/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_two_index_01.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:47:12,845 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:47:12,848 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:47:12,867 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:47:12,867 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:47:12,869 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:47:12,871 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:47:12,880 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:47:12,884 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:47:12,887 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:47:12,889 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:47:12,891 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:47:12,891 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:47:12,893 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:47:12,895 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:47:12,896 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:47:12,898 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:47:12,898 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:47:12,900 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:47:12,904 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:47:12,907 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:47:12,908 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:47:12,909 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:47:12,910 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:47:12,912 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:47:12,919 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:47:12,920 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:47:12,921 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:47:12,921 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 18:47:12,935 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:47:12,935 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:47:12,936 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:47:12,936 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:47:12,936 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:47:12,937 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:47:12,937 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:47:12,937 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:47:12,937 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:47:12,937 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:47:12,938 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:47:12,938 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:47:12,938 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:47:12,938 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:47:12,938 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:47:12,939 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:47:12,939 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:47:12,939 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:47:12,939 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:47:12,939 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:47:12,941 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:47:12,941 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:47:12,942 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:47:12,942 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:47:12,942 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:47:12,942 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:47:12,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:47:12,943 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:47:12,943 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:47:13,234 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:47:13,247 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:47:13,251 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:47:13,252 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:47:13,253 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:47:13,253 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_01.i [2019-11-06 18:47:13,321 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb244fa7d/2103a6b857e14242b3ad9f18ddf61484/FLAGd7862e081 [2019-11-06 18:47:13,798 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:47:13,799 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_01.i [2019-11-06 18:47:13,805 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb244fa7d/2103a6b857e14242b3ad9f18ddf61484/FLAGd7862e081 [2019-11-06 18:47:14,209 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb244fa7d/2103a6b857e14242b3ad9f18ddf61484 [2019-11-06 18:47:14,219 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:47:14,221 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:47:14,222 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:14,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:47:14,226 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:47:14,227 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,230 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4da2c6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14, skipping insertion in model container [2019-11-06 18:47:14,231 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,238 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:47:14,257 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:47:14,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:14,431 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:47:14,457 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:14,474 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:47:14,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14 WrapperNode [2019-11-06 18:47:14,475 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:14,476 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:47:14,476 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:47:14,476 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:47:14,566 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,567 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,574 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,575 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,582 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,588 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,593 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (1/1) ... [2019-11-06 18:47:14,595 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:47:14,596 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:47:14,596 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:47:14,596 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:47:14,597 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (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 18:47:14,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:47:14,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:47:14,658 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:47:14,658 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:47:14,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:47:14,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:47:14,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:47:14,658 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:47:14,658 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:47:14,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:47:14,659 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:47:14,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:47:14,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:47:14,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:47:14,879 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:47:14,880 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:47:14,881 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:14 BoogieIcfgContainer [2019-11-06 18:47:14,881 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:47:14,882 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:47:14,882 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:47:14,885 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:47:14,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:47:14" (1/3) ... [2019-11-06 18:47:14,886 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1146601e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:14, skipping insertion in model container [2019-11-06 18:47:14,887 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:14" (2/3) ... [2019-11-06 18:47:14,887 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1146601e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:14, skipping insertion in model container [2019-11-06 18:47:14,887 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:14" (3/3) ... [2019-11-06 18:47:14,889 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_01.i [2019-11-06 18:47:14,899 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:47:14,907 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:47:14,919 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:47:14,954 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:47:14,954 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:47:14,958 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:47:14,958 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:47:14,958 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:47:14,959 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:47:14,959 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:47:14,959 