/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/loop-lit/mcmillan2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:02:11,032 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:02:11,035 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:02:11,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:02:11,054 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:02:11,057 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:02:11,058 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:02:11,068 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:02:11,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:02:11,073 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:02:11,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:02:11,075 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:02:11,075 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:02:11,076 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:02:11,077 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:02:11,078 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:02:11,079 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:02:11,080 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:02:11,085 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:02:11,087 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:02:11,091 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:02:11,092 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:02:11,094 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:02:11,094 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:02:11,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 04:02:11,100 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 04:02:11,100 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 04:02:11,101 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 04:02:11,101 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 04:02:11,102 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 04:02:11,103 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 04:02:11,103 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 04:02:11,104 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 04:02:11,105 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 04:02:11,106 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 04:02:11,106 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 04:02:11,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 04:02:11,107 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 04:02:11,107 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:02:11,108 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:02:11,109 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:02:11,110 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 04:02:11,123 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:02:11,124 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:02:11,125 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:02:11,125 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:02:11,125 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:02:11,126 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:02:11,126 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:02:11,126 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:02:11,126 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:02:11,126 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:02:11,126 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:02:11,127 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:02:11,127 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:02:11,127 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:02:11,127 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:02:11,127 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:02:11,128 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:02:11,128 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:02:11,128 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:02:11,128 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:02:11,128 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:02:11,129 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:02:11,129 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:02:11,129 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:02:11,129 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:02:11,129 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:02:11,130 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:02:11,130 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:02:11,130 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 04:02:11,403 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:02:11,424 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:02:11,428 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:02:11,429 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:02:11,429 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:02:11,430 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/mcmillan2006.i [2019-11-07 04:02:11,504 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c49341c1/f0ce05ba1f4748a3957eb5d065f2a7fe/FLAG366d5546a [2019-11-07 04:02:11,941 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:02:11,942 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/mcmillan2006.i [2019-11-07 04:02:11,949 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c49341c1/f0ce05ba1f4748a3957eb5d065f2a7fe/FLAG366d5546a [2019-11-07 04:02:12,334 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c49341c1/f0ce05ba1f4748a3957eb5d065f2a7fe [2019-11-07 04:02:12,358 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:02:12,367 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:02:12,375 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:02:12,376 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:02:12,383 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:02:12,384 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,394 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2645ad9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12, skipping insertion in model container [2019-11-07 04:02:12,394 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,415 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:02:12,458 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:02:12,650 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:02:12,665 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:02:12,686 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:02:12,705 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:02:12,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12 WrapperNode [2019-11-07 04:02:12,705 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:02:12,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:02:12,706 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:02:12,706 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:02:12,792 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,792 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,802 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,804 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,820 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,827 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,829 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (1/1) ... [2019-11-07 04:02:12,833 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:02:12,833 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:02:12,833 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:02:12,834 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:02:12,835 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (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 04:02:12,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:02:12,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:02:12,888 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:02:12,888 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:02:12,888 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 04:02:12,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:02:12,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 04:02:12,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:02:12,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:02:12,889 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:02:12,889 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 04:02:12,889 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 04:02:12,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 04:02:12,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:02:12,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:02:12,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 04:02:13,218 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:02:13,219 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-07 04:02:13,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:02:13 BoogieIcfgContainer [2019-11-07 04:02:13,220 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:02:13,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:02:13,222 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:02:13,224 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:02:13,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:02:12" (1/3) ... [2019-11-07 04:02:13,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e980b25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:02:13, skipping insertion in model container [2019-11-07 04:02:13,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:12" (2/3) ... [2019-11-07 04:02:13,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e980b25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:02:13, skipping insertion in model container [2019-11-07 04:02:13,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:02:13" (3/3) ... [2019-11-07 04:02:13,228 INFO L109 eAbstractionObserver]: Analyzing ICFG mcmillan2006.i [2019-11-07 04:02:13,235 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:02:13,242 