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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:33:20,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:33:20,864 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:33:20,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:33:20,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:33:20,880 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:33:20,881 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:33:20,883 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:33:20,893 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:33:20,894 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:33:20,895 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:33:20,896 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:33:20,896 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:33:20,897 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:33:20,898 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:33:20,899 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:33:20,900 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:33:20,901 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:33:20,903 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:33:20,905 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:33:20,906 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:33:20,907 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:33:20,908 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:33:20,909 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:33:20,911 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:33:20,918 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:33:20,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:33:20,919 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:33:20,920 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 [2019-10-15 01:33:20,940 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:33:20,941 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:33:20,943 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:33:20,943 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:33:20,943 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:33:20,943 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:33:20,944 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:33:20,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:33:20,944 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:33:20,944 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:33:20,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:33:20,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:33:20,946 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:33:20,946 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:33:20,946 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:33:20,946 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:33:20,946 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:33:20,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:33:20,947 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:33:20,947 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:33:20,947 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:33:20,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:33:20,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:33:20,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:33:20,948 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:33:20,948 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:33:20,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:33:20,949 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:33:20,949 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:33:21,214 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:33:21,232 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:33:21,236 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:33:21,237 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:33:21,237 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:33:21,238 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-10-15 01:33:21,303 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e225d771/02d11b06d03645c7b88042c0f4c11a5a/FLAG87e6fc714 [2019-10-15 01:33:21,730 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:33:21,731 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-10-15 01:33:21,739 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e225d771/02d11b06d03645c7b88042c0f4c11a5a/FLAG87e6fc714 [2019-10-15 01:33:22,137 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e225d771/02d11b06d03645c7b88042c0f4c11a5a [2019-10-15 01:33:22,147 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:33:22,149 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:33:22,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:33:22,150 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:33:22,153 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:33:22,154 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,157 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9ea241b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22, skipping insertion in model container [2019-10-15 01:33:22,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,164 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:33:22,181 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:33:22,367 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:33:22,370 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:33:22,387 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:33:22,404 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:33:22,405 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22 WrapperNode [2019-10-15 01:33:22,405 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:33:22,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:33:22,406 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:33:22,406 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:33:22,493 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,502 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,503 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,510 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,516 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,517 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (1/1) ... [2019-10-15 01:33:22,519 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:33:22,519 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:33:22,519 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:33:22,520 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:33:22,520 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (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 [2019-10-15 01:33:22,575 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:33:22,575 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:33:22,576 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:33:22,576 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:33:22,576 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:33:22,576 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:33:22,576 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:33:22,576 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:33:22,577 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:33:22,577 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:33:22,577 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:33:22,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:33:22,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:33:22,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:33:22,928 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:33:22,928 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 01:33:22,930 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:33:22 BoogieIcfgContainer [2019-10-15 01:33:22,930 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:33:22,931 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:33:22,931 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:33:22,934 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:33:22,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:33:22" (1/3) ... [2019-10-15 01:33:22,935 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1864da05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:33:22, skipping insertion in model container [2019-10-15 01:33:22,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:33:22" (2/3) ... [2019-10-15 01:33:22,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1864da05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:33:22, skipping insertion in model container [2019-10-15 01:33:22,936 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:33:22" (3/3) ... [2019-10-15 01:33:22,937 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_find_ground-1.i [2019-10-15 01:33:22,947 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:33:22,955 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:33:22,966 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:33:22,988 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:33:22,989 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:33:22,989 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:33:22,989 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:33:22,989 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:33:22,989 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:33:22,989 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:33:22,990 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:33:23,003 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-10-15 01:33:23,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:33:23,008 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:23,009 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:23,010 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:23,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:23,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1508760786, now seen corresponding path program 1 times [2019-10-15 01:33:23,025 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:23,025 