/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/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_minInArray_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:45:33,051 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:45:33,053 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:45:33,065 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:45:33,065 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:45:33,067 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:45:33,068 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:45:33,070 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:45:33,071 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:45:33,072 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:45:33,073 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:45:33,074 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:45:33,075 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:45:33,076 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:45:33,077 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:45:33,078 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:45:33,079 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:45:33,080 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:45:33,082 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:45:33,084 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:45:33,086 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:45:33,087 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:45:33,088 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:45:33,089 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:45:33,092 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:45:33,096 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:45:33,096 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:45:33,097 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:45:33,098 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:45:33,099 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:45:33,100 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:45:33,100 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:45:33,101 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:45:33,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:45:33,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:45:33,102 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:45:33,103 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 [2019-11-06 18:45:33,119 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:45:33,119 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:45:33,120 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:45:33,120 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:45:33,121 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:45:33,121 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:45:33,121 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:45:33,121 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:45:33,121 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:45:33,122 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:45:33,122 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:45:33,122 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:45:33,122 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:45:33,122 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:45:33,123 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:45:33,123 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:45:33,123 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:45:33,123 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:45:33,124 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:45:33,124 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:45:33,124 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:45:33,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:45:33,124 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:45:33,125 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:45:33,125 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:45:33,125 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:45:33,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:45:33,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:45:33,126 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:45:33,413 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:45:33,426 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:45:33,429 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:45:33,430 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:45:33,431 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:45:33,431 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_minInArray_ground-2.i [2019-11-06 18:45:33,488 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e08e7d1f5/49490c4de119445f860309aa0c4ea958/FLAGf62b11ff6 [2019-11-06 18:45:33,919 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:45:33,919 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_minInArray_ground-2.i [2019-11-06 18:45:33,926 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e08e7d1f5/49490c4de119445f860309aa0c4ea958/FLAGf62b11ff6 [2019-11-06 18:45:34,324 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e08e7d1f5/49490c4de119445f860309aa0c4ea958 [2019-11-06 18:45:34,335 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:45:34,336 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:45:34,338 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:45:34,338 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:45:34,342 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:45:34,343 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,345 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44932c6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34, skipping insertion in model container [2019-11-06 18:45:34,346 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,354 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:45:34,378 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:45:34,579 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:45:34,583 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:45:34,604 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:45:34,622 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:45:34,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34 WrapperNode [2019-11-06 18:45:34,623 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:45:34,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:45:34,623 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:45:34,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:45:34,720 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,721 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,731 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,733 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,753 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,762 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,763 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (1/1) ... [2019-11-06 18:45:34,765 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:45:34,766 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:45:34,766 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:45:34,766 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:45:34,767 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (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 [2019-11-06 18:45:34,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:45:34,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:45:34,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:45:34,827 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:45:34,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:45:34,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:45:34,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:45:34,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:45:35,070 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:45:35,071 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:45:35,077 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:45:35 BoogieIcfgContainer [2019-11-06 18:45:35,077 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:45:35,079 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:45:35,082 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:45:35,088 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:45:35,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:45:34" (1/3) ... [2019-11-06 18:45:35,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8540866 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:45:35, skipping insertion in model container [2019-11-06 18:45:35,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:34" (2/3) ... [2019-11-06 18:45:35,094 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8540866 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:45:35, skipping insertion in model container [2019-11-06 18:45:35,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:45:35" (3/3) ... [2019-11-06 18:45:35,096 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_minInArray_ground-2.i [2019-11-06 18:45:35,114 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:45:35,121 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:45:35,135 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:45:35,168 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:45:35,168 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:45:35,168 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:45:35,168 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:45:35,169 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:45:35,169 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:45:35,169 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:45:35,169 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:45:35,186 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-11-06 18:45:35,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:45:35,192 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:35,192 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:35,194 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:35,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:35,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1241254978, now seen corresponding path program 1 times [2019-11-06 18:45:35,207 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:35,208 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874523657] [2019-11-06 18:45:35,208 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:35,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:45:35,385 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874523657] [2019-11-06 18:45:35,386 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:45:35,386 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:45:35,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203999610] [2019-11-06 18:45:35,394 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:45:35,394 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:35,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:45:35,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:45:35,414 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 3 states. [2019-11-06 18:45:35,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:35,584 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2019-11-06 18:45:35,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:45:35,586 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:45:35,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:35,598 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:45:35,598 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 18:45:35,604 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:45:35,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 18:45:35,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-06 18:45:35,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:45:35,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-11-06 18:45:35,658 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 15 [2019-11-06 18:45:35,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:35,660 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-11-06 18:45:35,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:45:35,660 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-11-06 18:45:35,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:45:35,661 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:35,662 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:35,663 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:35,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:35,664 INFO L82 PathProgramCache]: Analyzing trace with hash -159068691, now seen corresponding path program 1 times [2019-11-06 18:45:35,664 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:35,665 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064764892] [2019-11-06 18:45:35,665 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:35,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:45:35,762 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064764892] [2019-11-06 18:45:35,762 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:45:35,762 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:45:35,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821543006] [2019-11-06 18:45:35,764 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:45:35,765 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:35,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:45:35,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:45:35,766 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 4 states. [2019-11-06 