/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --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/reducercommutativity/max40-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:39:06,910 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:39:06,913 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:39:06,932 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 04:39:06,941 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:39:06,942 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:39:06,943 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:39:06,945 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:39:06,945 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:39:06,947 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:39:06,948 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:39:06,950 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:39:06,954 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:39:06,958 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:39:06,959 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:39:06,960 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:39:06,963 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 04:39:06,970 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:39:06,971 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:39:06,972 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:39:06,973 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 04:39:06,987 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:39:06,987 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:39:06,988 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:39:06,989 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:39:06,989 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:39:06,989 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:39:06,989 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:39:06,990 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:39:06,990 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:39:06,990 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:39:06,990 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:39:06,990 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:39:06,990 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:39:06,991 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:39:06,991 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:39:06,991 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:39:06,991 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:39:06,991 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:39:06,992 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:39:06,992 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:39:06,992 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:39:06,992 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:39:06,992 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:39:06,993 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:39:06,993 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:39:06,993 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:39:06,993 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:39:06,993 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:39:06,994 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 [2019-11-07 04:39:07,271 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:39:07,285 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:39:07,288 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:39:07,290 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:39:07,290 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:39:07,291 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/reducercommutativity/max40-1.i [2019-11-07 04:39:07,366 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8029826eb/c5241c1659e04866999fc4056200cc4d/FLAGf94121331 [2019-11-07 04:39:07,806 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:39:07,806 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/reducercommutativity/max40-1.i [2019-11-07 04:39:07,813 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8029826eb/c5241c1659e04866999fc4056200cc4d/FLAGf94121331 [2019-11-07 04:39:08,176 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8029826eb/c5241c1659e04866999fc4056200cc4d [2019-11-07 04:39:08,185 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:39:08,187 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:39:08,188 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:39:08,188 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:39:08,192 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:39:08,193 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,196 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@262c9455 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08, skipping insertion in model container [2019-11-07 04:39:08,197 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,205 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:39:08,223 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:39:08,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:39:08,418 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:39:08,441 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:39:08,458 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:39:08,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08 WrapperNode [2019-11-07 04:39:08,459 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:39:08,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:39:08,460 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:39:08,460 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:39:08,560 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,560 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,572 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,573 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,582 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,594 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,596 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... [2019-11-07 04:39:08,600 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:39:08,600 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:39:08,600 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:39:08,601 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:39:08,601 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:39:08,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:39:08,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:39:08,667 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2019-11-07 04:39:08,668 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:39:08,668 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:39:08,668 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:39:08,668 INFO L130 BoogieDeclarations]: Found specification of procedure max [2019-11-07 04:39:08,668 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 04:39:08,669 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:39:08,669 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 04:39:08,669 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 04:39:08,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 04:39:08,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:39:08,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:39:09,120 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:39:09,121 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 04:39:09,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:39:09 BoogieIcfgContainer [2019-11-07 04:39:09,122 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:39:09,123 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:39:09,123 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:39:09,127 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:39:09,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:39:08" (1/3) ... [2019-11-07 04:39:09,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7754425d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:39:09, skipping insertion in model container [2019-11-07 04:39:09,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:08" (2/3) ... [2019-11-07 04:39:09,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7754425d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:39:09, skipping insertion in model container [2019-11-07 04:39:09,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:39:09" (3/3) ... [2019-11-07 04:39:09,132 INFO L109 eAbstractionObserver]: Analyzing ICFG max40-1.i [2019-11-07 04:39:09,143 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:39:09,152 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:39:09,165 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:39:09,192 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:39:09,193 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:39:09,193 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:39:09,193 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:39:09,193 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:39:09,193 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:39:09,194 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:39:09,194 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:39:09,214 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-11-07 04:39:09,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 04:39:09,221 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:09,223 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:09,225 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:09,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:09,231 INFO L82 PathProgramCache]: Analyzing trace with hash 855740909, now seen corresponding path program 1 times [2019-11-07 04:39:09,242 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:09,242 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511417281] [2019-11-07 04:39:09,243 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:09,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:09,471 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 04:39:09,472 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511417281] [2019-11-07 04:39:09,473 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:39:09,473 