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576880874] [2019-10-15 01:33:23,026 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,026 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,026 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:23,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:23,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:33:23,140 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576880874] [2019-10-15 01:33:23,140 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:33:23,141 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 01:33:23,141 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932590584] [2019-10-15 01:33:23,145 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 01:33:23,146 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:23,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 01:33:23,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 01:33:23,165 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2019-10-15 01:33:23,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:23,192 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2019-10-15 01:33:23,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 01:33:23,194 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2019-10-15 01:33:23,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:23,203 INFO L225 Difference]: With dead ends: 34 [2019-10-15 01:33:23,203 INFO L226 Difference]: Without dead ends: 18 [2019-10-15 01:33:23,209 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 01:33:23,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-15 01:33:23,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-15 01:33:23,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:33:23,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-15 01:33:23,262 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-10-15 01:33:23,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:23,262 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-15 01:33:23,263 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 01:33:23,263 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-15 01:33:23,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:33:23,264 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:23,265 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:23,266 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:23,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:23,267 INFO L82 PathProgramCache]: Analyzing trace with hash 1117724220, now seen corresponding path program 1 times [2019-10-15 01:33:23,268 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:23,269 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730621132] [2019-10-15 01:33:23,269 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,269 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,270 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:23,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:23,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:33:23,411 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730621132] [2019-10-15 01:33:23,411 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:33:23,412 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:33:23,412 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186356049] [2019-10-15 01:33:23,415 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:33:23,416 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:23,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:33:23,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:33:23,417 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2019-10-15 01:33:23,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:23,438 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2019-10-15 01:33:23,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:33:23,439 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-15 01:33:23,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:23,440 INFO L225 Difference]: With dead ends: 31 [2019-10-15 01:33:23,441 INFO L226 Difference]: Without dead ends: 19 [2019-10-15 01:33:23,442 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:33:23,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-15 01:33:23,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-15 01:33:23,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-15 01:33:23,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-10-15 01:33:23,453 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2019-10-15 01:33:23,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:23,453 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-10-15 01:33:23,454 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:33:23,454 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-10-15 01:33:23,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:33:23,456 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:23,457 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:23,457 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:23,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:23,458 INFO L82 PathProgramCache]: Analyzing trace with hash -578316820, now seen corresponding path program 1 times [2019-10-15 01:33:23,458 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:23,459 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039521262] [2019-10-15 01:33:23,460 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,460 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,460 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:23,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:23,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:33:23,607 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039521262] [2019-10-15 01:33:23,608 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:33:23,608 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:33:23,609 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373312823] [2019-10-15 01:33:23,609 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:33:23,610 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:23,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:33:23,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:33:23,611 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-10-15 01:33:23,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:23,635 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2019-10-15 01:33:23,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:33:23,636 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-15 01:33:23,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:23,637 INFO L225 Difference]: With dead ends: 32 [2019-10-15 01:33:23,637 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 01:33:23,638 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:33:23,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 01:33:23,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 01:33:23,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:33:23,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-15 01:33:23,643 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2019-10-15 01:33:23,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:23,644 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-15 01:33:23,644 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:33:23,644 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-15 01:33:23,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:33:23,645 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:23,645 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:23,646 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:23,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:23,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1210330239, now seen corresponding path program 1 times [2019-10-15 01:33:23,646 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:23,647 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331072067] [2019-10-15 01:33:23,647 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,647 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:23,647 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:23,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:23,712 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:33:23,712 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331072067] [2019-10-15 01:33:23,713 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124084868] [2019-10-15 01:33:23,713 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 [2019-10-15 01:33:23,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:23,776 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:33:23,781 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:23,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:33:23,808 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:23,836 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:33:23,836 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1653740419] [2019-10-15 01:33:23,860 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:33:23,861 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:23,867 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:23,874 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:23,875 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:24,087 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:24,314 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2019-10-15 01:33:24,329 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:24,347 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:24,808 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:24,808 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 12] total 18 [2019-10-15 01:33:24,809 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762253037] [2019-10-15 01:33:24,810 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:33:24,810 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:24,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:33:24,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:33:24,812 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 18 states. [2019-10-15 01:33:25,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:25,407 