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:47:14,992 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-11-06 18:47:15,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:47:15,000 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:15,001 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:15,009 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:15,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:15,016 INFO L82 PathProgramCache]: Analyzing trace with hash -2029643862, now seen corresponding path program 1 times [2019-11-06 18:47:15,026 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:15,026 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589151916] [2019-11-06 18:47:15,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:15,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,200 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 18:47:15,201 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589151916] [2019-11-06 18:47:15,202 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:15,202 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:47:15,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755746147] [2019-11-06 18:47:15,208 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:47:15,208 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:15,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:47:15,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:47:15,226 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2019-11-06 18:47:15,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:15,303 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-11-06 18:47:15,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:47:15,305 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:47:15,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:15,315 INFO L225 Difference]: With dead ends: 41 [2019-11-06 18:47:15,315 INFO L226 Difference]: Without dead ends: 19 [2019-11-06 18:47:15,319 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 18:47:15,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-06 18:47:15,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-06 18:47:15,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 18:47:15,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-06 18:47:15,362 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2019-11-06 18:47:15,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:15,363 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-06 18:47:15,363 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:47:15,363 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-06 18:47:15,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:47:15,364 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:15,364 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:15,365 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:15,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:15,366 INFO L82 PathProgramCache]: Analyzing trace with hash 905206694, now seen corresponding path program 1 times [2019-11-06 18:47:15,366 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:15,366 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722807587] [2019-11-06 18:47:15,367 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:15,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,463 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 18:47:15,466 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722807587] [2019-11-06 18:47:15,466 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:15,466 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:47:15,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728933918] [2019-11-06 18:47:15,471 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:47:15,471 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:15,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:47:15,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:15,473 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-11-06 18:47:15,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:15,598 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2019-11-06 18:47:15,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:47:15,599 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:47:15,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:15,602 INFO L225 Difference]: With dead ends: 36 [2019-11-06 18:47:15,602 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:47:15,604 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 18:47:15,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:47:15,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2019-11-06 18:47:15,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 18:47:15,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-06 18:47:15,626 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2019-11-06 18:47:15,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:15,627 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-06 18:47:15,627 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:47:15,627 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-06 18:47:15,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:47:15,629 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:15,629 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:15,630 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:15,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:15,632 INFO L82 PathProgramCache]: Analyzing trace with hash -59429947, now seen corresponding path program 1 times [2019-11-06 18:47:15,632 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:15,632 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768957742] [2019-11-06 18:47:15,633 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:15,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,799 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 18:47:15,800 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768957742] [2019-11-06 18:47:15,800 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162813703] [2019-11-06 18:47:15,801 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 18:47:15,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,875 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:47:15,883 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:15,927 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 18:47:15,928 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:15,928 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:47:15,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576919213] [2019-11-06 18:47:15,933 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:47:15,934 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:15,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:47:15,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:15,935 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 6 states. [2019-11-06 18:47:16,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:16,068 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2019-11-06 18:47:16,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:47:16,069 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-06 18:47:16,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:16,071 INFO L225 Difference]: With dead ends: 42 [2019-11-06 18:47:16,071 INFO L226 Difference]: Without dead ends: 29 [2019-11-06 18:47:16,072 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 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 18:47:16,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-06 18:47:16,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2019-11-06 18:47:16,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:47:16,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-11-06 18:47:16,086 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2019-11-06 18:47:16,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:16,087 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-11-06 18:47:16,087 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:47:16,087 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-11-06 18:47:16,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:47:16,089 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:16,089 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:16,295 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:16,296 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:16,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:16,297 INFO L82 PathProgramCache]: Analyzing trace with hash -406079354, now seen corresponding path program 2 times [2019-11-06 18:47:16,297 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:16,298 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651083283] [2019-11-06 18:47:16,299 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:16,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:16,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651083283] [2019-11-06 18:47:16,399 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927061376] [2019-11-06 18:47:16,399 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 18:47:16,470 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:16,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:16,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:47:16,474 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:16,488 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:16,488 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:16,489 