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:39:09,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505069683] [2019-11-07 04:39:09,483 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:39:09,484 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:09,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:39:09,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:39:09,502 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-11-07 04:39:09,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:09,536 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2019-11-07 04:39:09,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:39:09,538 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2019-11-07 04:39:09,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:09,550 INFO L225 Difference]: With dead ends: 41 [2019-11-07 04:39:09,550 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 04:39:09,562 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:39:09,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 04:39:09,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 04:39:09,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 04:39:09,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-11-07 04:39:09,610 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 24 [2019-11-07 04:39:09,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:09,610 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-11-07 04:39:09,611 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:39:09,611 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-11-07 04:39:09,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 04:39:09,613 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:09,613 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:09,614 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:09,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:09,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1075349738, now seen corresponding path program 1 times [2019-11-07 04:39:09,615 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:09,615 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477872509] [2019-11-07 04:39:09,615 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:09,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:09,689 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 04:39:09,690 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477872509] [2019-11-07 04:39:09,690 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728656944] [2019-11-07 04:39:09,692 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:09,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:09,813 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-07 04:39:09,828 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:09,871 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 04:39:09,871 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:10,000 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 04:39:10,001 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-07 04:39:10,001 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 5 [2019-11-07 04:39:10,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385759473] [2019-11-07 04:39:10,003 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:39:10,004 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:10,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:39:10,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 04:39:10,004 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-11-07 04:39:10,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:10,029 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2019-11-07 04:39:10,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:39:10,030 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2019-11-07 04:39:10,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:10,031 INFO L225 Difference]: With dead ends: 33 [2019-11-07 04:39:10,031 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 04:39:10,032 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 04:39:10,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 04:39:10,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 04:39:10,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 04:39:10,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 04:39:10,045 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2019-11-07 04:39:10,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:10,045 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 04:39:10,045 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:39:10,046 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 04:39:10,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 04:39:10,047 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:10,047 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:10,249 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:10,249 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:10,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:10,250 INFO L82 PathProgramCache]: Analyzing trace with hash 447698074, now seen corresponding path program 1 times [2019-11-07 04:39:10,250 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:10,250 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232874051] [2019-11-07 04:39:10,251 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:10,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:10,403 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:10,404 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232874051] [2019-11-07 04:39:10,404 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:39:10,404 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:39:10,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373791549] [2019-11-07 04:39:10,405 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:39:10,405 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:10,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:39:10,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:39:10,406 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2019-11-07 04:39:10,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:10,418 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-07 04:39:10,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:39:10,419 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-11-07 04:39:10,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:10,420 INFO L225 Difference]: With dead ends: 31 [2019-11-07 04:39:10,420 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 04:39:10,421 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:39:10,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 04:39:10,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 04:39:10,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 04:39:10,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-07 04:39:10,427 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 28 [2019-11-07 04:39:10,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:10,429 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-07 04:39:10,429 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:39:10,429 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-07 04:39:10,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 04:39:10,430 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:10,431 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:10,431 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:10,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:10,432 INFO L82 PathProgramCache]: Analyzing trace with hash -69054062, now seen corresponding path program 1 times [2019-11-07 04:39:10,432 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:10,432 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962993180] [2019-11-07 04:39:10,432 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:10,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:10,529 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:10,530 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962993180] [2019-11-07 04:39:10,530 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837790813] [2019-11-07 04:39:10,530 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:10,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:10,623 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:39:10,626 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:10,640 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:10,640 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:10,692 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:10,693 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765346279] [2019-11-07 04:39:10,720 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:10,720 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:10,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:10,734 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:10,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:10,876 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:11,375 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-11-07 04:39:11,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:11,404 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:39:12,093 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:39:12,094 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 15] total 21 [2019-11-07 04:39:12,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107110935] [2019-11-07 04:39:12,096 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 04:39:12,096 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:12,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 04:39:12,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2019-11-07 04:39:12,097 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 21 states. [2019-11-07 04:39:15,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:15,137 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2019-11-07 04:39:15,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 04:39:15,141 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 29 [2019-11-07 04:39:15,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:15,142 INFO L225 Difference]: With dead ends: 40 [2019-11-07 04:39:15,142 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 