:20:45,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-23 20:20:45,914 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2019-11-23 20:20:45,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:45,914 INFO L225 Difference]: With dead ends: 91 [2019-11-23 20:20:45,915 INFO L226 Difference]: Without dead ends: 64 [2019-11-23 20:20:45,916 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=201, Invalid=501, Unknown=0, NotChecked=0, Total=702 [2019-11-23 20:20:45,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-23 20:20:45,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-11-23 20:20:45,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-11-23 20:20:45,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2019-11-23 20:20:45,921 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 55 [2019-11-23 20:20:45,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:45,921 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2019-11-23 20:20:45,921 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-23 20:20:45,922 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2019-11-23 20:20:45,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-23 20:20:45,922 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:45,922 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:46,127 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:46,127 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:46,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:46,128 INFO L82 PathProgramCache]: Analyzing trace with hash -2105108125, now seen corresponding path program 16 times [2019-11-23 20:20:46,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:46,129 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038127129] [2019-11-23 20:20:46,129 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:46,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:46,278 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:20:46,278 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038127129] [2019-11-23 20:20:46,279 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928771865] [2019-11-23 20:20:46,279 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 [2019-11-23 20:20:46,330 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:20:46,331 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:46,332 INFO L255 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-23 20:20:46,334 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:46,368 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:20:46,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:46,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-11-23 20:20:46,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241136059] [2019-11-23 20:20:46,370 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-23 20:20:46,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:46,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-23 20:20:46,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:20:46,371 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 19 states. [2019-11-23 20:20:46,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:46,433 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2019-11-23 20:20:46,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 20:20:46,434 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2019-11-23 20:20:46,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:46,434 INFO L225 Difference]: With dead ends: 94 [2019-11-23 20:20:46,434 INFO L226 Difference]: Without dead ends: 65 [2019-11-23 20:20:46,435 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:20:46,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-11-23 20:20:46,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-11-23 20:20:46,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-23 20:20:46,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-11-23 20:20:46,439 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2019-11-23 20:20:46,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:46,440 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-11-23 20:20:46,440 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-23 20:20:46,440 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-11-23 20:20:46,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-23 20:20:46,441 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:46,441 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:46,650 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:46,650 INFO L410 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:46,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:46,651 INFO L82 PathProgramCache]: Analyzing trace with hash 1160100641, now seen corresponding path program 17 times [2019-11-23 20:20:46,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:46,651 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934594114] [2019-11-23 20:20:46,651 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:46,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:46,842 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:20:46,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934594114] [2019-11-23 20:20:46,843 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859742729] [2019-11-23 20:20:46,843 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 [2019-11-23 20:20:52,921 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2019-11-23 20:20:52,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:52,929 INFO L255 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 20:20:52,930 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:52,948 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:20:52,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:52,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-11-23 20:20:52,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035446513] [2019-11-23 20:20:52,949 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-23 20:20:52,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:52,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-23 20:20:52,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 20:20:52,950 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 20 states. [2019-11-23 20:20:53,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:53,018 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2019-11-23 20:20:53,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 20:20:53,019 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2019-11-23 20:20:53,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:53,019 INFO L225 Difference]: With dead ends: 96 [2019-11-23 20:20:53,019 INFO L226 Difference]: Without dead ends: 67 [2019-11-23 20:20:53,020 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 20:20:53,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-23 20:20:53,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2019-11-23 20:20:53,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-23 20:20:53,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2019-11-23 20:20:53,024 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2019-11-23 20:20:53,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:53,025 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2019-11-23 20:20:53,025 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-23 20:20:53,025 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2019-11-23 20:20:53,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-23 20:20:53,026 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:53,026 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:53,226 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:53,227 INFO L410 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:53,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:53,227 INFO L82 PathProgramCache]: Analyzing trace with hash -595368609, now seen corresponding path program 18 times [2019-11-23 20:20:53,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:53,228 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138982908] [2019-11-23 20:20:53,228 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:53,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:20:53,432 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138982908] [2019-11-23 20:20:53,433 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29495860] [2019-11-23 20:20:53,433 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 [2019-11-23 20:20:56,313 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2019-11-23 20:20:56,313 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:56,317 INFO L255 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-23 20:20:56,318 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:56,512 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-23 20:20:56,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:56,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 13] total 31 [2019-11-23 20:20:56,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774800130] [2019-11-23 20:20:56,513 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-23 20:20:56,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:56,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-23 20:20:56,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=663, Unknown=0, NotChecked=0, Total=930 [2019-11-23 20:20:56,514 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 31 states. [2019-11-23 20:20:56,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:56,678 