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_find_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:44:17,889 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:44:17,892 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:44:17,911 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:44:17,911 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:44:17,913 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:44:17,915 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:44:17,927 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:44:17,929 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:44:17,931 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:44:17,932 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:44:17,933 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:44:17,933 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:44:17,934 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:44:17,935 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:44:17,936 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:44:17,937 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:44:17,939 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:44:17,940 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:44:17,945 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:44:17,949 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:44:17,951 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:44:17,952 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:44:17,953 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:44:17,958 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:44:17,964 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:44:17,966 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:44:17,967 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:44:17,968 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:44:17,972 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:44:17,972 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:44:17,973 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:44:17,973 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:44:17,973 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:44:17,974 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:44:17,978 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:44:17,979 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:44:18,000 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:44:18,000 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:44:18,002 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:44:18,003 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:44:18,003 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:44:18,003 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:44:18,003 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:44:18,004 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:44:18,004 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:44:18,004 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:44:18,005 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:44:18,006 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:44:18,006 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:44:18,006 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:44:18,006 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:44:18,007 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:44:18,007 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:44:18,007 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:44:18,007 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:44:18,007 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:44:18,008 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:44:18,008 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:18,008 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:44:18,008 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:44:18,008 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:44:18,009 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:44:18,009 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:44:18,009 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:44:18,009 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:44:18,293 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:44:18,316 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:44:18,320 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:44:18,322 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:44:18,322 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:44:18,323 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-10-14 21:44:18,387 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fe00718c/c97c6ecca00c49fb8ce2b0c0755ae62a/FLAG54db39f17 [2019-10-14 21:44:18,843 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:44:18,844 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-10-14 21:44:18,852 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fe00718c/c97c6ecca00c49fb8ce2b0c0755ae62a/FLAG54db39f17 [2019-10-14 21:44:19,245 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fe00718c/c97c6ecca00c49fb8ce2b0c0755ae62a [2019-10-14 21:44:19,256 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:44:19,258 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:44:19,259 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:19,259 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:44:19,263 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:44:19,264 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,267 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65f25ee7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19, skipping insertion in model container [2019-10-14 21:44:19,267 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,275 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:44:19,293 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:44:19,466 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:19,470 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:44:19,490 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:19,508 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:44:19,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19 WrapperNode [2019-10-14 21:44:19,509 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:19,510 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:44:19,510 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:44:19,510 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:44:19,606 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,606 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,614 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,627 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,633 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,634 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... [2019-10-14 21:44:19,636 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:44:19,637 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:44:19,637 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:44:19,637 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:44:19,638 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:19,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:44:19,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:44:19,688 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:44:19,689 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:44:19,689 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:44:19,689 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:44:19,689 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:44:19,689 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:44:19,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:44:19,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:44:19,690 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:44:19,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:44:19,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:44:19,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:44:19,988 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:44:19,988 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:44:19,989 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:19 BoogieIcfgContainer [2019-10-14 21:44:19,990 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:44:19,991 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:44:19,991 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:44:19,994 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:44:19,994 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:44:19" (1/3) ... [2019-10-14 21:44:19,995 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3514bb5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:19, skipping insertion in model container [2019-10-14 21:44:19,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:19" (2/3) ... [2019-10-14 21:44:19,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3514bb5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:19, skipping insertion in model container [2019-10-14 21:44:19,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:19" (3/3) ... [2019-10-14 21:44:19,997 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_find_ground-1.i [2019-10-14 21:44:20,008 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:44:20,015 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:44:20,024 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:44:20,046 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:44:20,046 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:44:20,046 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:44:20,046 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:44:20,046 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:44:20,046 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:44:20,047 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:44:20,047 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:44:20,062 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-14 21:44:20,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:44:20,067 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:20,068 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:20,070 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:20,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:20,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1063635089, now seen corresponding path program 1 times [2019-10-14 21:44:20,082 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:20,082 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697715613] [2019-10-14 21:44:20,082 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,083 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:20,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:20,268 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697715613] [2019-10-14 21:44:20,269 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:20,270 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:44:20,270 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095869079] [2019-10-14 21:44:20,275 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:44:20,275 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:20,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:44:20,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:20,293 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-14 21:44:20,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:20,465 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2019-10-14 21:44:20,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:44:20,468 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-14 21:44:20,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:20,481 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:44:20,481 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:44:20,490 INFO L600 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 [2019-10-14 21:44:20,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:44:20,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:44:20,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:44:20,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-14 21:44:20,548 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2019-10-14 21:44:20,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:20,549 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-14 21:44:20,549 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:44:20,549 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-14 21:44:20,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:44:20,551 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:20,551 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:20,552 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:20,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:20,553 INFO L82 PathProgramCache]: Analyzing trace with hash -977598642, now seen corresponding path program 1 times [2019-10-14 21:44:20,553 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:20,554 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884768870] [2019-10-14 21:44:20,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,555 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:20,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:20,696 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884768870] [2019-10-14 21:44:20,697 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:20,697 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:44:20,697 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813686295] [2019-10-14 21:44:20,699 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:44:20,699 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:20,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:44:20,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:20,700 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 4 states. [2019-10-14 21:44:20,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:20,768 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2019-10-14 21:44:20,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:44:20,768 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-14 21:44:20,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:20,770 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:44:20,770 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:44:20,771 INFO L600 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 [2019-10-14 21:44:20,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:44:20,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-10-14 21:44:20,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-14 21:44:20,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-10-14 21:44:20,778 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2019-10-14 21:44:20,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:20,779 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-10-14 21:44:20,779 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:44:20,779 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-10-14 21:44:20,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 21:44:20,780 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:20,781 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:20,781 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:20,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:20,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1311771152, now seen corresponding path program 1 times [2019-10-14 21:44:20,782 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:20,782 