04:39:15,144 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=170, Invalid=1089, Unknown=1, NotChecked=0, Total=1260 [2019-11-07 04:39:15,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 04:39:15,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 04:39:15,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 04:39:15,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-11-07 04:39:15,151 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 29 [2019-11-07 04:39:15,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:15,151 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-11-07 04:39:15,151 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 04:39:15,151 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-11-07 04:39:15,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 04:39:15,152 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:15,152 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:15,355 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:15,356 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:15,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:15,357 INFO L82 PathProgramCache]: Analyzing trace with hash -493974743, now seen corresponding path program 2 times [2019-11-07 04:39:15,357 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:15,358 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33992601] [2019-11-07 04:39:15,358 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:15,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:15,577 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:15,577 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33992601] [2019-11-07 04:39:15,577 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140382139] [2019-11-07 04:39:15,578 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:15,637 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 04:39:15,637 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:39:15,638 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:39:15,643 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:15,660 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 04:39:15,660 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:15,700 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 04:39:15,700 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105637737] [2019-11-07 04:39:15,702 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:15,702 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:15,703 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:15,703 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:15,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:15,750 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:16,098 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-11-07 04:39:16,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:16,134 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:39:16,766 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:39:16,767 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 15] total 25 [2019-11-07 04:39:16,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795391198] [2019-11-07 04:39:16,768 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 04:39:16,768 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:16,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 04:39:16,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2019-11-07 04:39:16,770 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 25 states. [2019-11-07 04:39:18,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:18,060 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2019-11-07 04:39:18,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 04:39:18,060 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2019-11-07 04:39:18,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:18,061 INFO L225 Difference]: With dead ends: 44 [2019-11-07 04:39:18,062 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 04:39:18,063 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=247, Invalid=1733, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 04:39:18,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 04:39:18,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-07 04:39:18,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 04:39:18,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-11-07 04:39:18,071 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 32 [2019-11-07 04:39:18,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:18,071 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-11-07 04:39:18,072 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 04:39:18,072 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-11-07 04:39:18,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-07 04:39:18,073 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:18,073 INFO L410 BasicCegarLoop]: trace histogram [12, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:18,278 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:18,278 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:18,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:18,279 INFO L82 PathProgramCache]: Analyzing trace with hash 132820922, now seen corresponding path program 3 times [2019-11-07 04:39:18,279 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:18,279 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404535749] [2019-11-07 04:39:18,279 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:18,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:18,437 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2019-11-07 04:39:18,438 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404535749] [2019-11-07 04:39:18,438 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875870972] [2019-11-07 04:39:18,438 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:18,578 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:39:18,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:39:18,581 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 04:39:18,600 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:18,675 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:39:18,675 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:18,794 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:39:18,794 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2127649110] [2019-11-07 04:39:18,799 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:18,799 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:18,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:18,801 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:18,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:18,825 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:19,139 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-11-07 04:39:19,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:19,163 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:39:23,923 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:39:23,923 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 15] total 33 [2019-11-07 04:39:23,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361733476] [2019-11-07 04:39:23,924 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-07 04:39:23,925 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:23,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-07 04:39:23,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=902, Unknown=2, NotChecked=0, Total=1056 [2019-11-07 04:39:23,926 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 33 states. [2019-11-07 04:39:35,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:35,605 INFO L93 Difference]: Finished difference Result 55 states and 73 transitions. [2019-11-07 04:39:35,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-07 04:39:35,606 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 42 [2019-11-07 04:39:35,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:35,607 INFO L225 Difference]: With dead ends: 55 [2019-11-07 04:39:35,607 INFO L226 Difference]: Without dead ends: 37 [2019-11-07 04:39:35,610 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=482, Invalid=3174, Unknown=4, NotChecked=0, Total=3660 [2019-11-07 04:39:35,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-07 04:39:35,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-11-07 04:39:35,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 04:39:35,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2019-11-07 04:39:35,643 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 42 [2019-11-07 04:39:35,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:35,644 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2019-11-07 04:39:35,644 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-07 04:39:35,644 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2019-11-07 04:39:35,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-07 04:39:35,649 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:35,653 INFO L410 BasicCegarLoop]: trace histogram [15, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:35,853 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:35,854 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:35,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:35,855 INFO L82 PathProgramCache]: Analyzing trace with hash -431924951, now seen corresponding path program 4 times [2019-11-07 04:39:35,855 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:35,855 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438291043] [2019-11-07 04:39:35,856 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:35,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:35,954 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 37 proven. 