18:45:35,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:35,842 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2019-11-06 18:45:35,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:45:35,843 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:45:35,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:35,844 INFO L225 Difference]: With dead ends: 43 [2019-11-06 18:45:35,844 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:45:35,846 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:45:35,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:45:35,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2019-11-06 18:45:35,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 18:45:35,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-11-06 18:45:35,854 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 15 [2019-11-06 18:45:35,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:35,854 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-11-06 18:45:35,855 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:45:35,855 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-11-06 18:45:35,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:45:35,856 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:35,856 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:35,856 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:35,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:35,857 INFO L82 PathProgramCache]: Analyzing trace with hash 99818017, now seen corresponding path program 1 times [2019-11-06 18:45:35,857 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:35,858 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256400272] [2019-11-06 18:45:35,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:35,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:45:35,942 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256400272] [2019-11-06 18:45:35,942 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133984105] [2019-11-06 18:45:35,942 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 [2019-11-06 18:45:35,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:35,991 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:45:35,997 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:36,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:45:36,031 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:36,031 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:45:36,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173433241] [2019-11-06 18:45:36,032 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:45:36,032 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:36,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:45:36,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:45:36,033 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 6 states. [2019-11-06 18:45:36,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:36,136 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2019-11-06 18:45:36,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:45:36,138 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-11-06 18:45:36,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:36,139 INFO L225 Difference]: With dead ends: 49 [2019-11-06 18:45:36,139 INFO L226 Difference]: Without dead ends: 33 [2019-11-06 18:45:36,140 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:45:36,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-06 18:45:36,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2019-11-06 18:45:36,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 18:45:36,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-11-06 18:45:36,147 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2019-11-06 18:45:36,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:36,147 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-11-06 18:45:36,148 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:45:36,148 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-11-06 18:45:36,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:45:36,149 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:36,149 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:36,354 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:36,354 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:36,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:36,355 INFO L82 PathProgramCache]: Analyzing trace with hash -1510721175, now seen corresponding path program 2 times [2019-11-06 18:45:36,356 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:36,356 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291278422] [2019-11-06 18:45:36,357 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:36,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:36,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:36,482 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-06 18:45:36,483 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291278422] [2019-11-06 18:45:36,483 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802315489] [2019-11-06 18:45:36,484 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 [2019-11-06 18:45:36,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:36,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:36,568 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:45:36,571 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:36,587 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-06 18:45:36,588 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:36,588 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:45:36,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820555020] [2019-11-06 18:45:36,590 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:45:36,590 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:36,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:45:36,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:45:36,591 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 7 states. [2019-11-06 18:45:36,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:36,705 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2019-11-06 18:45:36,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:45:36,705 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-11-06 18:45:36,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:36,706 INFO L225 Difference]: With dead ends: 57 [2019-11-06 18:45:36,707 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 18:45:36,707 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:45:36,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 18:45:36,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2019-11-06 18:45:36,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:45:36,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2019-11-06 18:45:36,714 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 25 [2019-11-06 18:45:36,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:36,715 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2019-11-06 18:45:36,715 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:45:36,715 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2019-11-06 18:45:36,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 18:45:36,716 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:36,716 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:36,928 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:36,928 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:36,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:36,929 INFO L82 PathProgramCache]: Analyzing trace with hash -235287899, now seen corresponding path program 3 times [2019-11-06 18:45:36,929 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:36,930 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759188819] [2019-11-06 18:45:36,930 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:36,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:37,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:37,053 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-06 18:45:37,053 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759188819] [2019-11-06 18:45:37,054 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232041475] [2019-11-06 18:45:37,054 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 [2019-11-06 18:45:37,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:45:37,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:37,107 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:45:37,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:37,223 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-06 18:45:37,224 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:45:37,227 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:37,228 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:45:37,228 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-06 18:45:37,240 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:37,270 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:45:37,271 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:37,271 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2019-11-06 18:45:37,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144118684] [2019-11-06 18:45:37,272 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:45:37,272 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:37,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:45:37,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:45:37,273 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand 15 states. [2019-11-06 18:45:37,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:37,730 INFO L93 Difference]: Finished difference Result 88 states and 108 transitions. [2019-11-06 18:45:37,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:45:37,731 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 30 [2019-11-06 18:45:37,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:37,734 INFO L225 Difference]: With dead ends: 88 [2019-11-06 18:45:37,734 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:45:37,735 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:45:37,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:45:37,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 55. [2019-11-06 18:45:37,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 18:45:37,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2019-11-06 18:45:37,755 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 30 [2019-11-06 18:45:37,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:37,755 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2019-11-06 18:45:37,755 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:45:37,755 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2019-11-06 18:45:37,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:45:37,757 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:37,757 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:37,968 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:37,969 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:37,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:37,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1110475037, now seen corresponding path program 1 times [2019-11-06 18:45:37,971 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:37,971 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578137430] [2019-11-06 18:45:37,972 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:37,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:38,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:38,101 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-06 18:45:38,101 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578137430] [2019-11-06 18:45:38,101 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283887169] [2019-11-06 18:45:38,102 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-06 18:45:38,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:38,160 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:45:38,163 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:38,175 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-06 18:45:38,176 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:38,176 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:45:38,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452135068] [2019-11-06 18:45:38,177 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:45:38,177 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:38,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:45:38,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:45:38,178 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 9 states. [2019-11-06 18:45:38,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:38,314 INFO L93 Difference]: Finished difference Result 108 states and 132 transitions. [2019-11-06 18:45:38,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:45:38,315 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2019-11-06 18:45:38,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:38,321 INFO L225 Difference]: With dead ends: 108 [2019-11-06 18:45:38,322 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 18:45:38,322 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:45:38,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 18:45:38,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 63. [2019-11-06 18:45:38,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 18:45:38,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2019-11-06 18:45:38,344 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 35 [2019-11-06 18:45:38,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:38,345 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2019-11-06 18:45:38,345 