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:47:16,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853769674] [2019-11-06 18:47:16,489 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:47:16,490 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:16,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:47:16,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:47:16,490 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2019-11-06 18:47:16,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:16,620 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2019-11-06 18:47:16,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:47:16,621 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-11-06 18:47:16,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:16,622 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:47:16,622 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 18:47:16,622 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 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 18:47:16,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 18:47:16,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2019-11-06 18:47:16,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 18:47:16,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2019-11-06 18:47:16,635 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2019-11-06 18:47:16,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:16,636 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2019-11-06 18:47:16,636 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:47:16,636 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2019-11-06 18:47:16,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-06 18:47:16,640 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:16,641 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:16,841 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:16,842 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:16,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:16,843 INFO L82 PathProgramCache]: Analyzing trace with hash -820912923, now seen corresponding path program 3 times [2019-11-06 18:47:16,844 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:16,844 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730327073] [2019-11-06 18:47:16,845 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:16,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:47:16,955 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730327073] [2019-11-06 18:47:16,955 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644931075] [2019-11-06 18:47:16,955 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 18:47:17,020 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:47:17,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:17,022 INFO L256 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:47:17,025 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:17,039 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:47:17,039 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:17,039 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:47:17,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186331200] [2019-11-06 18:47:17,040 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:47:17,041 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:17,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:47:17,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:17,042 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2019-11-06 18:47:17,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:17,156 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2019-11-06 18:47:17,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:47:17,157 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-11-06 18:47:17,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:17,158 INFO L225 Difference]: With dead ends: 54 [2019-11-06 18:47:17,158 INFO L226 Difference]: Without dead ends: 39 [2019-11-06 18:47:17,159 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:17,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-06 18:47:17,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2019-11-06 18:47:17,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:47:17,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-11-06 18:47:17,165 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 21 [2019-11-06 18:47:17,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:17,166 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-11-06 18:47:17,166 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:47:17,166 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-11-06 18:47:17,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:47:17,167 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:17,167 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:17,371 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:17,377 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:17,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:17,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1912151398, now seen corresponding path program 4 times [2019-11-06 18:47:17,378 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:17,378 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218961643] [2019-11-06 18:47:17,378 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:17,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:17,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:17,489 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:47:17,489 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218961643] [2019-11-06 18:47:17,489 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913071893] [2019-11-06 18:47:17,490 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:17,532 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:17,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:17,533 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:47:17,535 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:17,549 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:47:17,550 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:17,550 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:47:17,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970491888] [2019-11-06 18:47:17,551 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:47:17,551 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:17,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:47:17,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:47:17,552 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 9 states. [2019-11-06 18:47:17,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:17,694 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2019-11-06 18:47:17,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:47:17,695 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2019-11-06 18:47:17,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:17,696 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:47:17,696 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 18:47:17,697 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 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 18:47:17,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 18:47:17,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 29. [2019-11-06 18:47:17,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:47:17,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-06 18:47:17,703 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 23 [2019-11-06 18:47:17,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:17,704 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-06 18:47:17,704 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:47:17,704 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-06 18:47:17,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:47:17,705 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:17,705 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:17,909 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:17,909 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:17,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:17,909 INFO L82 PathProgramCache]: Analyzing trace with hash 378570245, now seen corresponding path program 5 times [2019-11-06 18:47:17,910 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:17,910 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166462502] [2019-11-06 18:47:17,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:17,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,047 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:47:18,048 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166462502] [2019-11-06 18:47:18,049 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900835809] [2019-11-06 18:47:18,049 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:18,196 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 18:47:18,196 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:18,198 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:47:18,200 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:18,214 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:47:18,215 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:18,215 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:47:18,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295530634] [2019-11-06 18:47:18,216 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:47:18,216 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:18,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:47:18,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:18,217 