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319522445] [2019-10-14 21:44:20,782 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,783 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:20,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:44:20,878 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319522445] [2019-10-14 21:44:20,878 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:20,878 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-14 21:44:20,879 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368529153] [2019-10-14 21:44:20,879 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:44:20,879 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:20,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:44:20,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:44:20,880 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 5 states. [2019-10-14 21:44:20,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:20,952 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-10-14 21:44:20,952 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:44:20,953 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2019-10-14 21:44:20,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:20,954 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:44:20,954 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:44:20,955 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:44:20,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:44:20,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:44:20,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:44:20,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-10-14 21:44:20,961 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 18 [2019-10-14 21:44:20,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:20,962 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-10-14 21:44:20,962 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:44:20,962 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-10-14 21:44:20,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 21:44:20,963 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:20,963 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:20,963 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:20,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:20,964 INFO L82 PathProgramCache]: Analyzing trace with hash 605671840, now seen corresponding path program 1 times [2019-10-14 21:44:20,964 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:20,964 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232460296] [2019-10-14 21:44:20,965 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,965 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,965 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:20,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,063 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:21,064 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232460296] [2019-10-14 21:44:21,064 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790174586] [2019-10-14 21:44:21,067 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,151 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:44:21,160 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:21,203 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:21,206 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:21,206 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:44:21,207 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776424872] [2019-10-14 21:44:21,210 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:44:21,210 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:21,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:44:21,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:21,213 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 6 states. [2019-10-14 21:44:21,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:21,321 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-14 21:44:21,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:44:21,321 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2019-10-14 21:44:21,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:21,322 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:44:21,322 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 21:44:21,323 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:21,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 21:44:21,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-10-14 21:44:21,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:44:21,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-10-14 21:44:21,329 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2019-10-14 21:44:21,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:21,330 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-10-14 21:44:21,330 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:44:21,330 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-10-14 21:44:21,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:44:21,331 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:21,331 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:21,534 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,535 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:21,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:21,535 INFO L82 PathProgramCache]: Analyzing trace with hash -631588802, now seen corresponding path program 2 times [2019-10-14 21:44:21,536 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:21,536 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214859919] [2019-10-14 21:44:21,536 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:21,536 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:21,536 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:21,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,616 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:21,617 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214859919] [2019-10-14 21:44:21,617 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557018328] [2019-10-14 21:44:21,617 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,661 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:21,662 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:21,663 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:44:21,664 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:21,680 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:21,681 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:21,682 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:44:21,682 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867100795] [2019-10-14 21:44:21,682 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:44:21,683 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:21,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:44:21,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:21,684 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2019-10-14 21:44:21,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:21,769 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2019-10-14 21:44:21,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:44:21,769 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-14 21:44:21,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:21,770 INFO L225 Difference]: With dead ends: 48 [2019-10-14 21:44:21,771 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:44:21,774 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:21,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:44:21,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-10-14 21:44:21,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-14 21:44:21,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-10-14 21:44:21,782 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 23 [2019-10-14 21:44:21,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:21,783 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-10-14 21:44:21,783 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:44:21,783 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-10-14 21:44:21,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:44:21,786 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:21,786 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:21,994 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,995 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:21,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:21,995 INFO L82 PathProgramCache]: Analyzing trace with hash 66875228, now seen corresponding path program 3 times [2019-10-14 21:44:21,995 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:21,996 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113458193] [2019-10-14 21:44:21,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:21,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:21,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:22,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:22,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:22,096 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:44:22,096 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113458193] [2019-10-14 21:44:22,097 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319802294] [2019-10-14 21:44:22,097 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:22,135 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 21:44:22,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:22,137 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:44:22,139 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:22,280 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-14 21:44:22,284 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:22,287 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:22,287 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:22,288 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-14 21:44:22,302 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:22,338 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:44:22,339 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:22,339 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2019-10-14 21:44:22,340 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674495095] [2019-10-14 21:44:22,340 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:44:22,340 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:22,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:44:22,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:44:22,343 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 14 states. [2019-10-14 21:44:22,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:22,763 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2019-10-14 21:44:22,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:44:22,764 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2019-10-14 21:44:22,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:22,767 INFO L225 Difference]: With dead ends: 67 [2019-10-14 21:44:22,767 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 21:44:22,768 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:44:22,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 21:44:22,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-10-14 21:44:22,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:44:22,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2019-10-14 21:44:22,790 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 25 [2019-10-14 21:44:22,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:22,791 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2019-10-14 21:44:22,791 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:44:22,791 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2019-10-14 21:44:22,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:44:22,793 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:22,793 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:23,001 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,002 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:23,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:23,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1976974460, now seen corresponding path program 1 times [2019-10-14 21:44:23,002 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:23,003 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105162526] [2019-10-14 21:44:23,003 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,003 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,003 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:23,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,059 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:44:23,059 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105162526] [2019-10-14 21:44:23,060 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:23,060 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:44:23,060 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392937406] [2019-10-14 21:44:23,060 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:44:23,061 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:23,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:44:23,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:23,062 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 4 states. [2019-10-14 21:44:23,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:23,116 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2019-10-14 21:44:23,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:44:23,117 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2019-10-14 21:44:23,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:23,119 INFO L225 Difference]: With dead ends: 64 [2019-10-14 21:44:23,119 INFO L226 Difference]: Without dead ends: 39 [2019-10-14 21:44:23,120 INFO L600 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 [2019-10-14 21:44:23,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-14 21:44:23,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-10-14 21:44:23,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-14 21:44:23,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-10-14 21:44:23,126 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 27 [2019-10-14 21:44:23,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:23,127 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-10-14 21:44:23,127 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:44:23,127 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-10-14 21:44:23,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:44:23,128 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:23,128 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:23,128 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:23,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:23,129 INFO L82 PathProgramCache]: Analyzing trace with hash 107032625, now seen corresponding path program 1 times [2019-10-14 21:44:23,129 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:23,129 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237563642] [2019-10-14 21:44:23,129 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,130 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,130 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:23,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,246 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:44:23,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237563642] [2019-10-14 21:44:23,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857428511] [2019-10-14 21:44:23,247 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,296 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:44:23,299 