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:45:38,345 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2019-11-06 18:45:38,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 18:45:38,348 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:38,348 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:38,558 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:38,558 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:38,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:38,559 INFO L82 PathProgramCache]: Analyzing trace with hash -194968281, now seen corresponding path program 2 times [2019-11-06 18:45:38,559 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:38,559 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924390571] [2019-11-06 18:45:38,559 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:38,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:38,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:38,665 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-06 18:45:38,666 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924390571] [2019-11-06 18:45:38,666 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784013238] [2019-11-06 18:45:38,666 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 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 [2019-11-06 18:45:38,709 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:38,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:38,710 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:45:38,712 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:38,727 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-06 18:45:38,728 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:38,728 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:45:38,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172056542] [2019-11-06 18:45:38,729 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:45:38,729 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:38,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:45:38,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:45:38,730 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 10 states. [2019-11-06 18:45:38,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:38,860 INFO L93 Difference]: Finished difference Result 122 states and 150 transitions. [2019-11-06 18:45:38,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:45:38,861 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2019-11-06 18:45:38,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:38,862 INFO L225 Difference]: With dead ends: 122 [2019-11-06 18:45:38,862 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 18:45:38,863 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:45:38,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 18:45:38,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 71. [2019-11-06 18:45:38,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 18:45:38,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2019-11-06 18:45:38,872 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 40 [2019-11-06 18:45:38,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:38,873 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2019-11-06 18:45:38,873 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:45:38,873 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2019-11-06 18:45:38,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-06 18:45:38,875 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:38,875 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:39,079 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:39,079 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:39,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:39,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1343481249, now seen corresponding path program 3 times [2019-11-06 18:45:39,080 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:39,081 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976923436] [2019-11-06 18:45:39,081 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:39,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:39,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:39,202 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-11-06 18:45:39,202 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976923436] [2019-11-06 18:45:39,203 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923298322] [2019-11-06 18:45:39,203 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 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 [2019-11-06 18:45:39,241 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:45:39,242 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:39,242 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:45:39,245 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:39,400 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:39,401 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 22 [2019-11-06 18:45:39,402 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:39,403 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:45:39,409 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:39,410 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:45:39,410 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:5 [2019-11-06 18:45:39,431 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:39,470 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2019-11-06 18:45:39,470 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:39,471 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2019-11-06 18:45:39,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751539425] [2019-11-06 18:45:39,472 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:45:39,472 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:39,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:45:39,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:45:39,481 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 20 states. [2019-11-06 18:45:40,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:40,714 INFO L93 Difference]: Finished difference Result 148 states and 182 transitions. [2019-11-06 18:45:40,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-11-06 18:45:40,716 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2019-11-06 18:45:40,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:40,719 INFO L225 Difference]: With dead ends: 148 [2019-11-06 18:45:40,720 INFO L226 Difference]: Without dead ends: 96 [2019-11-06 18:45:40,722 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=617, Invalid=2353, Unknown=0, NotChecked=0, Total=2970 [2019-11-06 18:45:40,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-11-06 18:45:40,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 61. [2019-11-06 18:45:40,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 18:45:40,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2019-11-06 18:45:40,733 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 45 [2019-11-06 18:45:40,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:40,733 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2019-11-06 18:45:40,733 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:45:40,734 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2019-11-06 18:45:40,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-06 18:45:40,735 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:40,735 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:40,938 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:40,939 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:40,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:40,939 INFO L82 PathProgramCache]: Analyzing trace with hash -1086899484, now seen corresponding path program 1 times [2019-11-06 18:45:40,940 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:40,940 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885996254] [2019-11-06 18:45:40,940 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:40,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,059 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-11-06 18:45:41,059 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885996254] [2019-11-06 18:45:41,060 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883254216] [2019-11-06 18:45:41,060 INFO L94 rtionOrderModulation]: Keeping assertion order 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 [2019-11-06 18:45:41,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,125 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:45:41,128 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:41,152 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2019-11-06 18:45:41,152 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:41,152 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:45:41,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940988881] [2019-11-06 18:45:41,153 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:45:41,153 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:41,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:45:41,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:45:41,154 INFO L87 Difference]: Start difference. First operand 61 states and 70 transitions. Second operand 12 states. [2019-11-06 18:45:41,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:41,274 INFO L93 Difference]: Finished difference Result 109 states and 130 transitions. [2019-11-06 18:45:41,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:45:41,274 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 58 [2019-11-06 18:45:41,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:41,275 INFO L225 Difference]: With dead ends: 109 [2019-11-06 18:45:41,276 INFO L226 Difference]: Without dead ends: 69 [2019-11-06 18:45:41,278 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:45:41,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-11-06 18:45:41,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2019-11-06 18:45:41,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-06 18:45:41,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2019-11-06 18:45:41,287 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 58 [2019-11-06 18:45:41,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:41,287 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2019-11-06 18:45:41,287 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:45:41,288 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2019-11-06 18:45:41,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 18:45:41,289 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:41,289 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:41,492 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:41,493 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:41,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:41,493 INFO L82 PathProgramCache]: Analyzing trace with hash -957205740, now seen corresponding path program 2 times [2019-11-06 18:45:41,494 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:41,494 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093588860] [2019-11-06 18:45:41,494 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:41,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:41,640 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2019-11-06 18:45:41,640 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093588860] [2019-11-06 18:45:41,640 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882249850] [2019-11-06 18:45:41,640 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 [2019-11-06 18:45:41,696 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:41,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:41,697 INFO L256 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:45:41,700 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:41,724 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2019-11-06 18:45:41,724 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:41,725 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:45:41,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456246443] [2019-11-06 18:45:41,726 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:45:41,726 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:41,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:45:41,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:45:41,727 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand 13 states. [2019-11-06 18:45:41,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:41,893 INFO L93 Difference]: Finished difference Result 117 states and 140 transitions. [2019-11-06 18:45:41,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:45:41,894 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 63 [2019-11-06 18:45:41,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:41,895 INFO L225 Difference]: With dead ends: 117 [2019-11-06 18:45:41,895 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 18:45:41,896 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:45:41,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 18:45:41,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2019-11-06 18:45:41,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 18:45:41,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 82 transitions. [2019-11-06 18:45:41,918 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 82 transitions. Word has length 63 [2019-11-06 18:45:41,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:41,918 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 82 transitions. [2019-11-06 18:45:41,918 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:45:41,918 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 82 transitions. [2019-11-06 18:45:41,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-06 18:45:41,922 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:41,922 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:42,127 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:42,128 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:42,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:42,129 INFO L82 PathProgramCache]: Analyzing trace with hash 995106664, now seen corresponding path program 3 times [2019-11-06 18:45:42,129 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:42,130 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455845396] [2019-11-06 18:45:42,130 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:42,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:42,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:42,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:42,310 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-11-06 18:45:42,310 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455845396] [2019-11-06 18:45:42,310 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083211680] [2019-11-06 18:45:42,311 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 [2019-11-06 18:45:42,374 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:45:42,374 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:42,375 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:45:42,381 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:42,527 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-06 18:45:42,530 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:45:42,532 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:42,532 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:45:42,532 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-06 18:45:42,550 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:42,590 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 1 proven. 