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 10 states. [2019-11-06 18:47:18,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:18,364 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2019-11-06 18:47:18,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:47:18,365 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2019-11-06 18:47:18,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:18,366 INFO L225 Difference]: With dead ends: 66 [2019-11-06 18:47:18,366 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:47:18,367 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 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 18:47:18,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:47:18,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 31. [2019-11-06 18:47:18,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 18:47:18,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2019-11-06 18:47:18,373 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 25 [2019-11-06 18:47:18,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:18,374 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2019-11-06 18:47:18,374 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:47:18,374 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2019-11-06 18:47:18,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:47:18,375 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:18,375 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:18,579 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:18,580 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:18,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:18,580 INFO L82 PathProgramCache]: Analyzing trace with hash -1539667386, now seen corresponding path program 6 times [2019-11-06 18:47:18,581 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:18,581 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960734395] [2019-11-06 18:47:18,581 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:18,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,691 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:47:18,692 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960734395] [2019-11-06 18:47:18,692 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363388061] [2019-11-06 18:47:18,692 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:18,796 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-11-06 18:47:18,796 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:18,797 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:47:18,799 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:18,816 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:47:18,817 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:18,817 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:47:18,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675861794] [2019-11-06 18:47:18,817 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:47:18,818 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:18,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:47:18,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:18,818 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 11 states. [2019-11-06 18:47:18,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:18,998 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2019-11-06 18:47:18,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:47:18,998 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2019-11-06 18:47:18,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:18,999 INFO L225 Difference]: With dead ends: 72 [2019-11-06 18:47:19,000 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:47:19,000 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:19,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:47:19,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 33. [2019-11-06 18:47:19,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 18:47:19,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-11-06 18:47:19,007 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2019-11-06 18:47:19,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:19,007 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-11-06 18:47:19,007 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:47:19,007 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-11-06 18:47:19,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 18:47:19,008 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:19,009 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:19,213 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:19,214 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:19,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:19,215 INFO L82 PathProgramCache]: Analyzing trace with hash -411883739, now seen corresponding path program 7 times [2019-11-06 18:47:19,215 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:19,215 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983842312] [2019-11-06 18:47:19,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:19,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,312 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:47:19,313 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983842312] [2019-11-06 18:47:19,313 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021300148] [2019-11-06 18:47:19,313 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:19,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,365 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:47:19,366 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:19,391 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:47:19,392 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:19,392 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:47:19,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91999148] [2019-11-06 18:47:19,393 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:47:19,393 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:19,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:47:19,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:47:19,393 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 12 states. [2019-11-06 18:47:19,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:19,534 INFO L93 Difference]: Finished difference Result 78 states and 91 transitions. [2019-11-06 18:47:19,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:47:19,534 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2019-11-06 18:47:19,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:19,535 INFO L225 Difference]: With dead ends: 78 [2019-11-06 18:47:19,536 INFO L226 Difference]: Without dead ends: 59 [2019-11-06 18:47:19,536 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 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 18:47:19,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-06 18:47:19,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2019-11-06 18:47:19,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:47:19,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-11-06 18:47:19,542 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 29 [2019-11-06 18:47:19,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:19,543 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-11-06 18:47:19,543 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:47:19,543 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-11-06 18:47:19,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:47:19,544 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:19,544 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:19,753 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:19,754 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:19,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:19,755 INFO L82 PathProgramCache]: Analyzing trace with hash -959578330, now seen corresponding path program 8 times [2019-11-06 18:47:19,755 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:19,756 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60987767] [2019-11-06 18:47:19,756 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:19,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,888 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:47:19,888 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60987767] [2019-11-06 18:47:19,888 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090113197] [2019-11-06 18:47:19,888 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 18:47:19,949 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:19,950 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:19,951 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:47:19,953 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:19,969 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:47:19,969 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:19,970 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:47:19,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706961256] [2019-11-06 18:47:19,970 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:47:19,970 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:19,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:47:19,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:47:19,971 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 13 states. [2019-11-06 18:47:20,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:20,136 INFO L93 Difference]: Finished difference Result 84 states and 98 