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2019-11-23 20:20:56,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-23 20:20:56,679 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 63 [2019-11-23 20:20:56,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:56,680 INFO L225 Difference]: With dead ends: 101 [2019-11-23 20:20:56,680 INFO L226 Difference]: Without dead ends: 72 [2019-11-23 20:20:56,681 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=267, Invalid=663, Unknown=0, NotChecked=0, Total=930 [2019-11-23 20:20:56,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-23 20:20:56,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2019-11-23 20:20:56,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-23 20:20:56,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2019-11-23 20:20:56,686 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 63 [2019-11-23 20:20:56,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:56,686 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2019-11-23 20:20:56,686 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-23 20:20:56,686 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2019-11-23 20:20:56,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-23 20:20:56,687 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:56,687 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:56,892 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:56,893 INFO L410 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:56,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:56,893 INFO L82 PathProgramCache]: Analyzing trace with hash 724857627, now seen corresponding path program 19 times [2019-11-23 20:20:56,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:56,894 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246019114] [2019-11-23 20:20:56,894 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:56,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:57,126 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:20:57,126 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246019114] [2019-11-23 20:20:57,126 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651267748] [2019-11-23 20:20:57,127 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 [2019-11-23 20:20:57,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:57,186 INFO L255 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-23 20:20:57,188 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:57,213 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:20:57,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:57,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2019-11-23 20:20:57,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608712140] [2019-11-23 20:20:57,214 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-23 20:20:57,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:57,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-23 20:20:57,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 20:20:57,215 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 22 states. [2019-11-23 20:20:57,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:57,284 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2019-11-23 20:20:57,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 20:20:57,284 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2019-11-23 20:20:57,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:57,285 INFO L225 Difference]: With dead ends: 104 [2019-11-23 20:20:57,285 INFO L226 Difference]: Without dead ends: 73 [2019-11-23 20:20:57,286 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 20:20:57,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-23 20:20:57,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2019-11-23 20:20:57,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-23 20:20:57,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-11-23 20:20:57,291 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 67 [2019-11-23 20:20:57,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:57,292 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-11-23 20:20:57,292 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-23 20:20:57,292 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-11-23 20:20:57,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-23 20:20:57,293 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:57,293 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:57,500 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:57,501 INFO L410 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:57,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:57,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1142098215, now seen corresponding path program 20 times [2019-11-23 20:20:57,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:57,502 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089745857] [2019-11-23 20:20:57,502 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:57,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:57,765 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:20:57,765 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089745857] [2019-11-23 20:20:57,765 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801088943] [2019-11-23 20:20:57,765 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 [2019-11-23 20:20:57,832 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:20:57,832 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:57,834 INFO L255 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-23 20:20:57,836 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:57,872 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:20:57,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:57,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-11-23 20:20:57,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113853760] [2019-11-23 20:20:57,874 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-23 20:20:57,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:57,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-23 20:20:57,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2019-11-23 20:20:57,874 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 23 states. [2019-11-23 20:20:57,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:57,952 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2019-11-23 20:20:57,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-23 20:20:57,954 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 69 [2019-11-23 20:20:57,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:57,955 INFO L225 Difference]: With dead ends: 106 [2019-11-23 20:20:57,955 INFO L226 Difference]: Without dead ends: 75 [2019-11-23 20:20:57,956 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2019-11-23 20:20:57,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-11-23 20:20:57,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-11-23 20:20:57,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-11-23 20:20:57,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2019-11-23 20:20:57,959 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 69 [2019-11-23 20:20:57,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:57,959 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2019-11-23 20:20:57,959 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-23 20:20:57,959 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2019-11-23 20:20:57,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-11-23 20:20:57,960 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:57,960 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:58,160 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:58,161 INFO L410 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:58,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:58,161 INFO L82 PathProgramCache]: Analyzing trace with hash 9667351, now seen corresponding path program 21 times [2019-11-23 20:20:58,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:58,162 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349502526] [2019-11-23 20:20:58,162 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:58,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:20:58,421 INFO L134 CoverageAnalysis]: Checked inductivity of 521 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:20:58,421 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349502526] [2019-11-23 20:20:58,421 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200058276] [2019-11-23 20:20:58,421 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:59,263 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-23 20:20:59,263 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:20:59,266 INFO L255 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 20:20:59,267 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:20:59,487 INFO L134 CoverageAnalysis]: Checked inductivity of 521 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-11-23 20:20:59,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:20:59,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 14] total 35 [2019-11-23 20:20:59,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501645910] [2019-11-23 20:20:59,489 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-23 20:20:59,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:20:59,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-23 