43 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2019-11-06 18:45:42,591 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:42,591 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 25 [2019-11-06 18:45:42,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262545986] [2019-11-06 18:45:42,591 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:45:42,592 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:42,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:45:42,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:45:42,593 INFO L87 Difference]: Start difference. First operand 71 states and 82 transitions. Second operand 25 states. [2019-11-06 18:45:43,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:43,587 INFO L93 Difference]: Finished difference Result 167 states and 205 transitions. [2019-11-06 18:45:43,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 18:45:43,588 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 68 [2019-11-06 18:45:43,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:43,590 INFO L225 Difference]: With dead ends: 167 [2019-11-06 18:45:43,590 INFO L226 Difference]: Without dead ends: 121 [2019-11-06 18:45:43,592 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=459, Invalid=2091, Unknown=0, NotChecked=0, Total=2550 [2019-11-06 18:45:43,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2019-11-06 18:45:43,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 110. [2019-11-06 18:45:43,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2019-11-06 18:45:43,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 131 transitions. [2019-11-06 18:45:43,605 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 131 transitions. Word has length 68 [2019-11-06 18:45:43,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:43,605 INFO L462 AbstractCegarLoop]: Abstraction has 110 states and 131 transitions. [2019-11-06 18:45:43,605 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:45:43,606 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 131 transitions. [2019-11-06 18:45:43,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-06 18:45:43,608 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:43,608 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:43,819 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:43,820 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:43,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:43,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1767766386, now seen corresponding path program 1 times [2019-11-06 18:45:43,821 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:43,821 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68086500] [2019-11-06 18:45:43,822 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:43,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,966 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2019-11-06 18:45:43,966 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68086500] [2019-11-06 18:45:43,967 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483018422] [2019-11-06 18:45:43,967 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-06 18:45:44,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,019 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:45:44,021 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:44,039 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2019-11-06 18:45:44,040 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:44,040 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:45:44,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213174984] [2019-11-06 18:45:44,041 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:45:44,041 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:44,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:45:44,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:45:44,042 INFO L87 Difference]: Start difference. First operand 110 states and 131 transitions. Second operand 15 states. [2019-11-06 18:45:44,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:44,200 INFO L93 Difference]: Finished difference Result 206 states and 254 transitions. [2019-11-06 18:45:44,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:45:44,201 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2019-11-06 18:45:44,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:44,202 INFO L225 Difference]: With dead ends: 206 [2019-11-06 18:45:44,203 INFO L226 Difference]: Without dead ends: 123 [2019-11-06 18:45:44,204 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:45:44,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2019-11-06 18:45:44,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 118. [2019-11-06 18:45:44,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-11-06 18:45:44,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 141 transitions. [2019-11-06 18:45:44,216 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 141 transitions. Word has length 73 [2019-11-06 18:45:44,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:44,216 INFO L462 AbstractCegarLoop]: Abstraction has 118 states and 141 transitions. [2019-11-06 18:45:44,216 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:45:44,216 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 141 transitions. [2019-11-06 18:45:44,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-06 18:45:44,218 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:44,218 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:44,423 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:44,423 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:44,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:44,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1854631914, now seen corresponding path program 2 times [2019-11-06 18:45:44,424 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:44,424 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040340665] [2019-11-06 18:45:44,424 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:44,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,572 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2019-11-06 18:45:44,572 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040340665] [2019-11-06 18:45:44,572 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958792369] [2019-11-06 18:45:44,572 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 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 [2019-11-06 18:45:44,632 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:44,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:44,633 INFO L256 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:45:44,634 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:44,651 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2019-11-06 18:45:44,652 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:44,652 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:45:44,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210253531] [2019-11-06 18:45:44,653 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:45:44,653 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:44,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:45:44,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:45:44,654 INFO L87 Difference]: Start difference. First operand 118 states and 141 transitions. Second operand 16 states. [2019-11-06 18:45:44,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:44,815 INFO L93 Difference]: Finished difference Result 220 states and 272 transitions. [2019-11-06 18:45:44,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:45:44,815 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2019-11-06 18:45:44,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:44,817 INFO L225 Difference]: With dead ends: 220 [2019-11-06 18:45:44,817 INFO L226 Difference]: Without dead ends: 131 [2019-11-06 18:45:44,819 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:45:44,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2019-11-06 18:45:44,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 126. [2019-11-06 18:45:44,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2019-11-06 18:45:44,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 151 transitions. [2019-11-06 18:45:44,830 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 151 transitions. Word has length 78 [2019-11-06 18:45:44,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:44,830 INFO L462 AbstractCegarLoop]: Abstraction has 126 states and 151 transitions. [2019-11-06 18:45:44,830 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:45:44,830 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 151 transitions. [2019-11-06 18:45:44,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-06 18:45:44,832 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:44,832 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:45,035 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:45,036 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:45,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:45,036 INFO L82 PathProgramCache]: Analyzing trace with hash -2005840374, now seen corresponding path program 3 times [2019-11-06 18:45:45,036 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:45,036 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25456826] [2019-11-06 18:45:45,036 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:45,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,206 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2019-11-06 18:45:45,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25456826] [2019-11-06 18:45:45,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17514746] [2019-11-06 18:45:45,207 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 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 [2019-11-06 18:45:45,294 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:45:45,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:45,296 INFO L256 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:45:45,300 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:45,735 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:45,736 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 22 [2019-11-06 18:45:45,736 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:45,738 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:45:45,744 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:45,745 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:45:45,745 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:5 [2019-11-06 18:45:45,768 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:45,842 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 29 proven. 