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:02:13,252 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:02:13,273 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:02:13,273 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:02:13,273 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:02:13,274 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:02:13,274 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:02:13,274 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:02:13,274 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:02:13,274 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:02:13,290 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-11-07 04:02:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 04:02:13,297 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:13,298 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:13,299 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:13,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:13,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1720712542, now seen corresponding path program 1 times [2019-11-07 04:02:13,315 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:13,315 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144106334] [2019-11-07 04:02:13,315 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:13,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:13,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:13,522 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144106334] [2019-11-07 04:02:13,523 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:02:13,524 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 04:02:13,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298597343] [2019-11-07 04:02:13,528 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 04:02:13,529 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:13,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 04:02:13,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 04:02:13,542 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 4 states. [2019-11-07 04:02:13,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:13,615 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2019-11-07 04:02:13,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 04:02:13,617 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-07 04:02:13,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:13,628 INFO L225 Difference]: With dead ends: 37 [2019-11-07 04:02:13,629 INFO L226 Difference]: Without dead ends: 17 [2019-11-07 04:02:13,635 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-07 04:02:13,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-07 04:02:13,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-07 04:02:13,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-07 04:02:13,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-11-07 04:02:13,674 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-11-07 04:02:13,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:13,674 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-11-07 04:02:13,675 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 04:02:13,675 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-11-07 04:02:13,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 04:02:13,676 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:13,676 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:13,676 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:13,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:13,677 INFO L82 PathProgramCache]: Analyzing trace with hash -825415550, now seen corresponding path program 1 times [2019-11-07 04:02:13,677 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:13,678 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1501318935] [2019-11-07 04:02:13,678 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:13,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:13,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:13,926 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1501318935] [2019-11-07 04:02:13,926 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795952561] [2019-11-07 04:02:13,926 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 04:02:13,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:13,984 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-07 04:02:13,990 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:14,071 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-11-07 04:02:14,072 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:02:14,078 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:02:14,079 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:02:14,079 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2019-11-07 04:02:14,127 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-07 04:02:14,129 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:02:14,133 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:02:14,133 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:02:14,133 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2019-11-07 04:02:14,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:14,168 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:14,202 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2019-11-07 04:02:14,209 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2019-11-07 04:02:14,210 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-07 04:02:14,213 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:02:14,214 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:02:14,217 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:02:14,218 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-07 04:02:14,218 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:14, output treesize:7 [2019-11-07 04:02:14,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:14,241 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734522933] [2019-11-07 04:02:14,268 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 04:02:14,269 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:14,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:14,283 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:14,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:14,436 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:14,695 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 04:02:14,709 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:14,711 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:15,352 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:15,353 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 25 [2019-11-07 04:02:15,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432482332] [2019-11-07 04:02:15,356 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 04:02:15,356 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:15,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 04:02:15,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=535, Unknown=0, NotChecked=0, Total=600 [2019-11-07 04:02:15,360 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 25 states. [2019-11-07 04:02:16,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:16,160 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2019-11-07 04:02:16,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-07 04:02:16,160 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 13 [2019-11-07 04:02:16,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:16,162 INFO L225 Difference]: With dead ends: 26 [2019-11-07 04:02:16,162 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 04:02:16,164 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=150, Invalid=972, Unknown=0, NotChecked=0, Total=1122 [2019-11-07 04:02:16,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 04:02:16,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-07 04:02:16,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-07 04:02:16,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-11-07 04:02:16,172 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 13 [2019-11-07 04:02:16,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:16,172 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-11-07 04:02:16,172 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 04:02:16,172 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-11-07 04:02:16,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 04:02:16,173 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:16,173 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:16,378 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:16,378 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:16,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:16,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1785378702, now seen corresponding path program 1 times [2019-11-07 04:02:16,379 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:16,379 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970266820] [2019-11-07 04:02:16,380 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:16,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:16,521 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:16,521 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970266820] [2019-11-07 04:02:16,522 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772026555] [2019-11-07 04:02:16,522 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 04:02:16,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:16,559 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 04:02:16,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:16,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:16,606 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:16,638 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:16,638 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1862188703] [2019-11-07 04:02:16,640 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:16,640 