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-10-15 01:33:25,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:33:25,408 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 17 [2019-10-15 01:33:25,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:25,411 INFO L225 Difference]: With dead ends: 41 [2019-10-15 01:33:25,411 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 01:33:25,417 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=148, Invalid=722, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:33:25,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 01:33:25,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2019-10-15 01:33:25,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:33:25,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-15 01:33:25,439 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-10-15 01:33:25,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:25,439 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-15 01:33:25,439 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:33:25,439 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-15 01:33:25,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:33:25,440 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:25,440 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:25,641 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:25,641 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:25,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:25,642 INFO L82 PathProgramCache]: Analyzing trace with hash -884454193, now seen corresponding path program 2 times [2019-10-15 01:33:25,642 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:25,642 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034147273] [2019-10-15 01:33:25,643 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:25,643 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:25,643 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:25,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:25,730 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:33:25,730 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034147273] [2019-10-15 01:33:25,731 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034758915] [2019-10-15 01:33:25,731 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 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 [2019-10-15 01:33:25,783 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:33:25,784 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:33:25,785 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-15 01:33:25,787 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:25,902 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:33:25,903 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:33:26,037 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1217685587] [2019-10-15 01:33:26,039 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:33:26,039 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:26,039 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:26,039 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:26,040 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:26,078 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:26,225 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2019-10-15 01:33:26,245 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:26,251 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:26,846 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:26,846 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 12] total 31 [2019-10-15 01:33:26,847 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159199458] [2019-10-15 01:33:26,848 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-15 01:33:26,848 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:26,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-15 01:33:26,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=837, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:33:26,849 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 31 states. [2019-10-15 01:33:28,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:28,139 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2019-10-15 01:33:28,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:33:28,140 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 20 [2019-10-15 01:33:28,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:28,141 INFO L225 Difference]: With dead ends: 44 [2019-10-15 01:33:28,141 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 01:33:28,143 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=290, Invalid=2160, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 01:33:28,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 01:33:28,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-10-15 01:33:28,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:33:28,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-10-15 01:33:28,150 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2019-10-15 01:33:28,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:28,150 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-10-15 01:33:28,150 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-15 01:33:28,150 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-10-15 01:33:28,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:33:28,152 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:28,152 INFO L380 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:28,355 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:28,356 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:28,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:28,357 INFO L82 PathProgramCache]: Analyzing trace with hash 647347453, now seen corresponding path program 1 times [2019-10-15 01:33:28,358 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:28,358 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493468289] [2019-10-15 01:33:28,359 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:28,359 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:28,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:28,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:28,458 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:33:28,458 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493468289] [2019-10-15 01:33:28,459 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991047838] [2019-10-15 01:33:28,459 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-15 01:33:28,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:28,540 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:33:28,546 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:28,569 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:33:28,570 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:28,667 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:33:28,668 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453135116] [2019-10-15 01:33:28,670 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:33:28,670 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:28,670 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:28,671 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:28,671 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:28,703 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:28,930 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:33:28,955 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:28,963 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:29,423 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:29,425 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 14] total 28 [2019-10-15 01:33:29,425 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297407503] [2019-10-15 01:33:29,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-15 01:33:29,428 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:29,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-15 01:33:29,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=610, Unknown=0, NotChecked=0, Total=756 [2019-10-15 01:33:29,429 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 28 states. [2019-10-15 01:33:30,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:30,419 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2019-10-15 01:33:30,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-15 01:33:30,420 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2019-10-15 01:33:30,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:30,423 INFO L225 Difference]: With dead ends: 54 [2019-10-15 01:33:30,423 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 01:33:30,425 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=415, Invalid=2035, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 01:33:30,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 01:33:30,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-15 01:33:30,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:33:30,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2019-10-15 01:33:30,433 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 28 [2019-10-15 01:33:30,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:30,433 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2019-10-15 01:33:30,433 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-15 01:33:30,434 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2019-10-15 01:33:30,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-15 01:33:30,435 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:30,435 INFO L380 BasicCegarLoop]: trace histogram [12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:30,641 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:30,642 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:30,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:30,643 INFO L82 PathProgramCache]: Analyzing trace with hash 827219629, now seen corresponding path program 2 times [2019-10-15 01:33:30,643 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:30,643 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174597508] [2019-10-15 01:33:30,643 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:30,643 