transitions. [2019-11-06 18:47:20,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:47:20,136 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2019-11-06 18:47:20,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:20,137 INFO L225 Difference]: With dead ends: 84 [2019-11-06 18:47:20,138 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:47:20,138 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 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 18:47:20,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:47:20,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 37. [2019-11-06 18:47:20,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 18:47:20,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2019-11-06 18:47:20,146 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 31 [2019-11-06 18:47:20,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:20,146 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2019-11-06 18:47:20,146 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:47:20,146 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2019-11-06 18:47:20,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-06 18:47:20,147 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:20,147 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:20,351 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:20,351 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:20,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:20,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1380204475, now seen corresponding path program 9 times [2019-11-06 18:47:20,352 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:20,353 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916301786] [2019-11-06 18:47:20,353 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:20,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,498 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 18:47:20,499 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916301786] [2019-11-06 18:47:20,499 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695929401] [2019-11-06 18:47:20,499 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 18:47:20,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:47:20,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:20,887 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:47:20,889 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:20,907 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 18:47:20,907 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:20,907 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 18:47:20,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50860443] [2019-11-06 18:47:20,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:47:20,908 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:20,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:47:20,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:20,909 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 14 states. [2019-11-06 18:47:21,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:21,132 INFO L93 Difference]: Finished difference Result 90 states and 105 transitions. [2019-11-06 18:47:21,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 18:47:21,132 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2019-11-06 18:47:21,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:21,134 INFO L225 Difference]: With dead ends: 90 [2019-11-06 18:47:21,134 INFO L226 Difference]: Without dead ends: 69 [2019-11-06 18:47:21,135 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:21,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-11-06 18:47:21,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 39. [2019-11-06 18:47:21,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 18:47:21,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-11-06 18:47:21,142 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 33 [2019-11-06 18:47:21,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:21,142 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-11-06 18:47:21,142 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:47:21,142 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-11-06 18:47:21,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:47:21,143 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:21,144 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:21,348 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:21,348 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:21,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:21,349 INFO L82 PathProgramCache]: Analyzing trace with hash 2054257670, now seen corresponding path program 10 times [2019-11-06 18:47:21,349 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:21,349 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157790369] [2019-11-06 18:47:21,349 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:21,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:21,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:21,606 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:21,606 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157790369] [2019-11-06 18:47:21,606 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017897025] [2019-11-06 18:47:21,606 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:21,672 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:21,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:21,674 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:47:21,676 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:21,698 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:21,701 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:21,701 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:47:21,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861854056] [2019-11-06 18:47:21,702 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:47:21,702 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:21,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:47:21,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:47:21,703 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 15 states. [2019-11-06 18:47:21,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:21,934 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2019-11-06 18:47:21,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:47:21,935 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2019-11-06 18:47:21,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:21,936 INFO L225 Difference]: With dead ends: 96 [2019-11-06 18:47:21,936 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 18:47:21,937 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:47:21,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 18:47:21,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 41. [2019-11-06 18:47:21,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 18:47:21,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-11-06 18:47:21,948 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 35 [2019-11-06 18:47:21,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:21,948 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-11-06 18:47:21,948 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:47:21,949 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-11-06 18:47:21,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-06 18:47:21,952 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:21,952 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:22,156 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:22,157 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:22,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:22,158 INFO L82 PathProgramCache]: Analyzing trace with hash 1290555749, now seen corresponding path program 11 times [2019-11-06 18:47:22,158 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:22,159 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234300065] [2019-11-06 18:47:22,159 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:22,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:22,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:22,311 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:47:22,312 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234300065] [2019-11-06 18:47:22,312 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957986406] [2019-11-06 18:47:22,313 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:23,850 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:47:23,850 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:23,853 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:47:23,861 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:23,893 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:47:23,893 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:23,893 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:47:23,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882080153] [2019-11-06 18:47:23,894 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:47:23,894 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:23,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:47:23,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:47:23,895 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 16 states. [2019-11-06 18:47:24,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:24,131 INFO L93 Difference]: Finished difference Result 102 states and 119 transitions. [2019-11-06 18:47:24,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:47:24,132 