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:23,355 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 21:44:23,355 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:23,355 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2019-10-14 21:44:23,355 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915576580] [2019-10-14 21:44:23,356 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:44:23,356 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:23,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:44:23,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:23,357 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 12 states. [2019-10-14 21:44:23,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:23,534 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2019-10-14 21:44:23,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:44:23,535 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2019-10-14 21:44:23,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:23,536 INFO L225 Difference]: With dead ends: 76 [2019-10-14 21:44:23,536 INFO L226 Difference]: Without dead ends: 45 [2019-10-14 21:44:23,537 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:23,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-14 21:44:23,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2019-10-14 21:44:23,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:44:23,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2019-10-14 21:44:23,544 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 35 [2019-10-14 21:44:23,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:23,544 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2019-10-14 21:44:23,544 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:44:23,544 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2019-10-14 21:44:23,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-14 21:44:23,545 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:23,545 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:23,756 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,757 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:23,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:23,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1471316655, now seen corresponding path program 2 times [2019-10-14 21:44:23,758 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:23,758 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429379244] [2019-10-14 21:44:23,764 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,765 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,765 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:23,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,839 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-10-14 21:44:23,840 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429379244] [2019-10-14 21:44:23,840 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492707844] [2019-10-14 21:44:23,840 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,900 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:23,900 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:23,901 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:44:23,908 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:23,932 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-14 21:44:23,932 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:23,933 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:44:23,933 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094988321] [2019-10-14 21:44:23,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:44:23,934 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:23,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:44:23,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:23,935 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 10 states. [2019-10-14 21:44:24,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:24,015 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2019-10-14 21:44:24,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:44:24,015 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2019-10-14 21:44:24,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:24,017 INFO L225 Difference]: With dead ends: 74 [2019-10-14 21:44:24,017 INFO L226 Difference]: Without dead ends: 47 [2019-10-14 21:44:24,017 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:24,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-14 21:44:24,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-10-14 21:44:24,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:44:24,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-14 21:44:24,024 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 40 [2019-10-14 21:44:24,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:24,024 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-14 21:44:24,024 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:44:24,024 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-14 21:44:24,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 21:44:24,025 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:24,026 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:24,236 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:24,237 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:24,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:24,238 INFO L82 PathProgramCache]: Analyzing trace with hash -705811631, now seen corresponding path program 3 times [2019-10-14 21:44:24,238 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:24,239 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292254498] [2019-10-14 21:44:24,239 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:24,239 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:24,240 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:24,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:24,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:24,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:24,350 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-10-14 21:44:24,350 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292254498] [2019-10-14 21:44:24,350 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516838068] [2019-10-14 21:44:24,351 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:24,416 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:44:24,416 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:24,417 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:44:24,420 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:24,551 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-14 21:44:24,551 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:24,554 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:24,554 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:24,554 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-14 21:44:24,565 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:24,595 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:44:24,595 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:24,595 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2019-10-14 21:44:24,595 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424437956] [2019-10-14 21:44:24,596 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:44:24,596 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:24,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:44:24,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:24,597 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 19 states. [2019-10-14 21:44:25,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:25,157 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2019-10-14 21:44:25,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:44:25,157 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2019-10-14 21:44:25,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:25,158 INFO L225 Difference]: With dead ends: 86 [2019-10-14 21:44:25,158 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 21:44:25,159 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:44:25,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 21:44:25,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2019-10-14 21:44:25,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:44:25,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2019-10-14 21:44:25,166 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 42 [2019-10-14 21:44:25,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:25,167 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2019-10-14 21:44:25,167 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:44:25,167 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2019-10-14 21:44:25,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-14 21:44:25,168 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:25,168 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:25,374 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:25,375 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:25,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:25,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1970471850, now seen corresponding path program 4 times [2019-10-14 21:44:25,376 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:25,377 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846896487] [2019-10-14 21:44:25,377 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:25,377 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:25,377 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:25,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:25,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:25,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:25,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:25,500 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:44:25,500 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846896487] [2019-10-14 21:44:25,500 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378580335] [2019-10-14 21:44:25,500 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:25,550 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:25,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:25,551 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:44:25,553 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:25,573 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:44:25,573 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:25,574 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:44:25,574 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445683143] [2019-10-14 21:44:25,574 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:44:25,574 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:25,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:44:25,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:25,575 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 12 states. [2019-10-14 21:44:25,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:25,729 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2019-10-14 21:44:25,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:44:25,729 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2019-10-14 21:44:25,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:25,730 INFO L225 Difference]: With dead ends: 94 [2019-10-14 21:44:25,730 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 21:44:25,731 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:25,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 21:44:25,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-10-14 21:44:25,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:44:25,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-10-14 21:44:25,738 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 52 [2019-10-14 21:44:25,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:25,739 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-10-14 21:44:25,739 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:44:25,739 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-10-14 21:44:25,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-14 21:44:25,740 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:25,740 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:25,952 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:25,953 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:25,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:25,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1583139148, now seen corresponding path program 5 times [2019-10-14 21:44:25,953 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:25,953 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511935935] [2019-10-14 21:44:25,953 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:25,954 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:25,954 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:25,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,097 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 4 proven. 64 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:44:26,097 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511935935] [2019-10-14 21:44:26,097 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234849855] [2019-10-14 21:44:26,098 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:26,191 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2019-10-14 21:44:26,192 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:26,193 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:44:26,195 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:26,237 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:44:26,237 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:26,237 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:44:26,237 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373151165] [2019-10-14 21:44:26,238 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:44:26,239 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:26,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:44:26,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:26,241 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 13 states. [2019-10-14 21:44:26,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:26,331 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2019-10-14 21:44:26,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:44:26,331 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2019-10-14 21:44:26,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:26,333 INFO L225 Difference]: With dead ends: 96 [2019-10-14 21:44:26,333 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 21:44:26,334 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:26,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 21:44:26,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2019-10-14 21:44:26,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:44:26,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2019-10-14 21:44:26,341 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 54 [2019-10-14 21:44:26,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:26,341 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2019-10-14 21:44:26,341 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:44:26,342 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2019-10-14 21:44:26,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-14 21:44:26,342 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:26,343 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:26,552 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:26,553 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:26,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:26,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1276400018, now seen corresponding path program 6 times [2019-10-14 21:44:26,554 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:26,554 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734181988] [2019-10-14 21:44:26,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:26,555 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:26,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:26,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:26,695 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 4 proven. 