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:30,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:30,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:30,789 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:33:30,790 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174597508] [2019-10-15 01:33:30,790 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410525571] [2019-10-15 01:33:30,790 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 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 [2019-10-15 01:33:30,859 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:33:30,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:33:30,860 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:33:30,862 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:30,918 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-15 01:33:30,918 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:30,975 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-15 01:33:30,975 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047141863] [2019-10-15 01:33:30,977 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:33:30,977 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:30,978 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:30,978 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:30,978 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:31,024 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:31,206 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:33:31,235 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:31,246 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:31,836 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:31,836 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6, 14] total 34 [2019-10-15 01:33:31,836 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199539010] [2019-10-15 01:33:31,838 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-15 01:33:31,838 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:31,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-15 01:33:31,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=956, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:33:31,840 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 34 states. [2019-10-15 01:33:33,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:33,889 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2019-10-15 01:33:33,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-15 01:33:33,890 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 35 [2019-10-15 01:33:33,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:33,891 INFO L225 Difference]: With dead ends: 62 [2019-10-15 01:33:33,891 INFO L226 Difference]: Without dead ends: 39 [2019-10-15 01:33:33,893 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1003 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=598, Invalid=3562, Unknown=0, NotChecked=0, Total=4160 [2019-10-15 01:33:33,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-15 01:33:33,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-10-15 01:33:33,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-15 01:33:33,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-10-15 01:33:33,901 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2019-10-15 01:33:33,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:33,901 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-10-15 01:33:33,901 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-15 01:33:33,901 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-10-15 01:33:33,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-15 01:33:33,903 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:33,903 INFO L380 BasicCegarLoop]: trace histogram [13, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:34,106 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:34,107 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:34,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:34,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1326599222, now seen corresponding path program 3 times [2019-10-15 01:33:34,107 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:34,108 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129776514] [2019-10-15 01:33:34,108 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:34,108 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:34,109 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:34,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:34,290 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:33:34,290 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129776514] [2019-10-15 01:33:34,290 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218520894] [2019-10-15 01:33:34,291 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 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 [2019-10-15 01:33:34,380 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:33:34,381 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:33:34,382 INFO L256 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-15 01:33:34,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:34,406 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:33:34,407 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:34,786 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:33:34,787 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713163439] [2019-10-15 01:33:34,788 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:33:34,788 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:34,789 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:34,789 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:34,789 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:34,816 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:34,922 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:33:34,936 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:34,939 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:35,408 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:35,409 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 14] total 44 [2019-10-15 01:33:35,409 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133529184] [2019-10-15 01:33:35,410 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-15 01:33:35,411 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:35,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-15 01:33:35,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=1386, Unknown=0, NotChecked=0, Total=1892 [2019-10-15 01:33:35,413 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 44 states. [2019-10-15 01:33:37,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:37,123 INFO L93 Difference]: Finished difference Result 74 states and 94 transitions. [2019-10-15 01:33:37,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-10-15 01:33:37,123 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 38 [2019-10-15 01:33:37,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:37,124 INFO L225 Difference]: With dead ends: 74 [2019-10-15 01:33:37,125 INFO L226 Difference]: Without dead ends: 54 [2019-10-15 01:33:37,129 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1798 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1463, Invalid=5179, Unknown=0, NotChecked=0, Total=6642 [2019-10-15 01:33:37,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-15 01:33:37,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-10-15 01:33:37,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-15 01:33:37,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2019-10-15 01:33:37,146 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 38 [2019-10-15 01:33:37,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:37,148 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2019-10-15 01:33:37,148 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-15 01:33:37,148 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2019-10-15 01:33:37,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-15 01:33:37,151 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:37,151 INFO L380 BasicCegarLoop]: trace histogram [28, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:37,357 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:37,357 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:37,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:37,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1469456762, now seen corresponding path program 4 times [2019-10-15 01:33:37,358 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:37,358 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891619888] [2019-10-15 01:33:37,359 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:37,359 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:37,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:37,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:37,944 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:33:37,944 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891619888] [2019-10-15 01:33:37,944 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870269617] [2019-10-15 01:33:37,944 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 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 [2019-10-15 01:33:38,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:38,059 INFO L256 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-15 01:33:38,062 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:38,098 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:33:38,099 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:39,586 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:33:39,586 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [239238260] [2019-10-15 01:33:39,588 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:33:39,588 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:39,588 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:39,588 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:39,589 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:39,607 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:39,710 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:33:39,723 