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2019-11-06 18:47:24,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:24,133 INFO L225 Difference]: With dead ends: 102 [2019-11-06 18:47:24,133 INFO L226 Difference]: Without dead ends: 79 [2019-11-06 18:47:24,134 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:47:24,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-11-06 18:47:24,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 43. [2019-11-06 18:47:24,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:47:24,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2019-11-06 18:47:24,141 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2019-11-06 18:47:24,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:24,142 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2019-11-06 18:47:24,142 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:47:24,142 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2019-11-06 18:47:24,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:47:24,143 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:24,143 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:24,349 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:24,349 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:24,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:24,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1738342170, now seen corresponding path program 12 times [2019-11-06 18:47:24,350 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:24,350 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408296855] [2019-11-06 18:47:24,350 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:24,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:24,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:24,549 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-06 18:47:24,549 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408296855] [2019-11-06 18:47:24,550 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236314135] [2019-11-06 18:47:24,550 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:25,475 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:47:25,476 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:25,478 INFO L256 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:47:25,480 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:25,498 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-06 18:47:25,498 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:25,499 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 18:47:25,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991666502] [2019-11-06 18:47:25,499 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:47:25,500 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:25,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:47:25,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:47:25,500 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 17 states. [2019-11-06 18:47:25,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:25,757 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2019-11-06 18:47:25,758 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 18:47:25,758 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2019-11-06 18:47:25,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:25,759 INFO L225 Difference]: With dead ends: 108 [2019-11-06 18:47:25,759 INFO L226 Difference]: Without dead ends: 84 [2019-11-06 18:47:25,760 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:47:25,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-06 18:47:25,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 45. [2019-11-06 18:47:25,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 18:47:25,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2019-11-06 18:47:25,775 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 39 [2019-11-06 18:47:25,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:25,775 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2019-11-06 18:47:25,775 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:47:25,775 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2019-11-06 18:47:25,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-06 18:47:25,776 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:25,776 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:25,985 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:25,986 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:25,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:25,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1074190981, now seen corresponding path program 13 times [2019-11-06 18:47:25,986 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:25,987 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657414583] [2019-11-06 18:47:25,987 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:26,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:26,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:26,179 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-11-06 18:47:26,180 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657414583] [2019-11-06 18:47:26,180 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527225721] [2019-11-06 18:47:26,180 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:26,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:26,247 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:47:26,250 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:26,274 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-11-06 18:47:26,276 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:26,276 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:47:26,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247096146] [2019-11-06 18:47:26,277 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:47:26,277 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:26,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:47:26,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:47:26,279 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 18 states. [2019-11-06 18:47:26,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:26,550 INFO L93 Difference]: Finished difference Result 114 states and 133 transitions. [2019-11-06 18:47:26,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:47:26,551 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2019-11-06 18:47:26,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:26,552 INFO L225 Difference]: With dead ends: 114 [2019-11-06 18:47:26,552 INFO L226 Difference]: Without dead ends: 89 [2019-11-06 18:47:26,553 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 42 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 18:47:26,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-11-06 18:47:26,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 47. [2019-11-06 18:47:26,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 18:47:26,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2019-11-06 18:47:26,565 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 41 [2019-11-06 18:47:26,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:26,566 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2019-11-06 18:47:26,566 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:47:26,566 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2019-11-06 18:47:26,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-06 18:47:26,569 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:26,570 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:26,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:26,774 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:26,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:26,775 INFO L82 PathProgramCache]: Analyzing trace with hash 308317638, now seen corresponding path program 14 times [2019-11-06 18:47:26,775 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:26,775 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575171999] [2019-11-06 18:47:26,775 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:26,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:26,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:26,969 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-11-06 18:47:26,970 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575171999] [2019-11-06 18:47:26,970 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534820178] [2019-11-06 18:47:26,970 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:27,029 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:27,029 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:27,030 INFO L256 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:47:27,036 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:27,049 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-11-06 18:47:27,050 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:27,050 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:47:27,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911161913] [2019-11-06 18:47:27,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:47:27,051 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:27,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:47:27,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:47:27,051 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 19 states. [2019-11-06 18:47:27,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:27,376 INFO L93 Difference]: Finished difference Result 120 states and 140 transitions. [2019-11-06 18:47:27,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:47:27,377 