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:16,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:16,641 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:16,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:16,672 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:17,150 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:17,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:17,158 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:17,873 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:17,873 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 13] total 23 [2019-11-07 04:02:17,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750992000] [2019-11-07 04:02:17,875 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-07 04:02:17,876 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:17,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-07 04:02:17,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2019-11-07 04:02:17,877 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 23 states. [2019-11-07 04:02:18,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:18,832 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2019-11-07 04:02:18,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-07 04:02:18,833 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 20 [2019-11-07 04:02:18,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:18,836 INFO L225 Difference]: With dead ends: 37 [2019-11-07 04:02:18,837 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 04:02:18,844 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=203, Invalid=1129, Unknown=0, NotChecked=0, Total=1332 [2019-11-07 04:02:18,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 04:02:18,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 04:02:18,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 04:02:18,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-11-07 04:02:18,869 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2019-11-07 04:02:18,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:18,869 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-11-07 04:02:18,871 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-07 04:02:18,871 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-11-07 04:02:18,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 04:02:18,872 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:18,874 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:19,077 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:19,079 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:19,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:19,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1645445454, now seen corresponding path program 2 times [2019-11-07 04:02:19,080 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:19,080 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509446866] [2019-11-07 04:02:19,080 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:19,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:19,204 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:19,205 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509446866] [2019-11-07 04:02:19,205 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157448557] [2019-11-07 04:02:19,205 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 04:02:19,261 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 04:02:19,261 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:02:19,262 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-07 04:02:19,266 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:21,488 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:21,488 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:22,136 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:22,137 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1441351984] [2019-11-07 04:02:22,138 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:22,138 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:22,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:22,139 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:22,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:22,166 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:22,513 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:22,521 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:22,523 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:23,282 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:23,283 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 13] total 30 [2019-11-07 04:02:23,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163258278] [2019-11-07 04:02:23,284 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-07 04:02:23,285 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:23,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-07 04:02:23,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=778, Unknown=2, NotChecked=0, Total=870 [2019-11-07 04:02:23,286 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 30 states. [2019-11-07 04:02:24,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:24,795 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2019-11-07 04:02:24,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-07 04:02:24,795 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 21 [2019-11-07 04:02:24,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:24,797 INFO L225 Difference]: With dead ends: 32 [2019-11-07 04:02:24,797 INFO L226 Difference]: Without dead ends: 30 [2019-11-07 04:02:24,799 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 40 SyntacticMatches, 5 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=266, Invalid=1802, Unknown=2, NotChecked=0, Total=2070 [2019-11-07 04:02:24,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-07 04:02:24,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-11-07 04:02:24,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 04:02:24,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-07 04:02:24,807 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2019-11-07 04:02:24,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:24,808 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-07 04:02:24,808 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-07 04:02:24,808 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-07 04:02:24,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 04:02:24,810 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:24,810 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:25,013 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:25,014 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:25,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:25,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1236732766, now seen corresponding path program 3 times [2019-11-07 04:02:25,015 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:25,016 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728593922] [2019-11-07 04:02:25,016 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:25,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:25,073 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:02:25,073 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728593922] [2019-11-07 04:02:25,073 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176231064] [2019-11-07 04:02:25,073 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 04:02:25,134 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:02:25,134 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:02:25,135 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 04:02:25,138 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:25,187 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:02:25,188 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:25,219 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:02:25,219 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700663431] [2019-11-07 04:02:25,221 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:25,221 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:25,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:25,222 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:25,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:25,237 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:25,450 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:25,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:25,457 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:26,090 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:26,090 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 13] total 26 [2019-11-07 04:02:26,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195818559] [2019-11-07 04:02:26,095 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 04:02:26,095 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:26,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 04:02:26,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=565, Unknown=0, NotChecked=0, Total=650 [2019-11-07 04:02:26,096 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 26 states. [2019-11-07 04:02:27,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:27,479 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2019-11-07 04:02:27,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 04:02:27,479 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2019-11-07 04:02:27,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:27,481 INFO L225 Difference]: With dead ends: 46 [2019-11-07 04:02:27,481 INFO L226 Difference]: Without dead ends: 30 [2019-11-07 04:02:27,483 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 64 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=263, Invalid=1543, Unknown=0, NotChecked=0, Total=1806 [2019-11-07 04:02:27,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-07 04:02:27,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-11-07 04:02:27,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-07 