81 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:44:26,695 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734181988] [2019-10-14 21:44:26,695 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264425226] [2019-10-14 21:44:26,696 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:26,764 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-10-14 21:44:26,764 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:26,765 INFO L256 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:44:26,768 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:26,910 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2019-10-14 21:44:26,911 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:26,911 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2019-10-14 21:44:26,913 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94082647] [2019-10-14 21:44:26,914 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:44:26,914 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:26,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:44:26,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=253, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:26,915 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand 19 states. [2019-10-14 21:44:27,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:27,201 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2019-10-14 21:44:27,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:44:27,201 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 56 [2019-10-14 21:44:27,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:27,202 INFO L225 Difference]: With dead ends: 112 [2019-10-14 21:44:27,202 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:44:27,203 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:44:27,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:44:27,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-10-14 21:44:27,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-10-14 21:44:27,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2019-10-14 21:44:27,224 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 56 [2019-10-14 21:44:27,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:27,225 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2019-10-14 21:44:27,225 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:44:27,225 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2019-10-14 21:44:27,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-14 21:44:27,230 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:27,230 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:27,431 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:27,431 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:27,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:27,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1488985628, now seen corresponding path program 7 times [2019-10-14 21:44:27,431 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:27,432 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318848063] [2019-10-14 21:44:27,432 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:27,432 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:27,432 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:27,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:27,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:27,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:27,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:44:27,589 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318848063] [2019-10-14 21:44:27,590 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874342243] [2019-10-14 21:44:27,590 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:27,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:27,654 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:44:27,655 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:27,684 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 21:44:27,685 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:27,685 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:44:27,685 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315313604] [2019-10-14 21:44:27,687 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:44:27,687 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:27,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:44:27,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:27,688 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 15 states. [2019-10-14 21:44:27,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:27,778 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2019-10-14 21:44:27,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:44:27,779 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 61 [2019-10-14 21:44:27,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:27,780 INFO L225 Difference]: With dead ends: 106 [2019-10-14 21:44:27,780 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 21:44:27,780 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:27,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 21:44:27,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-10-14 21:44:27,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 21:44:27,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-14 21:44:27,787 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 61 [2019-10-14 21:44:27,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:27,787 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-14 21:44:27,787 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:44:27,788 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-14 21:44:27,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:44:27,788 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:27,789 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:27,994 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:27,995 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:27,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:27,995 INFO L82 PathProgramCache]: Analyzing trace with hash -2139255110, now seen corresponding path program 8 times [2019-10-14 21:44:27,996 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:27,996 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36049085] [2019-10-14 21:44:27,996 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:27,997 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:27,997 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:28,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,179 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 4 proven. 121 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:44:28,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36049085] [2019-10-14 21:44:28,180 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579506046] [2019-10-14 21:44:28,180 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:28,253 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:28,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:28,255 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:44:28,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:28,289 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 21:44:28,289 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:28,289 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:44:28,290 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132769255] [2019-10-14 21:44:28,290 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:44:28,290 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:28,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:44:28,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:28,291 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 16 states. [2019-10-14 21:44:28,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:28,403 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2019-10-14 21:44:28,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:44:28,403 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2019-10-14 21:44:28,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:28,405 INFO L225 Difference]: With dead ends: 108 [2019-10-14 21:44:28,405 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 21:44:28,406 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:28,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 21:44:28,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-10-14 21:44:28,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-10-14 21:44:28,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2019-10-14 21:44:28,412 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 63 [2019-10-14 21:44:28,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:28,413 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2019-10-14 21:44:28,413 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:44:28,413 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2019-10-14 21:44:28,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 21:44:28,414 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:28,414 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:28,618 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:28,619 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:28,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:28,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1365159976, now seen corresponding path program 9 times [2019-10-14 21:44:28,620 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:28,620 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278687476] [2019-10-14 21:44:28,620 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:28,621 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:28,621 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:28,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:28,771 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 4 proven. 144 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:44:28,771 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278687476] [2019-10-14 21:44:28,771 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455483678] [2019-10-14 21:44:28,772 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:28,828 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 21:44:28,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:28,830 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:44:28,832 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:29,115 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:44:29,117 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:29,117 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-10-14 21:44:29,118 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:29,132 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:29,133 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:29,134 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-10-14 21:44:29,157 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-10-14 21:44:29,216 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:29,216 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2019-10-14 21:44:29,216 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350965967] [2019-10-14 21:44:29,217 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:44:29,217 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:29,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:44:29,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=563, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:44:29,219 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 27 states. [2019-10-14 21:44:30,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:30,212 INFO L93 Difference]: Finished difference Result 131 states and 142 transitions. [2019-10-14 21:44:30,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:44:30,213 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 65 [2019-10-14 21:44:30,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:30,214 INFO L225 Difference]: With dead ends: 131 [2019-10-14 21:44:30,214 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:44:30,216 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=421, Invalid=1835, Unknown=0, NotChecked=0, Total=2256 [2019-10-14 21:44:30,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:44:30,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-10-14 21:44:30,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-14 21:44:30,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2019-10-14 21:44:30,223 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 65 [2019-10-14 21:44:30,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:30,223 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2019-10-14 21:44:30,223 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:44:30,223 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2019-10-14 21:44:30,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-10-14 21:44:30,224 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:30,224 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:30,425 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:30,426 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:30,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:30,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1988906486, now seen corresponding path program 10 times [2019-10-14 21:44:30,426 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:30,427 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705995216] [2019-10-14 21:44:30,427 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:30,427 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:30,427 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:30,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:30,613 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 4 proven. 