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:39,726 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:40,310 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:40,310 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 14] total 74 [2019-10-15 01:33:40,310 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557877179] [2019-10-15 01:33:40,312 INFO L442 AbstractCegarLoop]: Interpolant automaton has 74 states [2019-10-15 01:33:40,312 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:40,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2019-10-15 01:33:40,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1871, Invalid=3531, Unknown=0, NotChecked=0, Total=5402 [2019-10-15 01:33:40,314 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 74 states. [2019-10-15 01:33:44,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:44,068 INFO L93 Difference]: Finished difference Result 104 states and 139 transitions. [2019-10-15 01:33:44,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-10-15 01:33:44,068 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 53 [2019-10-15 01:33:44,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:44,069 INFO L225 Difference]: With dead ends: 104 [2019-10-15 01:33:44,069 INFO L226 Difference]: Without dead ends: 84 [2019-10-15 01:33:44,075 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4708 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=5498, Invalid=14524, Unknown=0, NotChecked=0, Total=20022 [2019-10-15 01:33:44,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-15 01:33:44,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-10-15 01:33:44,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-10-15 01:33:44,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2019-10-15 01:33:44,086 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 53 [2019-10-15 01:33:44,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:44,086 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2019-10-15 01:33:44,087 INFO L463 AbstractCegarLoop]: Interpolant automaton has 74 states. [2019-10-15 01:33:44,087 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2019-10-15 01:33:44,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-15 01:33:44,088 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:44,088 INFO L380 BasicCegarLoop]: trace histogram [58, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:44,292 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:44,292 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:44,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:44,293 INFO L82 PathProgramCache]: Analyzing trace with hash -912001158, now seen corresponding path program 5 times [2019-10-15 01:33:44,293 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:44,294 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531881895] [2019-10-15 01:33:44,294 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:44,294 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:44,295 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:44,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:46,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 2 proven. 1711 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:33:46,444 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531881895] [2019-10-15 01:33:46,444 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729310212] [2019-10-15 01:33:46,445 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 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 [2019-10-15 01:33:46,569 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:33:46,570 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:33:46,571 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-15 01:33:46,575 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:46,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2019-10-15 01:33:46,948 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:47,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2019-10-15 01:33:47,358 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [888163405] [2019-10-15 01:33:47,359 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:33:47,359 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:47,359 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:47,360 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:47,360 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:47,378 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:47,506 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:33:47,521 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:47,524 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:48,464 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:48,464 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 11, 11, 14] total 91 [2019-10-15 01:33:48,464 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042300239] [2019-10-15 01:33:48,466 INFO L442 AbstractCegarLoop]: Interpolant automaton has 91 states [2019-10-15 01:33:48,466 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:48,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2019-10-15 01:33:48,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1928, Invalid=6262, Unknown=0, NotChecked=0, Total=8190 [2019-10-15 01:33:48,469 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand 91 states. [2019-10-15 01:33:55,028 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 42 [2019-10-15 01:33:55,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:55,377 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2019-10-15 01:33:55,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2019-10-15 01:33:55,377 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 83 [2019-10-15 01:33:55,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:55,379 INFO L225 Difference]: With dead ends: 111 [2019-10-15 01:33:55,379 INFO L226 Difference]: Without dead ends: 91 [2019-10-15 01:33:55,383 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 221 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5645 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=5998, Invalid=22732, Unknown=0, NotChecked=0, Total=28730 [2019-10-15 01:33:55,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-15 01:33:55,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2019-10-15 01:33:55,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-15 01:33:55,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2019-10-15 01:33:55,395 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 83 [2019-10-15 01:33:55,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:55,395 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2019-10-15 01:33:55,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 91 states. [2019-10-15 01:33:55,395 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2019-10-15 01:33:55,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-10-15 01:33:55,397 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:55,397 INFO L380 BasicCegarLoop]: trace histogram [59, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:55,600 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:55,601 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:55,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:55,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1366373714, now seen corresponding path program 6 times [2019-10-15 01:33:55,602 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:55,603 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928328984] [2019-10-15 01:33:55,603 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:55,603 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:55,603 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:55,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:57,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1791 backedges. 4 proven. 1770 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-15 01:33:57,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928328984] [2019-10-15 01:33:57,739 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379008659] [2019-10-15 01:33:57,739 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 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 [2019-10-15 01:33:57,921 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:33:57,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:33:57,923 INFO L256 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:33:57,926 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:58,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1791 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 1774 trivial. 0 not checked. [2019-10-15 01:33:58,136 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:58,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1791 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 1774 trivial. 0 not checked. [2019-10-15 01:33:58,344 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274395996] [2019-10-15 01:33:58,346 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:33:58,346 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:58,346 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:58,347 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:58,347 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:58,388 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:58,504 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:33:58,523 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:58,526 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:59,521 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:59,522 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 8, 8, 14] total 84 [2019-10-15 01:33:59,522 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577767450] [2019-10-15 01:33:59,523 INFO L442 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-10-15 01:33:59,523 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:59,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-10-15 01:33:59,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1968, Invalid=5004, Unknown=0, NotChecked=0, Total=6972 [2019-10-15 01:33:59,527 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand 84 states.