59 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2019-11-06 18:45:45,842 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:45,843 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 31 [2019-11-06 18:45:45,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623915536] [2019-11-06 18:45:45,844 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:45:45,844 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:45,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:45:45,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=749, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:45:45,845 INFO L87 Difference]: Start difference. First operand 126 states and 151 transitions. Second operand 31 states. [2019-11-06 18:45:48,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:48,544 INFO L93 Difference]: Finished difference Result 258 states and 314 transitions. [2019-11-06 18:45:48,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-11-06 18:45:48,545 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 83 [2019-11-06 18:45:48,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:48,548 INFO L225 Difference]: With dead ends: 258 [2019-11-06 18:45:48,548 INFO L226 Difference]: Without dead ends: 163 [2019-11-06 18:45:48,551 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2694 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1734, Invalid=7008, Unknown=0, NotChecked=0, Total=8742 [2019-11-06 18:45:48,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2019-11-06 18:45:48,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 99. [2019-11-06 18:45:48,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-11-06 18:45:48,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 114 transitions. [2019-11-06 18:45:48,561 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 114 transitions. Word has length 83 [2019-11-06 18:45:48,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:48,561 INFO L462 AbstractCegarLoop]: Abstraction has 99 states and 114 transitions. [2019-11-06 18:45:48,561 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:45:48,561 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 114 transitions. [2019-11-06 18:45:48,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-11-06 18:45:48,563 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:48,563 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:48,766 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:48,766 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:48,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:48,767 INFO L82 PathProgramCache]: Analyzing trace with hash 343721127, now seen corresponding path program 4 times [2019-11-06 18:45:48,767 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:48,767 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983729581] [2019-11-06 18:45:48,768 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:48,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:48,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:48,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:48,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:48,959 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 4 proven. 169 refuted. 0 times theorem prover too weak. 259 trivial. 0 not checked. [2019-11-06 18:45:48,960 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983729581] [2019-11-06 18:45:48,960 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828963289] [2019-11-06 18:45:48,960 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 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 [2019-11-06 18:45:49,035 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:45:49,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:49,037 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:45:49,038 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:49,084 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2019-11-06 18:45:49,084 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:49,085 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:45:49,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585217992] [2019-11-06 18:45:49,085 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:45:49,086 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:49,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:45:49,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:45:49,086 INFO L87 Difference]: Start difference. First operand 99 states and 114 transitions. Second operand 18 states. [2019-11-06 18:45:49,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:49,282 INFO L93 Difference]: Finished difference Result 173 states and 206 transitions. [2019-11-06 18:45:49,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:45:49,283 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2019-11-06 18:45:49,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:49,284 INFO L225 Difference]: With dead ends: 173 [2019-11-06 18:45:49,285 INFO L226 Difference]: Without dead ends: 107 [2019-11-06 18:45:49,286 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:45:49,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-11-06 18:45:49,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 104. [2019-11-06 18:45:49,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-06 18:45:49,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 120 transitions. [2019-11-06 18:45:49,300 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 120 transitions. Word has length 96 [2019-11-06 18:45:49,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:49,301 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 120 transitions. [2019-11-06 18:45:49,301 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:45:49,301 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 120 transitions. [2019-11-06 18:45:49,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2019-11-06 18:45:49,302 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:49,303 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:49,506 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:49,507 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:49,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:49,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1246669377, now seen corresponding path program 5 times [2019-11-06 18:45:49,508 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:49,508 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743082265] [2019-11-06 18:45:49,508 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:49,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:49,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:49,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:49,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:49,746 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 4 proven. 196 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2019-11-06 18:45:49,748 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743082265] [2019-11-06 18:45:49,748 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298867636] [2019-11-06 18:45:49,748 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 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 [2019-11-06 18:45:50,026 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2019-11-06 18:45:50,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:50,028 INFO L256 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:45:50,030 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:50,048 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 303 trivial. 0 not checked. [2019-11-06 18:45:50,049 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:50,049 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:45:50,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414951410] [2019-11-06 18:45:50,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:45:50,050 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:50,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:45:50,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:45:50,050 INFO L87 Difference]: Start difference. First operand 104 states and 120 transitions. Second operand 19 states. [2019-11-06 18:45:50,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:50,233 INFO L93 Difference]: Finished difference Result 181 states and 216 transitions. [2019-11-06 18:45:50,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:45:50,234 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2019-11-06 18:45:50,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:50,236 INFO L225 Difference]: With dead ends: 181 [2019-11-06 18:45:50,236 INFO L226 Difference]: Without dead ends: 112 [2019-11-06 18:45:50,237 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:45:50,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2019-11-06 18:45:50,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 109. [2019-11-06 18:45:50,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-11-06 18:45:50,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 126 transitions. [2019-11-06 18:45:50,247 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 126 transitions. Word has length 101 [2019-11-06 18:45:50,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:50,248 INFO L462 AbstractCegarLoop]: Abstraction has 109 states and 126 transitions. [2019-11-06 18:45:50,248 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:45:50,248 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 126 transitions. [2019-11-06 18:45:50,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-11-06 18:45:50,249 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:50,249 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:50,454 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:50,454 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:50,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:50,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1730536149, now seen corresponding path program 6 times [2019-11-06 18:45:50,455 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:50,455 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964911381] [2019-11-06 18:45:50,455 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:50,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:50,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:50,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:50,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:50,678 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 4 proven. 225 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2019-11-06 18:45:50,679 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964911381] [2019-11-06 18:45:50,679 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723902778] [2019-11-06 18:45:50,679 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 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 [2019-11-06 18:45:50,991 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2019-11-06 18:45:50,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:50,993 INFO L256 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 18:45:50,995 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:51,010 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 241 trivial. 0 not checked. [2019-11-06 18:45:51,011 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:51,011 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:45:51,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823253124] [2019-11-06 18:45:51,011 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:45:51,012 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:51,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:45:51,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:45:51,012 INFO L87 Difference]: Start difference. First operand 109 states and 126 transitions. Second operand 20 states. [2019-11-06 18:45:51,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:51,207 INFO L93 Difference]: Finished difference Result 189 states and 226 transitions. [2019-11-06 18:45:51,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:45:51,208 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 106 [2019-11-06 18:45:51,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:51,209 INFO L225 Difference]: With dead ends: 189 [2019-11-06 18:45:51,209 INFO L226 Difference]: Without dead ends: 117 [2019-11-06 18:45:51,209 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:45:51,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-11-06 18:45:51,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2019-11-06 18:45:51,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2019-11-06 18:45:51,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 132 transitions. [2019-11-06 18:45:51,217 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 132 transitions. Word has length 106 [2019-11-06 18:45:51,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:51,218 INFO L462 AbstractCegarLoop]: Abstraction has 114 states and 132 transitions. [2019-11-06 18:45:51,218 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:45:51,218 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 132 transitions. [2019-11-06 18:45:51,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-11-06 18:45:51,219 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:51,219 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:51,423 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:51,423 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:51,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:51,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1419636421, now seen corresponding path program 7 times [2019-11-06 18:45:51,424 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:51,424 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062071003] [2019-11-06 18:45:51,424 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:51,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,627 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 4 proven. 