169 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:44:30,613 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705995216] [2019-10-14 21:44:30,613 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581688427] [2019-10-14 21:44:30,613 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:30,668 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:30,668 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:30,670 INFO L256 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:44:30,672 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:30,689 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-14 21:44:30,689 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:30,689 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:44:30,689 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159948938] [2019-10-14 21:44:30,690 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:44:30,690 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:30,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:44:30,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:30,691 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 18 states. [2019-10-14 21:44:30,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:30,830 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2019-10-14 21:44:30,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:44:30,831 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 70 [2019-10-14 21:44:30,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:30,832 INFO L225 Difference]: With dead ends: 118 [2019-10-14 21:44:30,832 INFO L226 Difference]: Without dead ends: 77 [2019-10-14 21:44:30,833 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:30,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-10-14 21:44:30,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-10-14 21:44:30,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 21:44:30,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2019-10-14 21:44:30,839 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 70 [2019-10-14 21:44:30,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:30,839 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2019-10-14 21:44:30,839 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:44:30,839 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2019-10-14 21:44:30,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-14 21:44:30,840 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:30,840 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:31,041 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,041 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:31,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:31,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1707036904, now seen corresponding path program 11 times [2019-10-14 21:44:31,042 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:31,043 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462871617] [2019-10-14 21:44:31,043 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,043 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,044 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:31,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,227 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 4 proven. 196 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:44:31,228 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462871617] [2019-10-14 21:44:31,228 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748327537] [2019-10-14 21:44:31,228 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,368 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2019-10-14 21:44:31,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:31,370 INFO L256 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:44:31,372 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:31,391 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-14 21:44:31,392 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:31,392 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:44:31,392 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601496847] [2019-10-14 21:44:31,392 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:44:31,393 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:31,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:44:31,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:31,393 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 19 states. [2019-10-14 21:44:31,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:31,555 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2019-10-14 21:44:31,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:44:31,557 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 72 [2019-10-14 21:44:31,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:31,558 INFO L225 Difference]: With dead ends: 120 [2019-10-14 21:44:31,558 INFO L226 Difference]: Without dead ends: 79 [2019-10-14 21:44:31,559 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:31,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-14 21:44:31,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2019-10-14 21:44:31,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-10-14 21:44:31,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2019-10-14 21:44:31,567 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 72 [2019-10-14 21:44:31,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:31,567 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2019-10-14 21:44:31,567 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:44:31,567 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2019-10-14 21:44:31,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-10-14 21:44:31,568 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:31,568 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:31,781 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:31,781 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:31,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:31,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1570680902, now seen corresponding path program 12 times [2019-10-14 21:44:31,782 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:31,782 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138097410] [2019-10-14 21:44:31,782 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,783 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:31,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:31,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:31,987 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 4 proven. 225 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:44:31,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138097410] [2019-10-14 21:44:31,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72634013] [2019-10-14 21:44:31,988 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:32,079 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2019-10-14 21:44:32,079 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:32,081 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:44:32,082 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:32,299 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-14 21:44:32,300 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:32,301 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:32,302 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:32,302 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-14 21:44:32,317 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:32,356 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2019-10-14 21:44:32,357 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:32,357 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13] total 30 [2019-10-14 21:44:32,357 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234994755] [2019-10-14 21:44:32,357 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 21:44:32,358 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:32,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 21:44:32,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=690, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:44:32,358 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand 30 states. [2019-10-14 21:44:33,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:33,386 INFO L93 Difference]: Finished difference Result 132 states and 139 transitions. [2019-10-14 21:44:33,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:44:33,387 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2019-10-14 21:44:33,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:33,388 INFO L225 Difference]: With dead ends: 132 [2019-10-14 21:44:33,388 INFO L226 Difference]: Without dead ends: 91 [2019-10-14 21:44:33,390 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=503, Invalid=1947, Unknown=0, NotChecked=0, Total=2450 [2019-10-14 21:44:33,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-14 21:44:33,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2019-10-14 21:44:33,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-14 21:44:33,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2019-10-14 21:44:33,395 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 74 [2019-10-14 21:44:33,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:33,395 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2019-10-14 21:44:33,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 21:44:33,395 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2019-10-14 21:44:33,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-14 21:44:33,396 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:33,396 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:33,600 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:33,600 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:33,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:33,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1734170861, now seen corresponding path program 13 times [2019-10-14 21:44:33,601 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:33,601 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375714604] [2019-10-14 21:44:33,602 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:33,602 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:33,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:33,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,845 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 6 proven. 256 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:44:33,846 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375714604] [2019-10-14 21:44:33,846 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075052155] [2019-10-14 21:44:33,846 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:33,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:33,933 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:44:33,935 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:33,954 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:44:33,954 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:33,954 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:44:33,954 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221770959] [2019-10-14 21:44:33,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:44:33,955 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:33,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:44:33,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:44:33,956 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 21 states. [2019-10-14 21:44:34,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:34,077 INFO L93 Difference]: Finished difference Result 140 states and 146 transitions. [2019-10-14 21:44:34,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:44:34,077 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 84 [2019-10-14 21:44:34,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:34,079 INFO L225 Difference]: With dead ends: 140 [2019-10-14 21:44:34,079 INFO L226 Difference]: Without dead ends: 91 [2019-10-14 21:44:34,080 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:44:34,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-14 21:44:34,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2019-10-14 21:44:34,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-10-14 21:44:34,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2019-10-14 21:44:34,086 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 84 [2019-10-14 21:44:34,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:34,087 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2019-10-14 21:44:34,087 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:44:34,087 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2019-10-14 21:44:34,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-10-14 21:44:34,088 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:34,088 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:34,291 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:34,291 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:34,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:34,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1136485557, now seen corresponding path program 14 times [2019-10-14 21:44:34,292 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:34,292 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411475752] [2019-10-14 21:44:34,292 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,292 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,292 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:34,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,536 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 6 proven. 289 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:44:34,536 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411475752] [2019-10-14 21:44:34,536 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686352843] [2019-10-14 21:44:34,537 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:34,627 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:34,628 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:34,629 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:44:34,631 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:34,650 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:44:34,651 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:34,651 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:44:34,652 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851510789] [2019-10-14 21:44:34,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:44:34,657 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:34,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:44:34,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:44:34,658 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand 22 states. [2019-10-14 21:44:34,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:34,820 INFO L93 Difference]: Finished difference Result 142 states and 148 transitions. [2019-10-14 21:44:34,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:44:34,820 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 86 [2019-10-14 21:44:34,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:34,822 INFO L225 Difference]: With dead ends: 142 [2019-10-14 21:44:34,822 INFO L226 Difference]: Without dead ends: 93 [2019-10-14 21:44:34,823 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:44:34,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-10-14 21:44:34,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2019-10-14 21:44:34,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-14 21:44:34,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 95 transitions. [2019-10-14 21:44:34,831 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 95 transitions. Word has length 86 [2019-10-14 21:44:34,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:34,831 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 95 transitions. [2019-10-14 21:44:34,831 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:44:34,831 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 95 transitions. [2019-10-14 21:44:34,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-10-14 21:44:34,832 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:34,832 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:35,036 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,037 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:35,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:35,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1826668073, now seen corresponding path program 15 times [2019-10-14 21:44:35,038 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:35,038 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200659898] [2019-10-14 21:44:35,038 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,038 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,039 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:35,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,296 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 6 proven. 