04:02:27,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-11-07 04:02:27,493 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2019-11-07 04:02:27,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:27,494 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-11-07 04:02:27,494 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-07 04:02:27,494 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-11-07 04:02:27,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 04:02:27,495 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:27,495 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:27,700 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:27,700 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:27,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:27,701 INFO L82 PathProgramCache]: Analyzing trace with hash 2015456898, now seen corresponding path program 4 times [2019-11-07 04:02:27,701 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:27,701 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721316782] [2019-11-07 04:02:27,702 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:27,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:27,938 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:02:27,939 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721316782] [2019-11-07 04:02:27,939 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840132460] [2019-11-07 04:02:27,939 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 04:02:28,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:28,001 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-07 04:02:28,003 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:33,236 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:02:33,237 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:33,820 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:02:33,820 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [806646504] [2019-11-07 04:02:33,821 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:33,821 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:33,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:33,822 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:33,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:33,852 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:34,046 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:34,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:34,054 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:34,802 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:34,803 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12, 13] total 31 [2019-11-07 04:02:34,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621058795] [2019-11-07 04:02:34,805 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-07 04:02:34,805 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:34,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-07 04:02:34,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=835, Unknown=3, NotChecked=0, Total=930 [2019-11-07 04:02:34,806 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 31 states. [2019-11-07 04:02:36,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:36,640 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2019-11-07 04:02:36,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 04:02:36,641 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 29 [2019-11-07 04:02:36,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:36,642 INFO L225 Difference]: With dead ends: 38 [2019-11-07 04:02:36,642 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 04:02:36,643 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 63 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 480 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=297, Invalid=2150, Unknown=3, NotChecked=0, Total=2450 [2019-11-07 04:02:36,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 04:02:36,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2019-11-07 04:02:36,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-07 04:02:36,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-11-07 04:02:36,652 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2019-11-07 04:02:36,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:36,653 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-11-07 04:02:36,653 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-07 04:02:36,653 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-11-07 04:02:36,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-07 04:02:36,654 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:36,654 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:36,858 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:36,859 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:36,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:36,859 INFO L82 PathProgramCache]: Analyzing trace with hash -321146482, now seen corresponding path program 5 times [2019-11-07 04:02:36,860 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:36,860 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570203405] [2019-11-07 04:02:36,860 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:36,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:36,946 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 04:02:36,947 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570203405] [2019-11-07 04:02:36,947 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431987696] [2019-11-07 04:02:36,947 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 04:02:37,007 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 04:02:37,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:02:37,008 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 04:02:37,011 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:37,074 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 04:02:37,074 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:37,122 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 04:02:37,122 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [946760400] [2019-11-07 04:02:37,124 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:37,124 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:37,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:37,125 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:37,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:37,155 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:37,410 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:37,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:37,427 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:38,089 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:38,090 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 13] total 29 [2019-11-07 04:02:38,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034010957] [2019-11-07 04:02:38,091 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 04:02:38,091 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:38,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 04:02:38,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2019-11-07 04:02:38,092 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 29 states. [2019-11-07 04:02:39,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:39,558 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2019-11-07 04:02:39,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 04:02:39,558 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2019-11-07 04:02:39,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:39,560 INFO L225 Difference]: With dead ends: 53 [2019-11-07 04:02:39,560 INFO L226 Difference]: Without dead ends: 34 [2019-11-07 04:02:39,562 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=336, Invalid=2016, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 04:02:39,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-07 04:02:39,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-07 04:02:39,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 04:02:39,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-11-07 04:02:39,570 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 36 [2019-11-07 04:02:39,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:39,571 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-11-07 04:02:39,571 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 04:02:39,571 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-11-07 04:02:39,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-07 04:02:39,572 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:39,572 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:39,775 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:39,775 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:39,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:39,776 INFO L82 PathProgramCache]: Analyzing trace with hash 1641197746, now seen corresponding path program 6 times [2019-11-07 04:02:39,776 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:39,776 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116824808] [2019-11-07 04:02:39,777 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:39,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:39,942 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 04:02:39,942 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116824808] [2019-11-07 04:02:39,942 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772877056] [2019-11-07 04:02:39,943 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 04:02:40,018 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:02:40,019 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:02:40,020 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-07 04:02:40,022 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:40,413 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 04:02:40,413 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:40,468 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 04:02:40,468 