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2019-11-06 18:47:27,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:27,378 INFO L225 Difference]: With dead ends: 120 [2019-11-06 18:47:27,379 INFO L226 Difference]: Without dead ends: 94 [2019-11-06 18:47:27,380 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 44 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 18:47:27,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-06 18:47:27,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 49. [2019-11-06 18:47:27,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 18:47:27,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2019-11-06 18:47:27,386 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 43 [2019-11-06 18:47:27,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:27,386 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2019-11-06 18:47:27,386 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:47:27,386 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2019-11-06 18:47:27,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-06 18:47:27,387 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:27,387 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:27,595 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:27,596 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:27,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:27,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1181918299, now seen corresponding path program 15 times [2019-11-06 18:47:27,596 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:27,597 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040015609] [2019-11-06 18:47:27,597 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:27,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:27,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:27,805 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-11-06 18:47:27,805 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040015609] [2019-11-06 18:47:27,805 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149832498] [2019-11-06 18:47:27,805 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:33,692 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:47:33,692 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:33,700 INFO L256 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 18:47:33,701 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:33,719 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-11-06 18:47:33,720 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:33,720 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:47:33,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677210166] [2019-11-06 18:47:33,721 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:47:33,721 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:33,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:47:33,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:47:33,722 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 20 states. [2019-11-06 18:47:34,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:34,046 INFO L93 Difference]: Finished difference Result 126 states and 147 transitions. [2019-11-06 18:47:34,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:47:34,047 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2019-11-06 18:47:34,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:34,048 INFO L225 Difference]: With dead ends: 126 [2019-11-06 18:47:34,048 INFO L226 Difference]: Without dead ends: 99 [2019-11-06 18:47:34,049 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 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 18:47:34,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-06 18:47:34,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 51. [2019-11-06 18:47:34,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 18:47:34,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-11-06 18:47:34,053 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2019-11-06 18:47:34,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:34,053 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-11-06 18:47:34,054 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:47:34,054 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-11-06 18:47:34,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:47:34,054 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:34,054 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:34,255 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:34,255 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:34,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:34,255 INFO L82 PathProgramCache]: Analyzing trace with hash -760733018, now seen corresponding path program 16 times [2019-11-06 18:47:34,256 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:34,256 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67997560] [2019-11-06 18:47:34,256 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:34,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:34,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:34,482 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:47:34,482 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67997560] [2019-11-06 18:47:34,482 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594762173] [2019-11-06 18:47:34,482 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:34,549 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:34,549 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:34,550 INFO L256 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:47:34,551 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:34,567 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:47:34,567 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:34,567 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:47:34,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869268409] [2019-11-06 18:47:34,568 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:47:34,568 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:34,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:47:34,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:47:34,569 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 21 states. [2019-11-06 18:47:34,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:34,927 INFO L93 Difference]: Finished difference Result 132 states and 154 transitions. [2019-11-06 18:47:34,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:47:34,927 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2019-11-06 18:47:34,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:34,929 INFO L225 Difference]: With dead ends: 132 [2019-11-06 18:47:34,929 INFO L226 Difference]: Without dead ends: 104 [2019-11-06 18:47:34,930 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 48 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 18:47:34,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-11-06 18:47:34,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 53. [2019-11-06 18:47:34,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 18:47:34,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2019-11-06 18:47:34,935 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 47 [2019-11-06 18:47:34,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:34,936 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2019-11-06 18:47:34,936 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:47:34,936 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2019-11-06 18:47:34,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-06 18:47:34,937 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:34,937 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:35,140 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:35,140 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:35,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:35,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1014901563, now seen corresponding path program 17 times [2019-11-06 18:47:35,141 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:35,142 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359667609] [2019-11-06 18:47:35,142 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:35,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:35,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:35,373 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:47:35,373 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359667609] [2019-11-06 18:47:35,374 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260993897] [2019-11-06 18:47:35,374 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:48:04,121 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-11-06 18:48:04,121 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:48:04,139 INFO L256 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:48:04,140 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:48:04,164 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:48:04,165 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:48:04,165 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:48:04,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981883275] [2019-11-06 18:48:04,167 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:48:04,167 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:48:04,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:48:04,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:48:04,168 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 22 states.