324 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:44:35,296 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200659898] [2019-10-14 21:44:35,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998690780] [2019-10-14 21:44:35,297 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,375 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-14 21:44:35,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:35,376 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 21:44:35,379 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:35,689 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:44:35,691 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:35,692 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-10-14 21:44:35,693 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:35,700 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:35,701 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:35,701 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-10-14 21:44:35,722 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:35,782 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 21 proven. 33 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2019-10-14 21:44:35,783 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:35,783 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15] total 35 [2019-10-14 21:44:35,783 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660670439] [2019-10-14 21:44:35,784 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 21:44:35,784 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:35,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 21:44:35,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:44:35,785 INFO L87 Difference]: Start difference. First operand 92 states and 95 transitions. Second operand 35 states. [2019-10-14 21:44:39,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:39,438 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2019-10-14 21:44:39,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-14 21:44:39,440 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 88 [2019-10-14 21:44:39,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:39,441 INFO L225 Difference]: With dead ends: 169 [2019-10-14 21:44:39,441 INFO L226 Difference]: Without dead ends: 98 [2019-10-14 21:44:39,444 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=800, Invalid=3232, Unknown=0, NotChecked=0, Total=4032 [2019-10-14 21:44:39,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-10-14 21:44:39,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-10-14 21:44:39,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-10-14 21:44:39,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2019-10-14 21:44:39,454 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 88 [2019-10-14 21:44:39,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:39,454 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2019-10-14 21:44:39,454 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 21:44:39,454 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2019-10-14 21:44:39,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-14 21:44:39,456 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:39,456 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:39,657 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:39,657 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:39,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:39,658 INFO L82 PathProgramCache]: Analyzing trace with hash -553957407, now seen corresponding path program 16 times [2019-10-14 21:44:39,658 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:39,658 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880070173] [2019-10-14 21:44:39,659 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,659 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,659 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:39,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,915 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 6 proven. 361 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:44:39,915 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880070173] [2019-10-14 21:44:39,915 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838370546] [2019-10-14 21:44:39,916 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,032 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:40,032 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:40,034 INFO L256 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:44:40,036 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:40,054 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:44:40,055 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:40,055 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-14 21:44:40,055 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952556443] [2019-10-14 21:44:40,056 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:44:40,056 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:40,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:44:40,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:44:40,057 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 24 states. [2019-10-14 21:44:40,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:40,225 INFO L93 Difference]: Finished difference Result 152 states and 158 transitions. [2019-10-14 21:44:40,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:44:40,225 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2019-10-14 21:44:40,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:40,226 INFO L225 Difference]: With dead ends: 152 [2019-10-14 21:44:40,226 INFO L226 Difference]: Without dead ends: 100 [2019-10-14 21:44:40,230 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:44:40,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-10-14 21:44:40,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2019-10-14 21:44:40,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-10-14 21:44:40,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2019-10-14 21:44:40,241 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 93 [2019-10-14 21:44:40,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:40,241 INFO L462 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2019-10-14 21:44:40,241 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 21:44:40,242 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2019-10-14 21:44:40,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-14 21:44:40,242 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:40,242 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:40,453 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,454 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:40,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:40,454 INFO L82 PathProgramCache]: Analyzing trace with hash -534855553, now seen corresponding path program 17 times [2019-10-14 21:44:40,455 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:40,455 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215638476] [2019-10-14 21:44:40,455 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,455 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,456 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:40,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,717 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 6 proven. 400 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:44:40,717 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215638476] [2019-10-14 21:44:40,717 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991789427] [2019-10-14 21:44:40,717 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:41,083 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-10-14 21:44:41,083 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:41,086 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 21:44:41,087 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:41,108 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:44:41,108 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:41,109 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-14 21:44:41,109 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84942834] [2019-10-14 21:44:41,109 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:44:41,109 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:41,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:44:41,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:44:41,110 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 25 states. [2019-10-14 21:44:41,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:41,200 INFO L93 Difference]: Finished difference Result 154 states and 160 transitions. [2019-10-14 21:44:41,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 21:44:41,200 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 95 [2019-10-14 21:44:41,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:41,202 INFO L225 Difference]: With dead ends: 154 [2019-10-14 21:44:41,202 INFO L226 Difference]: Without dead ends: 102 [2019-10-14 21:44:41,202 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:44:41,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-10-14 21:44:41,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2019-10-14 21:44:41,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-10-14 21:44:41,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2019-10-14 21:44:41,207 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 95 [2019-10-14 21:44:41,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:41,208 INFO L462 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2019-10-14 21:44:41,208 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:44:41,208 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2019-10-14 21:44:41,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-14 21:44:41,209 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:41,209 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:41,415 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:41,415 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:41,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:41,415 INFO L82 PathProgramCache]: Analyzing trace with hash 642156957, now seen corresponding path program 18 times [2019-10-14 21:44:41,415 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:41,416 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301367575] [2019-10-14 21:44:41,416 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:41,416 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:41,416 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:41,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,843 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 6 proven. 441 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 21:44:41,843 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301367575] [2019-10-14 21:44:41,843 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651624134] [2019-10-14 21:44:41,844 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:42,009 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-10-14 21:44:42,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:42,011 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 21:44:42,014 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:42,259 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-14 21:44:42,259 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:42,260 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:42,260 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:42,261 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-14 21:44:42,279 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:42,344 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 6 proven. 60 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2019-10-14 21:44:42,344 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:42,344 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 15] total 38 [2019-10-14 21:44:42,345 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897475834] [2019-10-14 21:44:42,345 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-14 21:44:42,345 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:42,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-14 21:44:42,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1098, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 21:44:42,346 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 38 states. [2019-10-14 21:44:43,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:43,776 INFO L93 Difference]: Finished difference Result 166 states and 173 transitions. [2019-10-14 21:44:43,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-14 21:44:43,777 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 97 [2019-10-14 21:44:43,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:43,778 INFO L225 Difference]: With dead ends: 166 [2019-10-14 21:44:43,778 INFO L226 Difference]: Without dead ends: 114 [2019-10-14 21:44:43,780 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=877, Invalid=3155, Unknown=0, NotChecked=0, Total=4032 [2019-10-14 21:44:43,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-14 21:44:43,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2019-10-14 21:44:43,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-10-14 21:44:43,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2019-10-14 21:44:43,785 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 97 [2019-10-14 21:44:43,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:43,786 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2019-10-14 21:44:43,786 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-14 21:44:43,786 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2019-10-14 21:44:43,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-10-14 21:44:43,787 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:43,787 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:43,987 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:43,988 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:43,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:43,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1729557646, now seen corresponding path program 19 times [2019-10-14 21:44:43,989 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:43,989 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676923852] [2019-10-14 21:44:43,989 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:43,989 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:43,990 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:44,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,307 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 8 proven. 484 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-10-14 21:44:44,308 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676923852] [2019-10-14 21:44:44,308 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762972092] [2019-10-14 21:44:44,308 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:44,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,395 INFO L256 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:44:44,400 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:44,420 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-10-14 21:44:44,420 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:44,420 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-14 21:44:44,420 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768351352] [2019-10-14 21:44:44,421 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:44:44,421 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:44,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:44:44,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:44:44,421 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand 27 states. [2019-10-14 21:44:44,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:44,591 INFO L93 Difference]: Finished difference Result 174 states and 180 transitions. [2019-10-14 21:44:44,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:44:44,592 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 107 [2019-10-14 21:44:44,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:44,593 INFO L225 Difference]: With dead ends: 174 [2019-10-14 21:44:44,593 INFO L226 Difference]: Without dead ends: 114 [2019-10-14 21:44:44,593 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:44:44,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-14 21:44:44,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2019-10-14 21:44:44,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2019-10-14 21:44:44,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2019-10-14 21:44:44,599 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 107 [2019-10-14 21:44:44,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:44,600 INFO L462 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2019-10-14 21:44:44,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:44:44,600 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2019-10-14 21:44:44,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2019-10-14 21:44:44,601 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:44,601 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:44,804 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:44,805 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:44,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:44,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1341778032, now seen corresponding path program 20 times [2019-10-14 21:44:44,806 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:44,806 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206869313] [2019-10-14 21:44:44,806 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:44,806 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:44,807 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:44,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,154 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 8 proven. 529 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-10-14 21:44:45,154 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206869313] [2019-10-14 21:44:45,155 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983589734] [2019-10-14 21:44:45,155 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:45,243 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:45,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:45,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 21:44:45,246 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:45,266 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-10-14 21:44:45,267 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:45,267 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-10-14 21:44:45,267 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001978495] [2019-10-14 21:44:45,268 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 21:44:45,268 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:45,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 21:44:45,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 21:44:45,269 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand 28 states. [2019-10-14 21:44:45,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:45,474 INFO L93 Difference]: Finished difference Result 176 states and 182 transitions. [2019-10-14 21:44:45,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 21:44:45,474 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2019-10-14 21:44:45,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:45,476 INFO L225 Difference]: With dead ends: 176 [2019-10-14 21:44:45,476 INFO L226 Difference]: Without dead ends: 116 [2019-10-14 21:44:45,477 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 21:44:45,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-10-14 21:44:45,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-10-14 21:44:45,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-10-14 21:44:45,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 118 transitions. [2019-10-14 21:44:45,483 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 118 transitions. Word has length 109 [2019-10-14 21:44:45,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:45,483 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 118 transitions. [2019-10-14 21:44:45,483 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 21:44:45,483 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 118 transitions. [2019-10-14 21:44:45,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-14 21:44:45,484 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:45,484 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:45,688 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:45,689 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:45,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:45,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1947243566, now seen corresponding path program 21 times [2019-10-14 21:44:45,689 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:45,690 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773252381] [2019-10-14 21:44:45,690 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:45,690 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:45,690 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:45,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:46,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:46,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:46,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:46,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:46,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:46,253 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 8 proven. 576 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-10-14 21:44:46,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773252381] [2019-10-14 21:44:46,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520025662] [2019-10-14 21:44:46,254 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:46,402 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:44:46,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:46,405 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:44:46,409 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:47,062 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:44:47,065 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:47,066 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-10-14 21:44:47,066 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:47,077 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:47,078 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:47,078 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-10-14 21:44:47,118 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:47,228 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-10-14 21:44:47,228 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:47,228 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 17] total 43 [2019-10-14 21:44:47,228 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018778976] [2019-10-14 21:44:47,229 INFO L442 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-10-14 21:44:47,231 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:47,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-10-14 21:44:47,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1397, Unknown=0, NotChecked=0, Total=1806 [2019-10-14 21:44:47,232 INFO L87 Difference]: Start difference. First operand 115 states and 118 transitions. Second operand 43 states. [2019-10-14 21:44:49,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:49,903 INFO L93 Difference]: Finished difference Result 207 states and 220 transitions. [2019-10-14 21:44:49,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-10-14 21:44:49,903 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 111 [2019-10-14 21:44:49,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:49,905 INFO L225 Difference]: With dead ends: 207 [2019-10-14 21:44:49,905 INFO L226 Difference]: Without dead ends: 121 [2019-10-14 21:44:49,908 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1306, Invalid=5014, Unknown=0, NotChecked=0, Total=6320 [2019-10-14 21:44:49,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2019-10-14 21:44:49,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2019-10-14 21:44:49,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-10-14 21:44:49,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2019-10-14 21:44:49,915 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 111 [2019-10-14 21:44:49,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:49,916 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2019-10-14 21:44:49,916 INFO L463 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-10-14 21:44:49,916 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2019-10-14 21:44:49,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-10-14 21:44:49,916 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:49,917 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:50,121 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:50,121 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:50,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:50,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1920998396, now seen corresponding path program 22 times [2019-10-14 21:44:50,122 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:50,122 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15008801] [2019-10-14 21:44:50,122 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:50,122 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:50,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:50,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:50,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:50,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:50,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:50,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:50,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:50,529 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 8 proven. 625 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-14 21:44:50,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15008801] [2019-10-14 21:44:50,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832478702] [2019-10-14 21:44:50,530 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:50,638 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:50,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:50,640 INFO L256 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 21:44:50,643 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:50,727 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2019-10-14 21:44:50,728 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:50,728 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-10-14 21:44:50,728 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880922343] [2019-10-14 21:44:50,729 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 21:44:50,729 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:50,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 21:44:50,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:44:50,731 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 30 states. [2019-10-14 21:44:51,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:51,004 INFO L93 Difference]: Finished difference Result 186 states and 192 transitions. [2019-10-14 21:44:51,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:44:51,004 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 116 [2019-10-14 21:44:51,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:51,006 INFO L225 Difference]: With dead ends: 186 [2019-10-14 21:44:51,006 INFO L226 Difference]: Without dead ends: 123 [2019-10-14 21:44:51,007 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:44:51,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2019-10-14 21:44:51,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2019-10-14 21:44:51,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2019-10-14 21:44:51,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 125 transitions. [2019-10-14 21:44:51,015 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 125 transitions. Word has length 116 [2019-10-14 21:44:51,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:51,016 INFO L462 AbstractCegarLoop]: Abstraction has 122 states and 125 transitions. [2019-10-14 21:44:51,016 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 21:44:51,016 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 125 transitions. [2019-10-14 21:44:51,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-10-14 21:44:51,017 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:51,018 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:51,223 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:51,223 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:51,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:51,224 INFO L82 PathProgramCache]: Analyzing trace with hash 501993886, now seen corresponding path program 23 times [2019-10-14 21:44:51,224 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:51,225 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106689981] [2019-10-14 21:44:51,225 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:51,225 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:51,225 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:51,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:51,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:51,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:51,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:51,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:51,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:51,637 INFO L134 CoverageAnalysis]: Checked inductivity of 803 backedges. 8 proven. 