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738511294] [2019-11-07 04:02:40,469 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:40,469 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:40,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:40,470 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:40,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:40,485 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:40,649 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:40,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:40,657 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:41,173 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 26 [2019-11-07 04:02:41,543 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:41,544 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14, 13] total 40 [2019-11-07 04:02:41,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885155489] [2019-11-07 04:02:41,546 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-11-07 04:02:41,546 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:41,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-11-07 04:02:41,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1435, Unknown=0, NotChecked=0, Total=1560 [2019-11-07 04:02:41,547 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 40 states. [2019-11-07 04:02:43,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:43,675 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2019-11-07 04:02:43,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 04:02:43,676 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 37 [2019-11-07 04:02:43,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:43,677 INFO L225 Difference]: With dead ends: 42 [2019-11-07 04:02:43,677 INFO L226 Difference]: Without dead ends: 40 [2019-11-07 04:02:43,679 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 80 SyntacticMatches, 7 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 896 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=378, Invalid=3404, Unknown=0, NotChecked=0, Total=3782 [2019-11-07 04:02:43,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-07 04:02:43,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2019-11-07 04:02:43,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 04:02:43,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2019-11-07 04:02:43,688 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 37 [2019-11-07 04:02:43,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:43,688 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2019-11-07 04:02:43,688 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-11-07 04:02:43,688 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2019-11-07 04:02:43,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-07 04:02:43,690 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:43,690 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:43,893 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:43,893 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:43,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:43,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1909758302, now seen corresponding path program 7 times [2019-11-07 04:02:43,894 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:43,894 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849854492] [2019-11-07 04:02:43,894 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:43,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:44,035 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 24 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:02:44,035 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849854492] [2019-11-07 04:02:44,035 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804899378] [2019-11-07 04:02:44,036 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:44,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:44,127 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 04:02:44,138 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:44,236 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 34 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:02:44,237 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:44,325 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 34 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:02:44,325 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [838773997] [2019-11-07 04:02:44,331 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:44,331 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:44,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:44,333 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:44,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:44,356 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:44,649 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:44,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:44,656 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:45,278 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 26 [2019-11-07 04:02:45,670 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:45,670 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 13] total 32 [2019-11-07 04:02:45,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788893118] [2019-11-07 04:02:45,671 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-07 04:02:45,672 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:45,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-07 04:02:45,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2019-11-07 04:02:45,677 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 32 states. [2019-11-07 04:02:47,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:47,525 INFO L93 Difference]: Finished difference Result 60 states and 69 transitions. [2019-11-07 04:02:47,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 04:02:47,526 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 44 [2019-11-07 04:02:47,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:47,527 INFO L225 Difference]: With dead ends: 60 [2019-11-07 04:02:47,527 INFO L226 Difference]: Without dead ends: 38 [2019-11-07 04:02:47,529 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 106 SyntacticMatches, 8 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 846 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=422, Invalid=2548, Unknown=0, NotChecked=0, Total=2970 [2019-11-07 04:02:47,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-07 04:02:47,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-11-07 04:02:47,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-07 04:02:47,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2019-11-07 04:02:47,549 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 44 [2019-11-07 04:02:47,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:47,549 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2019-11-07 04:02:47,549 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-07 04:02:47,549 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2019-11-07 04:02:47,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 04:02:47,553 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:47,553 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:47,757 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:47,757 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:47,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:47,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1795410814, now seen corresponding path program 8 times [2019-11-07 04:02:47,758 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:47,758 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971587928] [2019-11-07 04:02:47,758 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:47,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:48,014 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:02:48,014 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971587928] [2019-11-07 04:02:48,014 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546434433] [2019-11-07 04:02:48,014 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:48,099 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-07 04:02:48,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:02:48,100 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-07 04:02:48,102 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:49,494 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:02:49,495 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:49,987 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 26 proven. 23 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:02:49,987 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624332556] [2019-11-07 04:02:49,988 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 04:02:49,989 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:49,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:49,989 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:49,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:50,008 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:02:50,171 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2019-11-07 04:02:50,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:02:50,179 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:51,198 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:51,199 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 16, 13] total 49 [2019-11-07 04:02:51,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272793236] [2019-11-07 04:02:51,200 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-11-07 04:02:51,200 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:51,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-11-07 04:02:51,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2153, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 04:02:51,201 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 49 states. [2019-11-07 04:02:53,950 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 57