256 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2019-11-06 18:45:51,627 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062071003] [2019-11-06 18:45:51,627 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587649875] [2019-11-06 18:45:51,628 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 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 [2019-11-06 18:45:51,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,714 INFO L256 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:45:51,716 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:51,773 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-11-06 18:45:51,773 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:51,774 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:45:51,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231080809] [2019-11-06 18:45:51,775 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:45:51,776 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:51,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:45:51,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:45:51,778 INFO L87 Difference]: Start difference. First operand 114 states and 132 transitions. Second operand 21 states. [2019-11-06 18:45:52,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:52,038 INFO L93 Difference]: Finished difference Result 197 states and 236 transitions. [2019-11-06 18:45:52,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:45:52,039 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 111 [2019-11-06 18:45:52,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:52,040 INFO L225 Difference]: With dead ends: 197 [2019-11-06 18:45:52,040 INFO L226 Difference]: Without dead ends: 122 [2019-11-06 18:45:52,042 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:45:52,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-11-06 18:45:52,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 119. [2019-11-06 18:45:52,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-11-06 18:45:52,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 138 transitions. [2019-11-06 18:45:52,050 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 138 transitions. Word has length 111 [2019-11-06 18:45:52,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:52,051 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 138 transitions. [2019-11-06 18:45:52,051 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:45:52,051 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 138 transitions. [2019-11-06 18:45:52,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-11-06 18:45:52,052 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:52,052 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:52,252 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:52,253 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:52,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:52,253 INFO L82 PathProgramCache]: Analyzing trace with hash 263871919, now seen corresponding path program 8 times [2019-11-06 18:45:52,253 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:52,253 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117626647] [2019-11-06 18:45:52,254 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:52,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:52,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:52,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:52,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:52,505 INFO L134 CoverageAnalysis]: Checked inductivity of 730 backedges. 4 proven. 289 refuted. 0 times theorem prover too weak. 437 trivial. 0 not checked. [2019-11-06 18:45:52,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117626647] [2019-11-06 18:45:52,506 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444912278] [2019-11-06 18:45:52,506 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 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 [2019-11-06 18:45:52,623 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:52,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:52,625 INFO L256 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:45:52,628 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:52,649 INFO L134 CoverageAnalysis]: Checked inductivity of 730 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-06 18:45:52,649 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:52,649 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:45:52,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513953060] [2019-11-06 18:45:52,651 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:45:52,651 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:52,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:45:52,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:45:52,652 INFO L87 Difference]: Start difference. First operand 119 states and 138 transitions. Second operand 22 states. [2019-11-06 18:45:52,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:52,874 INFO L93 Difference]: Finished difference Result 205 states and 246 transitions. [2019-11-06 18:45:52,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:45:52,874 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 116 [2019-11-06 18:45:52,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:52,876 INFO L225 Difference]: With dead ends: 205 [2019-11-06 18:45:52,876 INFO L226 Difference]: Without dead ends: 127 [2019-11-06 18:45:52,876 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:45:52,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-11-06 18:45:52,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 124. [2019-11-06 18:45:52,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-11-06 18:45:52,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 144 transitions. [2019-11-06 18:45:52,885 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 144 transitions. Word has length 116 [2019-11-06 18:45:52,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:52,885 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 144 transitions. [2019-11-06 18:45:52,885 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:45:52,885 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 144 transitions. [2019-11-06 18:45:52,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2019-11-06 18:45:52,886 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:52,886 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:53,087 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:53,087 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:53,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:53,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1047643319, now seen corresponding path program 9 times [2019-11-06 18:45:53,088 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:53,088 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467809909] [2019-11-06 18:45:53,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:53,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:53,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:53,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:53,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:53,347 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 4 proven. 324 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2019-11-06 18:45:53,347 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467809909] [2019-11-06 18:45:53,347 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896942390] [2019-11-06 18:45:53,347 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 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 [2019-11-06 18:45:53,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:45:53,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:53,448 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:45:53,450 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:53,658 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-06 18:45:53,658 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:45:53,660 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:53,660 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:45:53,661 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-06 18:45:53,685 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:53,768 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 6 proven. 141 refuted. 0 times theorem prover too weak. 670 trivial. 0 not checked. [2019-11-06 18:45:53,768 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:53,768 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 16] total 36 [2019-11-06 18:45:53,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663216220] [2019-11-06 18:45:53,769 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 18:45:53,769 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:53,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 18:45:53,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=954, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:45:53,770 INFO L87 Difference]: Start difference. First operand 124 states and 144 transitions. Second operand 36 states. [2019-11-06 18:45:55,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:55,544 INFO L93 Difference]: Finished difference Result 283 states and 348 transitions. [2019-11-06 18:45:55,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-11-06 18:45:55,545 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 121 [2019-11-06 18:45:55,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:55,546 INFO L225 Difference]: With dead ends: 283 [2019-11-06 18:45:55,547 INFO L226 Difference]: Without dead ends: 202 [2019-11-06 18:45:55,549 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1466 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1265, Invalid=4897, Unknown=0, NotChecked=0, Total=6162 [2019-11-06 18:45:55,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2019-11-06 18:45:55,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 191. [2019-11-06 18:45:55,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2019-11-06 18:45:55,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 230 transitions. [2019-11-06 18:45:55,562 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 230 transitions. Word has length 121 [2019-11-06 18:45:55,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:55,563 INFO L462 AbstractCegarLoop]: Abstraction has 191 states and 230 transitions. [2019-11-06 18:45:55,563 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 18:45:55,563 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 230 transitions. [2019-11-06 18:45:55,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-11-06 18:45:55,564 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:55,564 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:55,767 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:55,768 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:55,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:55,768 INFO L82 PathProgramCache]: Analyzing trace with hash -688313295, now seen corresponding path program 4 times [2019-11-06 18:45:55,769 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:55,769 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118715558] [2019-11-06 18:45:55,769 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:55,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,037 INFO L134 CoverageAnalysis]: Checked inductivity of 909 backedges. 4 proven. 361 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2019-11-06 18:45:56,038 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118715558] [2019-11-06 18:45:56,041 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044746483] [2019-11-06 18:45:56,041 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:56,179 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:45:56,179 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:56,181 INFO L256 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:45:56,185 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:56,225 INFO L134 CoverageAnalysis]: Checked inductivity of 909 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 548 trivial. 0 not checked. [2019-11-06 18:45:56,226 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:56,226 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:45:56,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838926763] [2019-11-06 18:45:56,227 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:45:56,227 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:56,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:45:56,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:45:56,228 INFO L87 Difference]: Start difference. First operand 191 states and 230 transitions. Second operand 24 states. [2019-11-06 18:45:56,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:56,507 INFO L93 Difference]: Finished difference Result 350 states and 434 transitions. [2019-11-06 18:45:56,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:45:56,508 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 126 [2019-11-06 18:45:56,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:56,509 INFO L225 Difference]: With dead ends: 350 [2019-11-06 18:45:56,509 INFO L226 Difference]: Without dead ends: 204 [2019-11-06 18:45:56,511 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:45:56,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2019-11-06 18:45:56,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 199. [2019-11-06 18:45:56,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2019-11-06 18:45:56,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 240 transitions. [2019-11-06 18:45:56,526 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 240 transitions. Word has length 126 [2019-11-06 18:45:56,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:56,526 INFO L462 AbstractCegarLoop]: Abstraction has 199 states and 240 transitions. [2019-11-06 18:45:56,526 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:45:56,526 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 240 transitions. [2019-11-06 18:45:56,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-11-06 18:45:56,527 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:56,528 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:56,732 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:56,732 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:56,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:56,732 INFO L82 PathProgramCache]: Analyzing trace with hash 868455985, now seen corresponding path program 5 times [2019-11-06 18:45:56,733 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:56,733 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279629898] [2019-11-06 18:45:56,733 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:56,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:57,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:57,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1006 backedges. 