676 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-14 21:44:51,637 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106689981] [2019-10-14 21:44:51,638 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544674425] [2019-10-14 21:44:51,638 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:52,188 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2019-10-14 21:44:52,189 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:52,192 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:44:52,195 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:52,223 INFO L134 CoverageAnalysis]: Checked inductivity of 803 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2019-10-14 21:44:52,223 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:52,224 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-10-14 21:44:52,224 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607926066] [2019-10-14 21:44:52,225 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 21:44:52,225 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:52,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 21:44:52,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:44:52,226 INFO L87 Difference]: Start difference. First operand 122 states and 125 transitions. Second operand 31 states. [2019-10-14 21:44:52,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:52,421 INFO L93 Difference]: Finished difference Result 188 states and 194 transitions. [2019-10-14 21:44:52,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:44:52,422 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 118 [2019-10-14 21:44:52,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:52,423 INFO L225 Difference]: With dead ends: 188 [2019-10-14 21:44:52,423 INFO L226 Difference]: Without dead ends: 125 [2019-10-14 21:44:52,424 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:44:52,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-10-14 21:44:52,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-10-14 21:44:52,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-10-14 21:44:52,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2019-10-14 21:44:52,432 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 118 [2019-10-14 21:44:52,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:52,433 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2019-10-14 21:44:52,433 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 21:44:52,433 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2019-10-14 21:44:52,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-10-14 21:44:52,434 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:52,434 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:52,640 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:52,641 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:52,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:52,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1656707392, now seen corresponding path program 24 times [2019-10-14 21:44:52,642 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:52,642 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016392962] [2019-10-14 21:44:52,642 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:52,643 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:52,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:52,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:53,309 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 8 proven. 729 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-10-14 21:44:53,310 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016392962] [2019-10-14 21:44:53,310 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449969980] [2019-10-14 21:44:53,310 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:53,577 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 21:44:53,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:53,579 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 36 conjunts are in the unsatisfiable core [2019-10-14 21:44:53,582 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:53,937 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-14 21:44:53,937 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:53,939 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:53,939 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:53,939 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-14 21:44:53,962 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:54,029 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 8 proven. 92 refuted. 0 times theorem prover too weak. 756 trivial. 0 not checked. [2019-10-14 21:44:54,029 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:54,030 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 17] total 46 [2019-10-14 21:44:54,030 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390162046] [2019-10-14 21:44:54,030 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-10-14 21:44:54,030 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:54,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-10-14 21:44:54,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=1598, Unknown=0, NotChecked=0, Total=2070 [2019-10-14 21:44:54,032 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand 46 states. [2019-10-14 21:44:55,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:55,966 INFO L93 Difference]: Finished difference Result 200 states and 207 transitions. [2019-10-14 21:44:55,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-14 21:44:55,966 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 120 [2019-10-14 21:44:55,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:55,968 INFO L225 Difference]: With dead ends: 200 [2019-10-14 21:44:55,968 INFO L226 Difference]: Without dead ends: 137 [2019-10-14 21:44:55,970 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1097 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1359, Invalid=4647, Unknown=0, NotChecked=0, Total=6006 [2019-10-14 21:44:55,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-10-14 21:44:55,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 134. [2019-10-14 21:44:55,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-10-14 21:44:55,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 137 transitions. [2019-10-14 21:44:55,976 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 137 transitions. Word has length 120 [2019-10-14 21:44:55,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:55,976 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 137 transitions. [2019-10-14 21:44:55,976 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-10-14 21:44:55,977 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 137 transitions. [2019-10-14 21:44:55,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-10-14 21:44:55,979 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:55,979 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:56,183 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:56,184 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:56,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:56,184 INFO L82 PathProgramCache]: Analyzing trace with hash -323867495, now seen corresponding path program 25 times [2019-10-14 21:44:56,185 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:56,185 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272751805] [2019-10-14 21:44:56,185 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:56,185 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:56,185 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:56,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,688 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 10 proven. 784 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-14 21:44:56,688 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272751805] [2019-10-14 21:44:56,688 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091350465] [2019-10-14 21:44:56,688 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:56,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:56,787 INFO L256 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 21:44:56,789 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:56,812 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-10-14 21:44:56,812 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:56,812 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-10-14 21:44:56,812 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921383866] [2019-10-14 21:44:56,813 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 21:44:56,813 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:56,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 21:44:56,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:44:56,814 INFO L87 Difference]: Start difference. First operand 134 states and 137 transitions. Second operand 33 states. [2019-10-14 21:44:56,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:56,968 INFO L93 Difference]: Finished difference Result 208 states and 214 transitions. [2019-10-14 21:44:56,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 21:44:56,969 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 130 [2019-10-14 21:44:56,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:56,970 INFO L225 Difference]: With dead ends: 208 [2019-10-14 21:44:56,971 INFO L226 Difference]: Without dead ends: 137 [2019-10-14 21:44:56,972 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:44:56,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-10-14 21:44:56,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-10-14 21:44:56,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-10-14 21:44:56,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 139 transitions. [2019-10-14 21:44:56,979 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 139 transitions. Word has length 130 [2019-10-14 21:44:56,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:56,979 INFO L462 AbstractCegarLoop]: Abstraction has 136 states and 139 transitions. [2019-10-14 21:44:56,979 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 21:44:56,979 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 139 transitions. [2019-10-14 21:44:56,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-10-14 21:44:56,980 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:56,980 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:57,184 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:57,185 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:57,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:57,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1076470085, now seen corresponding path program 26 times [2019-10-14 21:44:57,185 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:57,186 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528910790] [2019-10-14 21:44:57,186 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:57,186 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:57,186 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:57,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:57,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1004 backedges. 10 proven. 841 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-14 21:44:57,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528910790] [2019-10-14 21:44:57,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650792095] [2019-10-14 21:44:57,744 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:57,859 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:57,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:57,861 INFO L256 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-14 21:44:57,864 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:57,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1004 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-10-14 21:44:57,903 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:57,903 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-10-14 21:44:57,903 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983816888] [2019-10-14 21:44:57,904 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 21:44:57,905 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:57,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 21:44:57,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:44:57,906 INFO L87 Difference]: Start difference. First operand 136 states and 139 transitions. Second operand 34 states. [2019-10-14 21:44:58,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:58,093 INFO L93 Difference]: Finished difference Result 210 states and 216 transitions. [2019-10-14 21:44:58,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-14 21:44:58,093 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 132 [2019-10-14 21:44:58,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:58,095 INFO L225 Difference]: With dead ends: 210 [2019-10-14 21:44:58,095 INFO L226 Difference]: Without dead ends: 139 [2019-10-14 21:44:58,096 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:44:58,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-10-14 21:44:58,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2019-10-14 21:44:58,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2019-10-14 21:44:58,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 141 transitions. [2019-10-14 21:44:58,104 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 141 transitions. Word has length 132 [2019-10-14 21:44:58,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:58,104 INFO L462 AbstractCegarLoop]: Abstraction has 138 states and 141 transitions. [2019-10-14 21:44:58,104 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 21:44:58,104 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 141 transitions. [2019-10-14 21:44:58,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2019-10-14 21:44:58,105 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:58,105 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:58,309 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:58,310 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:58,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:58,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1521913949, now seen corresponding path program 27 times [2019-10-14 21:44:58,310 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:58,310 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488317135] [2019-10-14 21:44:58,311 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:58,311 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:58,311 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:58,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:58,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 10 proven. 900 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-10-14 21:44:58,826 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488317135] [2019-10-14 21:44:58,826 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245937079] [2019-10-14 21:44:58,827 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:58,941 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-10-14 21:44:58,942 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:58,943 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 38 conjunts are in the unsatisfiable core [2019-10-14 21:44:58,945 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:59,362 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2019-10-14 21:44:59,362 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:44:59,363 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:44:59,364 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:44:59,364 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:4 [2019-10-14 21:44:59,390 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:44:59,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 10 proven. 113 refuted. 0 times theorem prover too weak. 940 trivial. 0 not checked. [2019-10-14 21:44:59,462 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:59,462 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 19] total 51 [2019-10-14 21:44:59,462 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450073700] [2019-10-14 21:44:59,463 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-10-14 21:44:59,463 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:59,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-10-14 21:44:59,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=1979, Unknown=0, NotChecked=0, Total=2550 [2019-10-14 21:44:59,465 INFO L87 Difference]: Start difference. First operand 138 states and 141 transitions. Second operand 51 states.