52 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2019-11-07 04:39:35,955 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438291043] [2019-11-07 04:39:35,955 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964904746] [2019-11-07 04:39:35,955 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:36,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:36,041 INFO L256 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-07 04:39:36,044 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:36,185 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-07 04:39:36,185 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:36,477 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-07 04:39:36,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1970608384] [2019-11-07 04:39:36,479 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:36,479 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:36,479 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:36,480 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:36,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:36,503 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:36,773 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-11-07 04:39:36,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:36,784 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:39:37,816 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:39:37,817 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15, 15] total 48 [2019-11-07 04:39:37,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544677316] [2019-11-07 04:39:37,818 INFO L442 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-11-07 04:39:37,818 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:37,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-11-07 04:39:37,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=1810, Unknown=0, NotChecked=0, Total=2256 [2019-11-07 04:39:37,820 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 48 states. [2019-11-07 04:39:40,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:40,193 INFO L93 Difference]: Finished difference Result 71 states and 96 transitions. [2019-11-07 04:39:40,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-11-07 04:39:40,193 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 52 [2019-11-07 04:39:40,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:40,195 INFO L225 Difference]: With dead ends: 71 [2019-11-07 04:39:40,195 INFO L226 Difference]: Without dead ends: 52 [2019-11-07 04:39:40,198 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2170 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1370, Invalid=6820, Unknown=0, NotChecked=0, Total=8190 [2019-11-07 04:39:40,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-07 04:39:40,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-11-07 04:39:40,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-07 04:39:40,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2019-11-07 04:39:40,207 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 52 [2019-11-07 04:39:40,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:40,207 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2019-11-07 04:39:40,207 INFO L463 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-11-07 04:39:40,207 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2019-11-07 04:39:40,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-07 04:39:40,208 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:40,209 INFO L410 BasicCegarLoop]: trace histogram [26, 18, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:40,412 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:40,412 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:40,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:40,413 INFO L82 PathProgramCache]: Analyzing trace with hash -1392966237, now seen corresponding path program 5 times [2019-11-07 04:39:40,413 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:40,413 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294458301] [2019-11-07 04:39:40,413 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:40,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:40,889 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2019-11-07 04:39:40,890 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294458301] [2019-11-07 04:39:40,890 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625672186] [2019-11-07 04:39:40,890 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:40,986 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 04:39:40,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:39:40,990 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:39:41,000 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:41,030 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 102 proven. 1 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-11-07 04:39:41,030 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:41,079 INFO L134 CoverageAnalysis]: Checked inductivity of 568 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 567 trivial. 0 not checked. [2019-11-07 04:39:41,079 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [394692012] [2019-11-07 04:39:41,081 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:41,081 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:41,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:41,081 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:41,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:41,116 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:41,435 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-11-07 04:39:41,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:41,458 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:39:42,818 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:39:42,818 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 4, 4, 15] total 47 [2019-11-07 04:39:42,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903097480] [2019-11-07 04:39:42,819 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-11-07 04:39:42,819 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:42,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-11-07 04:39:42,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1702, Unknown=0, NotChecked=0, Total=2162 [2019-11-07 04:39:42,821 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 47 states. [2019-11-07 04:39:47,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:47,455 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2019-11-07 04:39:47,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-11-07 04:39:47,455 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 69 [2019-11-07 04:39:47,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:47,457 INFO L225 Difference]: With dead ends: 76 [2019-11-07 04:39:47,457 INFO L226 Difference]: Without dead ends: 56 [2019-11-07 04:39:47,460 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1695 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1386, Invalid=6446, Unknown=0, NotChecked=0, Total=7832 [2019-11-07 04:39:47,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-07 04:39:47,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-11-07 04:39:47,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-07 04:39:47,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2019-11-07 04:39:47,469 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 69 [2019-11-07 04:39:47,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:47,470 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2019-11-07 04:39:47,470 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-11-07 04:39:47,470 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2019-11-07 04:39:47,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-07 04:39:47,471 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:47,471 INFO L410 BasicCegarLoop]: trace histogram [27, 18, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:47,678 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:47,678 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:47,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:47,678 INFO L82 PathProgramCache]: Analyzing trace with hash -127838474, now seen corresponding path program 6 times [2019-11-07 04:39:47,679 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:47,679 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156511324] [2019-11-07 04:39:47,679 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:47,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:48,098 INFO L134 CoverageAnalysis]: Checked inductivity of 604 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2019-11-07 04:39:48,098 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156511324] [2019-11-07 04:39:48,098 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845919517] [2019-11-07 04:39:48,098 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 [2019-11-07 04:39:48,226 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:39:48,226 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:39:48,228 INFO L256 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-07 04:39:48,235 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:48,256 INFO L134 CoverageAnalysis]: Checked inductivity of 604 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2019-11-07 04:39:48,257 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:49,007 INFO L134 CoverageAnalysis]: Checked inductivity of 604 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2019-11-07 04:39:49,007 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131859301] [2019-11-07 04:39:49,009 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:49,009 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:49,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:49,009 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:49,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:49,029 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:49,237 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-11-07 04:39:49,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:49,265 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:39:52,353 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:39:52,353 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 15] total 57 [2019-11-07 04:39:52,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474340487] [2019-11-07 04:39:52,355 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-11-07 04:39:52,355 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:52,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-11-07 04:39:52,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=943, Invalid=2248, Unknown=1, NotChecked=0, Total=3192 [2019-11-07 04:39:52,357 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 57 states.