4 proven. 400 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2019-11-06 18:45:57,011 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279629898] [2019-11-06 18:45:57,011 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862896477] [2019-11-06 18:45:57,011 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:57,890 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-11-06 18:45:57,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:57,894 INFO L256 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 18:45:57,896 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:57,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1006 backedges. 0 proven. 590 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2019-11-06 18:45:57,928 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:57,929 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 18:45:57,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497715967] [2019-11-06 18:45:57,929 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:45:57,929 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:57,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:45:57,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:45:57,930 INFO L87 Difference]: Start difference. First operand 199 states and 240 transitions. Second operand 25 states. [2019-11-06 18:45:58,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:58,161 INFO L93 Difference]: Finished difference Result 364 states and 452 transitions. [2019-11-06 18:45:58,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:45:58,162 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 131 [2019-11-06 18:45:58,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:58,164 INFO L225 Difference]: With dead ends: 364 [2019-11-06 18:45:58,164 INFO L226 Difference]: Without dead ends: 212 [2019-11-06 18:45:58,165 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:45:58,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-11-06 18:45:58,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 207. [2019-11-06 18:45:58,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2019-11-06 18:45:58,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 250 transitions. [2019-11-06 18:45:58,180 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 250 transitions. Word has length 131 [2019-11-06 18:45:58,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:58,180 INFO L462 AbstractCegarLoop]: Abstraction has 207 states and 250 transitions. [2019-11-06 18:45:58,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:45:58,181 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 250 transitions. [2019-11-06 18:45:58,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2019-11-06 18:45:58,182 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:58,182 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:58,389 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:58,389 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:58,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:58,390 INFO L82 PathProgramCache]: Analyzing trace with hash -7078731, now seen corresponding path program 6 times [2019-11-06 18:45:58,390 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:58,390 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897794968] [2019-11-06 18:45:58,391 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:58,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:58,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:58,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:58,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:58,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 4 proven. 441 refuted. 0 times theorem prover too weak. 663 trivial. 0 not checked. [2019-11-06 18:45:58,750 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897794968] [2019-11-06 18:45:58,750 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665647745] [2019-11-06 18:45:58,750 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 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 [2019-11-06 18:45:59,158 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2019-11-06 18:45:59,158 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:59,161 INFO L256 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 18:45:59,163 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:59,622 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:59,622 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 22 [2019-11-06 18:45:59,623 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:59,623 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:45:59,627 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:45:59,627 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:45:59,627 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:5 [2019-11-06 18:45:59,647 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:45:59,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 56 proven. 168 refuted. 0 times theorem prover too weak. 884 trivial. 0 not checked. [2019-11-06 18:45:59,726 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:59,727 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 19] total 42 [2019-11-06 18:45:59,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271797279] [2019-11-06 18:45:59,727 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-11-06 18:45:59,727 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:59,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-11-06 18:45:59,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1323, Unknown=0, NotChecked=0, Total=1722 [2019-11-06 18:45:59,729 INFO L87 Difference]: Start difference. First operand 207 states and 250 transitions. Second operand 42 states. [2019-11-06 18:46:04,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:04,950 INFO L93 Difference]: Finished difference Result 406 states and 497 transitions. [2019-11-06 18:46:04,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2019-11-06 18:46:04,951 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 136 [2019-11-06 18:46:04,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:04,953 INFO L225 Difference]: With dead ends: 406 [2019-11-06 18:46:04,953 INFO L226 Difference]: Without dead ends: 248 [2019-11-06 18:46:04,958 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7136 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4503, Invalid=16377, Unknown=0, NotChecked=0, Total=20880 [2019-11-06 18:46:04,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2019-11-06 18:46:04,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 152. [2019-11-06 18:46:04,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2019-11-06 18:46:04,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 176 transitions. [2019-11-06 18:46:04,969 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 176 transitions. Word has length 136 [2019-11-06 18:46:04,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:04,970 INFO L462 AbstractCegarLoop]: Abstraction has 152 states and 176 transitions. [2019-11-06 18:46:04,970 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-11-06 18:46:04,970 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 176 transitions. [2019-11-06 18:46:04,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2019-11-06 18:46:04,971 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:04,971 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:05,175 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:05,175 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:05,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:05,176 INFO L82 PathProgramCache]: Analyzing trace with hash -74610458, now seen corresponding path program 10 times [2019-11-06 18:46:05,176 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:05,176 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877371958] [2019-11-06 18:46:05,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:05,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:05,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:05,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:05,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:05,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:05,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 6 proven. 715 refuted. 0 times theorem prover too weak. 514 trivial. 0 not checked. [2019-11-06 18:46:05,535 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877371958] [2019-11-06 18:46:05,535 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408094681] [2019-11-06 18:46:05,535 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 [2019-11-06 18:46:05,643 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:46:05,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:05,645 INFO L256 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:46:05,647 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:05,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 751 trivial. 0 not checked. [2019-11-06 18:46:05,688 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:05,688 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 18:46:05,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964112004] [2019-11-06 18:46:05,690 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:46:05,690 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:05,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:46:05,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:46:05,691 INFO L87 Difference]: Start difference. First operand 152 states and 176 transitions. Second operand 27 states. [2019-11-06 18:46:06,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:06,020 INFO L93 Difference]: Finished difference Result 261 states and 312 transitions. [2019-11-06 18:46:06,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 18:46:06,021 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 149 [2019-11-06 18:46:06,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:06,022 INFO L225 Difference]: With dead ends: 261 [2019-11-06 18:46:06,022 INFO L226 Difference]: Without dead ends: 160 [2019-11-06 18:46:06,023 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:46:06,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2019-11-06 18:46:06,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 157. [2019-11-06 18:46:06,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-11-06 18:46:06,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 182 transitions. [2019-11-06 18:46:06,035 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 182 transitions. Word has length 149 [2019-11-06 18:46:06,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:06,035 INFO L462 AbstractCegarLoop]: Abstraction has 157 states and 182 transitions. [2019-11-06 18:46:06,035 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:46:06,036 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 182 transitions. [2019-11-06 18:46:06,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2019-11-06 18:46:06,036 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:06,037 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:06,240 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:06,240 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:06,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:06,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1658402930, now seen corresponding path program 11 times [2019-11-06 18:46:06,241 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:06,241 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779962472] [2019-11-06 18:46:06,241 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:06,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:06,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:06,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:06,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:06,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:06,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 6 proven. 782 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2019-11-06 18:46:06,566 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779962472] [2019-11-06 18:46:06,566 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1033149682] [2019-11-06 18:46:06,566 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 [2019-11-06 18:46:07,290 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-11-06 18:46:07,291 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:07,294 INFO L256 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 18:46:07,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:07,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 818 trivial. 