20:20:59,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=847, Unknown=0, NotChecked=0, Total=1190 [2019-11-23 20:20:59,490 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 35 states. [2019-11-23 20:20:59,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:20:59,651 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2019-11-23 20:20:59,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-23 20:20:59,652 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 71 [2019-11-23 20:20:59,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:20:59,653 INFO L225 Difference]: With dead ends: 111 [2019-11-23 20:20:59,653 INFO L226 Difference]: Without dead ends: 80 [2019-11-23 20:20:59,654 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=343, Invalid=847, Unknown=0, NotChecked=0, Total=1190 [2019-11-23 20:20:59,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-11-23 20:20:59,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2019-11-23 20:20:59,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-11-23 20:20:59,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2019-11-23 20:20:59,659 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 71 [2019-11-23 20:20:59,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:20:59,659 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2019-11-23 20:20:59,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-23 20:20:59,660 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2019-11-23 20:20:59,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-23 20:20:59,660 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:20:59,660 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:20:59,863 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:20:59,863 INFO L410 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:20:59,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:20:59,864 INFO L82 PathProgramCache]: Analyzing trace with hash -977541933, now seen corresponding path program 22 times [2019-11-23 20:20:59,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:20:59,865 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045629464] [2019-11-23 20:20:59,865 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:20:59,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:21:00,153 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-23 20:21:00,153 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045629464] [2019-11-23 20:21:00,153 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943280370] [2019-11-23 20:21:00,153 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:21:00,220 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:21:00,220 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:21:00,222 INFO L255 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 20:21:00,223 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:21:00,485 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-23 20:21:00,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:21:00,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 15] total 37 [2019-11-23 20:21:00,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086271343] [2019-11-23 20:21:00,486 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-23 20:21:00,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:21:00,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-23 20:21:00,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=952, Unknown=0, NotChecked=0, Total=1332 [2019-11-23 20:21:00,487 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 37 states. [2019-11-23 20:21:00,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:21:00,645 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-11-23 20:21:00,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-23 20:21:00,646 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 75 [2019-11-23 20:21:00,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:21:00,647 INFO L225 Difference]: With dead ends: 117 [2019-11-23 20:21:00,647 INFO L226 Difference]: Without dead ends: 84 [2019-11-23 20:21:00,648 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=952, Unknown=0, NotChecked=0, Total=1332 [2019-11-23 20:21:00,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-23 20:21:00,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-11-23 20:21:00,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-11-23 20:21:00,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2019-11-23 20:21:00,651 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 75 [2019-11-23 20:21:00,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:21:00,651 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2019-11-23 20:21:00,651 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-23 20:21:00,651 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2019-11-23 20:21:00,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-23 20:21:00,652 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:21:00,652 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:21:00,856 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:21:00,856 INFO L410 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:21:00,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:21:00,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1012267151, now seen corresponding path program 23 times [2019-11-23 20:21:00,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:21:00,858 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769781211] [2019-11-23 20:21:00,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:21:00,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:21:01,161 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-11-23 20:21:01,161 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769781211] [2019-11-23 20:21:01,161 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253630018] [2019-11-23 20:21:01,161 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:21:43,992 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 23 check-sat command(s) [2019-11-23 20:21:43,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:21:44,016 INFO L255 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 20:21:44,017 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:21:44,299 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-11-23 20:21:44,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:21:44,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 16] total 39 [2019-11-23 20:21:44,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966327212] [2019-11-23 20:21:44,301 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-23 20:21:44,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:21:44,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-23 20:21:44,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1063, Unknown=0, NotChecked=0, Total=1482 [2019-11-23 20:21:44,302 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 39 states. [2019-11-23 20:21:44,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:21:44,492 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-11-23 20:21:44,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-23 20:21:44,493 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 79 [2019-11-23 20:21:44,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:21:44,493 INFO L225 Difference]: With dead ends: 123 [2019-11-23 20:21:44,493 INFO L226 Difference]: Without dead ends: 88 [2019-11-23 20:21:44,494 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=419, Invalid=1063, Unknown=0, NotChecked=0, Total=1482 [2019-11-23 20:21:44,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-11-23 20:21:44,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2019-11-23 20:21:44,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-11-23 20:21:44,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2019-11-23 20:21:44,497 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 79 [2019-11-23 20:21:44,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:21:44,498 INFO L462 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2019-11-23 20:21:44,498 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-23 20:21:44,498 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2019-11-23 20:21:44,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-23 20:21:44,499 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:21:44,499 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:21:44,708 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:21:44,708 INFO L410 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:21:44,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:21:44,709 INFO L82 PathProgramCache]: Analyzing trace with hash -943931829, now seen corresponding path program 24 times [2019-11-23 20:21:44,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:21:44,709 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42027136] [2019-11-23 20:21:44,710 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:21:44,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:21:45,031 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:21:45,032 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42027136] [2019-11-23 20:21:45,032 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366026583] [2019-11-23 20:21:45,032 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:20,719 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2019-11-23 20:22:20,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:20,736 INFO L255 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-23 20:22:20,738 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:20,760 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:22:20,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:20,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2019-11-23 20:22:20,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952950673] [2019-11-23 20:22:20,761 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-23 20:22:20,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:20,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-23 20:22:20,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2019-11-23 20:22:20,762 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 27 states. [2019-11-23 20:22:20,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:20,846 INFO L93 Difference]: Finished difference Result 126 states and 130 transitions. [2019-11-23 20:22:20,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-23 20:22:20,846 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2019-11-23 20:22:20,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:20,847 INFO L225 Difference]: With dead ends: 126 [2019-11-23 20:22:20,847 INFO L226 Difference]: Without dead ends: 89 [2019-11-23 20:22:20,848 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2019-11-23 20:22:20,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-11-23 20:22:20,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-11-23 20:22:20,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-23 20:22:20,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-11-23 20:22:20,851 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 83 [2019-11-23 20:22:20,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:20,851 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-11-23 20:22:20,852 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-23 20:22:20,852 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-11-23 20:22:20,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-11-23 20:22:20,853 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:20,853 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:21,065 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:21,065 INFO L410 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:21,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:21,066 INFO L82 PathProgramCache]: Analyzing trace with hash -1289615863, now seen corresponding path program 25 times [2019-11-23 20:22:21,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:21,066 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644936812] [2019-11-23 20:22:21,067 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:21,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:21,379 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:22:21,380 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644936812] [2019-11-23 20:22:21,380 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172320837] [2019-11-23 20:22:21,380 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:21,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:21,440 INFO L255 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-23 20:22:21,442 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:21,467 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:22:21,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:21,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2019-11-23 20:22:21,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110463286] [2019-11-23 20:22:21,468 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-23 20:22:21,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:21,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-23 20:22:21,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-11-23 20:22:21,469 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 28 states. [2019-11-23 20:22:21,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:21,536 INFO L93 Difference]: Finished difference Result 128 states and 132 transitions. [2019-11-23 20:22:21,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-23 20:22:21,536 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2019-11-23 20:22:21,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:21,537 INFO L225 Difference]: With dead ends: 128 [2019-11-23 20:22:21,537 INFO L226 Difference]: Without dead ends: 91 [2019-11-23 20:22:21,538 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-11-23 20:22:21,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-23 20:22:21,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2019-11-23 20:22:21,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-11-23 20:22:21,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2019-11-23 20:22:21,541 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2019-11-23 20:22:21,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:21,541 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2019-11-23 20:22:21,541 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-23 20:22:21,541 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2019-11-23 20:22:21,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-23 20:22:21,542 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:21,542 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:21,745 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:21,746 INFO L410 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:21,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:21,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1515476551, now seen corresponding path program 26 times [2019-11-23 20:22:21,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:21,747 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087641817] [2019-11-23 20:22:21,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:21,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:22,072 INFO L134 CoverageAnalysis]: Checked inductivity of 821 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:22:22,073 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087641817] [2019-11-23 20:22:22,073 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308018305] [2019-11-23 20:22:22,073 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:22,132 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:22:22,132 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:22,134 INFO L255 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-23 20:22:22,136 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:22,160 INFO L134 CoverageAnalysis]: Checked inductivity of 821 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:22:22,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:22,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2019-11-23 20:22:22,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015868541] [2019-11-23 20:22:22,161 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-23 20:22:22,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:22,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-23 20:22:22,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2019-11-23 20:22:22,162 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 29 states. [2019-11-23 20:22:22,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:22,244 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2019-11-23 20:22:22,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-23 20:22:22,244 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 87 [2019-11-23 20:22:22,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:22,245 INFO L225 Difference]: With dead ends: 130 [2019-11-23 20:22:22,245 INFO L226 Difference]: Without dead ends: 93 [2019-11-23 20:22:22,246 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2019-11-23 20:22:22,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-11-23 20:22:22,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2019-11-23 20:22:22,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-11-23 20:22:22,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-11-23 20:22:22,249 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 87 [2019-11-23 20:22:22,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:22,249 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-11-23 20:22:22,249 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-23 20:22:22,249 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-11-23 20:22:22,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2019-11-23 20:22:22,250 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:22,250 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:22,454 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:22,454 INFO L410 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:22,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:22,455 INFO L82 PathProgramCache]: Analyzing trace with hash -30175483, now seen corresponding path program 27 times [2019-11-23 20:22:22,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:22,456 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958855352] [2019-11-23 20:22:22,456 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:22,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:22,910 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:22:22,911 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958855352] [2019-11-23 20:22:22,911 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966787073] [2019-11-23 20:22:22,911 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true