0 not checked. [2019-11-06 18:46:07,319 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:07,319 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-11-06 18:46:07,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808849604] [2019-11-06 18:46:07,320 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 18:46:07,320 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:07,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 18:46:07,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:46:07,321 INFO L87 Difference]: Start difference. First operand 157 states and 182 transitions. Second operand 28 states. [2019-11-06 18:46:07,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:07,591 INFO L93 Difference]: Finished difference Result 269 states and 322 transitions. [2019-11-06 18:46:07,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:46:07,592 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 154 [2019-11-06 18:46:07,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:07,594 INFO L225 Difference]: With dead ends: 269 [2019-11-06 18:46:07,594 INFO L226 Difference]: Without dead ends: 165 [2019-11-06 18:46:07,595 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:46:07,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-11-06 18:46:07,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 162. [2019-11-06 18:46:07,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2019-11-06 18:46:07,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 188 transitions. [2019-11-06 18:46:07,606 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 188 transitions. Word has length 154 [2019-11-06 18:46:07,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:07,606 INFO L462 AbstractCegarLoop]: Abstraction has 162 states and 188 transitions. [2019-11-06 18:46:07,606 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 18:46:07,606 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 188 transitions. [2019-11-06 18:46:07,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-11-06 18:46:07,607 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:07,607 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:07,813 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:07,813 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:07,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:07,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1479239778, now seen corresponding path program 12 times [2019-11-06 18:46:07,814 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:07,815 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651037511] [2019-11-06 18:46:07,815 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:07,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:08,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:08,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:08,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:08,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:08,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1464 backedges. 6 proven. 852 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2019-11-06 18:46:08,177 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651037511] [2019-11-06 18:46:08,177 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085945585] [2019-11-06 18:46:08,177 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 [2019-11-06 18:46:09,114 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2019-11-06 18:46:09,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:09,117 INFO L256 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 18:46:09,120 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:09,511 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-06 18:46:09,512 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:46:09,514 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:46:09,515 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:46:09,515 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-06 18:46:09,547 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:46:09,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1464 backedges. 11 proven. 261 refuted. 0 times theorem prover too weak. 1192 trivial. 0 not checked. [2019-11-06 18:46:09,728 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:09,728 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 18] total 44 [2019-11-06 18:46:09,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336069604] [2019-11-06 18:46:09,729 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-11-06 18:46:09,729 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:09,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-11-06 18:46:09,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=1398, Unknown=0, NotChecked=0, Total=1892 [2019-11-06 18:46:09,731 INFO L87 Difference]: Start difference. First operand 162 states and 188 transitions. Second operand 44 states. [2019-11-06 18:46:12,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:12,368 INFO L93 Difference]: Finished difference Result 366 states and 449 transitions. [2019-11-06 18:46:12,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-11-06 18:46:12,368 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 159 [2019-11-06 18:46:12,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:12,370 INFO L225 Difference]: With dead ends: 366 [2019-11-06 18:46:12,371 INFO L226 Difference]: Without dead ends: 259 [2019-11-06 18:46:12,373 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2317 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2022, Invalid=7484, Unknown=0, NotChecked=0, Total=9506 [2019-11-06 18:46:12,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2019-11-06 18:46:12,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 248. [2019-11-06 18:46:12,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2019-11-06 18:46:12,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 299 transitions. [2019-11-06 18:46:12,391 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 299 transitions. Word has length 159 [2019-11-06 18:46:12,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:12,391 INFO L462 AbstractCegarLoop]: Abstraction has 248 states and 299 transitions. [2019-11-06 18:46:12,391 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-11-06 18:46:12,391 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 299 transitions. [2019-11-06 18:46:12,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-11-06 18:46:12,393 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:12,393 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:12,598 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:12,598 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:12,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:12,599 INFO L82 PathProgramCache]: Analyzing trace with hash 895048948, now seen corresponding path program 7 times [2019-11-06 18:46:12,600 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:12,600 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18460187] [2019-11-06 18:46:12,600 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:12,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:12,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:12,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:12,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:12,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:12,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1586 backedges. 6 proven. 925 refuted. 0 times theorem prover too weak. 655 trivial. 0 not checked. [2019-11-06 18:46:12,990 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18460187] [2019-11-06 18:46:12,991 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092812904] [2019-11-06 18:46:12,991 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 [2019-11-06 18:46:13,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:13,111 INFO L256 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:46:13,113 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:13,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1586 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 961 trivial. 0 not checked. [2019-11-06 18:46:13,145 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:13,145 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 18:46:13,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157923860] [2019-11-06 18:46:13,146 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:46:13,146 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:13,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:46:13,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:46:13,147 INFO L87 Difference]: Start difference. First operand 248 states and 299 transitions. Second operand 30 states. [2019-11-06 18:46:13,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:13,377 INFO L93 Difference]: Finished difference Result 452 states and 560 transitions. [2019-11-06 18:46:13,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:46:13,377 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 164 [2019-11-06 18:46:13,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:13,379 INFO L225 Difference]: With dead ends: 452 [2019-11-06 18:46:13,379 INFO L226 Difference]: Without dead ends: 261 [2019-11-06 18:46:13,380 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:46:13,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2019-11-06 18:46:13,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 256. [2019-11-06 18:46:13,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2019-11-06 18:46:13,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 309 transitions. [2019-11-06 18:46:13,407 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 309 transitions. Word has length 164 [2019-11-06 18:46:13,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:13,408 INFO L462 AbstractCegarLoop]: Abstraction has 256 states and 309 transitions. [2019-11-06 18:46:13,408 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:46:13,408 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 309 transitions. [2019-11-06 18:46:13,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2019-11-06 18:46:13,409 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:13,410 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:13,613 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:13,613 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:13,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:13,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1645201372, now seen corresponding path program 8 times [2019-11-06 18:46:13,614 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:13,616 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568844014] [2019-11-06 18:46:13,616 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:13,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:14,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:14,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:14,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:14,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:14,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 6 proven. 676 refuted. 0 times theorem prover too weak. 1031 trivial. 0 not checked. [2019-11-06 18:46:14,079 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568844014] [2019-11-06 18:46:14,079 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188647035] [2019-11-06 18:46:14,079 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 [2019-11-06 18:46:14,199 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:46:14,199 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:14,201 INFO L256 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:46:14,203 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:14,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1037 trivial. 0 not checked. [2019-11-06 18:46:14,247 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:14,247 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 18:46:14,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954328670] [2019-11-06 18:46:14,248 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:46:14,248 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:14,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:46:14,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:46:14,249 INFO L87 Difference]: Start difference. First operand 256 states and 309 transitions. Second operand 31 states. [2019-11-06 18:46:14,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:14,623 INFO L93 Difference]: Finished difference Result 466 states and 578 transitions. [2019-11-06 18:46:14,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:46:14,623 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 169 [2019-11-06 18:46:14,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:14,628 INFO L225 Difference]: With dead ends: 466 [2019-11-06 18:46:14,628 INFO L226 Difference]: Without dead ends: 269 [2019-11-06 18:46:14,629 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:46:14,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2019-11-06 18:46:14,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 264. [2019-11-06 18:46:14,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2019-11-06 18:46:14,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 319 transitions. [2019-11-06 18:46:14,650 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 319 transitions. Word has length 169 [2019-11-06 18:46:14,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:14,651 INFO L462 AbstractCegarLoop]: Abstraction has 264 states and 319 transitions. [2019-11-06 18:46:14,651 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:46:14,651 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 319 transitions. [2019-11-06 18:46:14,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-11-06 18:46:14,652 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:14,653 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:14,857 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:14,857 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:14,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:14,858 INFO L82 PathProgramCache]: Analyzing trace with hash 579936632, now seen corresponding path program 9 times [2019-11-06 18:46:14,858 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:14,858 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556165322] [2019-11-06 18:46:14,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:14,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat