/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-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:00:34,207 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:00:34,210 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:00:34,227 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:00:34,227 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:00:34,228 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:00:34,229 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:00:34,231 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:00:34,233 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:00:34,234 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:00:34,235 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:00:34,236 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:00:34,236 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:00:34,237 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:00:34,238 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:00:34,239 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:00:34,240 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:00:34,241 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:00:34,243 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:00:34,245 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:00:34,246 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:00:34,247 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:00:34,248 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:00:34,249 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:00:34,251 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 04:00:34,251 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 04:00:34,252 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 04:00:34,252 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 04:00:34,253 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 04:00:34,254 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 04:00:34,254 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 04:00:34,255 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 04:00:34,256 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 04:00:34,256 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 04:00:34,257 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 04:00:34,258 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 04:00:34,258 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 04:00:34,259 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 04:00:34,259 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:00:34,260 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:00:34,260 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:00:34,261 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 04:00:34,275 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:00:34,276 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:00:34,277 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:00:34,277 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:00:34,277 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:00:34,278 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:00:34,278 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:00:34,278 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:00:34,278 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:00:34,278 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:00:34,279 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:00:34,279 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:00:34,279 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:00:34,279 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:00:34,279 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:00:34,280 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:00:34,280 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:00:34,280 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:00:34,280 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:00:34,280 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:00:34,281 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:00:34,281 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:00:34,281 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:00:34,281 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:00:34,281 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:00:34,282 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:00:34,282 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:00:34,282 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:00:34,282 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 04:00:34,553 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:00:34,566 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:00:34,569 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:00:34,571 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:00:34,571 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:00:34,572 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-11-07 04:00:34,639 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47234d6f6/ccb8639c7b7042a4852ccfe80551d085/FLAG0f7ebb9c2 [2019-11-07 04:00:35,139 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:00:35,142 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-11-07 04:00:35,149 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47234d6f6/ccb8639c7b7042a4852ccfe80551d085/FLAG0f7ebb9c2 [2019-11-07 04:00:35,484 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47234d6f6/ccb8639c7b7042a4852ccfe80551d085 [2019-11-07 04:00:35,501 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:00:35,511 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:00:35,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:00:35,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:00:35,525 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:00:35,526 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:35,532 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d6e4bbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35, skipping insertion in model container [2019-11-07 04:00:35,534 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:35,553 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:00:35,600 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:00:35,908 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:00:35,912 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:00:35,930 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:00:35,943 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:00:35,944 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35 WrapperNode [2019-11-07 04:00:35,945 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:00:35,945 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:00:35,946 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:00:35,946 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:00:35,955 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:35,956 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:36,034 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:36,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:36,038 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:36,043 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:36,044 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (1/1) ... [2019-11-07 04:00:36,046 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:00:36,046 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:00:36,047 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:00:36,047 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:00:36,047 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (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 04:00:36,103 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:00:36,103 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:00:36,104 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:00:36,104 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:00:36,104 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:00:36,104 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:00:36,104 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:00:36,104 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:00:36,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:00:36,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:00:36,462 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:00:36,462 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-07 04:00:36,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:00:36 BoogieIcfgContainer [2019-11-07 04:00:36,464 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:00:36,466 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:00:36,466 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:00:36,469 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:00:36,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:00:35" (1/3) ... [2019-11-07 04:00:36,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49bbb8e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:00:36, skipping insertion in model container [2019-11-07 04:00:36,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:00:35" (2/3) ... [2019-11-07 04:00:36,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49bbb8e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:00:36, skipping insertion in model container [2019-11-07 04:00:36,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:00:36" (3/3) ... [2019-11-07 04:00:36,472 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-3.c [2019-11-07 04:00:36,479 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:00:36,486 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:00:36,496 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:00:36,518 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:00:36,518 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:00:36,518 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:00:36,518 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:00:36,519 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:00:36,519 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:00:36,519 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:00:36,519 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:00:36,534 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-07 04:00:36,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 04:00:36,539 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:36,539 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:36,541 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:36,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:36,546 INFO L82 PathProgramCache]: Analyzing trace with hash 254027471, now seen corresponding path program 1 times [2019-11-07 04:00:36,554 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:36,555 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820580324] [2019-11-07 04:00:36,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:36,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:36,711 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 04:00:36,712 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820580324] [2019-11-07 04:00:36,713 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:00:36,713 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:00:36,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005044836] [2019-11-07 04:00:36,721 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:00:36,721 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:00:36,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:00:36,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:00:36,740 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-11-07 04:00:36,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:36,786 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2019-11-07 04:00:36,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:00:36,788 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-07 04:00:36,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:36,798 INFO L225 Difference]: With dead ends: 28 [2019-11-07 04:00:36,799 INFO L226 Difference]: Without dead ends: 16 [2019-11-07 04:00:36,803 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 04:00:36,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-07 04:00:36,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-07 04:00:36,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-07 04:00:36,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-11-07 04:00:36,861 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2019-11-07 04:00:36,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:36,862 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-11-07 04:00:36,862 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:00:36,863 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-11-07 04:00:36,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 04:00:36,865 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:36,865 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:36,867 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:36,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:36,867 INFO L82 PathProgramCache]: Analyzing trace with hash -875331670, now seen corresponding path program 1 times [2019-11-07 04:00:36,868 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:36,868 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346115029] [2019-11-07 04:00:36,869 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:36,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:36,977 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 04:00:36,977 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346115029] [2019-11-07 04:00:36,979 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914138163] [2019-11-07 04:00:36,979 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 04:00:37,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:37,031 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:00:37,037 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:00:37,058 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 04:00:37,059 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:00:37,104 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 04:00:37,105 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [17854515] [2019-11-07 04:00:37,131 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-07 04:00:37,131 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:00:37,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:00:37,146 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:00:37,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:00:37,233 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 6 for LOIs [2019-11-07 04:00:37,425 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2019-11-07 04:00:37,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 3 for LOIs [2019-11-07 04:00:37,445 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:00:37,858 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 40 [2019-11-07 04:00:38,015 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:00:38,015 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 9] total 15 [2019-11-07 04:00:38,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012371492] [2019-11-07 04:00:38,019 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-07 04:00:38,020 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:00:38,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-07 04:00:38,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-11-07 04:00:38,023 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 15 states. [2019-11-07 04:00:38,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:38,532 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2019-11-07 04:00:38,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-07 04:00:38,532 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 12 [2019-11-07 04:00:38,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:38,534 INFO L225 Difference]: With dead ends: 42 [2019-11-07 04:00:38,534 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 04:00:38,535 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2019-11-07 04:00:38,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 04:00:38,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 18. [2019-11-07 04:00:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 04:00:38,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-07 04:00:38,541 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 12 [2019-11-07 04:00:38,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:38,542 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-07 04:00:38,542 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-07 04:00:38,543 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-07 04:00:38,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 04:00:38,544 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:38,544 INFO L410 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:38,744 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:38,745 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:38,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:38,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1822492047, now seen corresponding path program 2 times [2019-11-07 04:00:38,746 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:38,746 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970509257] [2019-11-07 04:00:38,746 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:38,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:38,812 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:38,812 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970509257] [2019-11-07 04:00:38,813 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877581141] [2019-11-07 04:00:38,813 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:38,842 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 04:00:38,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:00:38,846 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 04:00:38,847 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:00:38,853 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:38,854 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:00:38,924 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:38,924 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [362282422] [2019-11-07 04:00:38,930 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-07 04:00:38,930 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:00:38,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:00:38,931 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:00:38,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:00:38,967 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 6 for LOIs [2019-11-07 04:00:39,149 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2019-11-07 04:00:39,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 3 for LOIs [2019-11-07 04:00:39,161 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:00:39,441 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 40 [2019-11-07 04:00:39,501 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:00:39,501 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 9] total 21 [2019-11-07 04:00:39,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683153036] [2019-11-07 04:00:39,502 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 04:00:39,502 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:00:39,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 04:00:39,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=320, Unknown=0, NotChecked=0, Total=420 [2019-11-07 04:00:39,504 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 21 states. [2019-11-07 04:00:40,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:40,067 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2019-11-07 04:00:40,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-07 04:00:40,068 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 15 [2019-11-07 04:00:40,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:40,069 INFO L225 Difference]: With dead ends: 57 [2019-11-07 04:00:40,069 INFO L226 Difference]: Without dead ends: 44 [2019-11-07 04:00:40,070 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=258, Invalid=864, Unknown=0, NotChecked=0, Total=1122 [2019-11-07 04:00:40,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-07 04:00:40,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 24. [2019-11-07 04:00:40,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 04:00:40,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-11-07 04:00:40,077 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 15 [2019-11-07 04:00:40,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:40,078 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-11-07 04:00:40,078 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 04:00:40,078 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-11-07 04:00:40,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 04:00:40,079 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:40,079 INFO L410 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:40,283 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:40,284 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:40,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:40,284 INFO L82 PathProgramCache]: Analyzing trace with hash 995770287, now seen corresponding path program 3 times [2019-11-07 04:00:40,285 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:40,285 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056758275] [2019-11-07 04:00:40,285 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:40,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:40,416 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056758275] [2019-11-07 04:00:40,417 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627171772] [2019-11-07 04:00:40,417 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 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 04:00:40,457 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:00:40,457 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:00:40,458 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 04:00:40,461 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:00:40,472 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:40,473 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:00:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:40,659 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818177632] [2019-11-07 04:00:40,661 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-07 04:00:40,661 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:00:40,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:00:40,662 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:00:40,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:00:40,673 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 6 for LOIs [2019-11-07 04:00:40,708 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2019-11-07 04:00:40,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 3 for LOIs [2019-11-07 04:00:40,714 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:00:41,019 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:00:41,020 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 9] total 33 [2019-11-07 04:00:41,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99025633] [2019-11-07 04:00:41,021 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-07 04:00:41,021 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:00:41,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-07 04:00:41,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=734, Unknown=0, NotChecked=0, Total=1056 [2019-11-07 04:00:41,022 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 33 states. [2019-11-07 04:00:42,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:42,156 INFO L93 Difference]: Finished difference Result 87 states and 114 transitions. [2019-11-07 04:00:42,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-11-07 04:00:42,156 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 21 [2019-11-07 04:00:42,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:42,158 INFO L225 Difference]: With dead ends: 87 [2019-11-07 04:00:42,158 INFO L226 Difference]: Without dead ends: 68 [2019-11-07 04:00:42,160 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=912, Invalid=2394, Unknown=0, NotChecked=0, Total=3306 [2019-11-07 04:00:42,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-07 04:00:42,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 36. [2019-11-07 04:00:42,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 04:00:42,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2019-11-07 04:00:42,170 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 21 [2019-11-07 04:00:42,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:42,171 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2019-11-07 04:00:42,171 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-07 04:00:42,171 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2019-11-07 04:00:42,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 04:00:42,172 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:42,172 INFO L410 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:42,384 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:42,384 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:42,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:42,386 INFO L82 PathProgramCache]: Analyzing trace with hash 580545519, now seen corresponding path program 4 times [2019-11-07 04:00:42,386 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:42,387 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519735675] [2019-11-07 04:00:42,388 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:42,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:42,810 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:42,810 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519735675] [2019-11-07 04:00:42,811 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669469807] [2019-11-07 04:00:42,811 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 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 04:00:42,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:42,871 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 04:00:42,873 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:00:42,884 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:42,884 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:00:43,505 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:43,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085412192] [2019-11-07 04:00:43,506 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-07 04:00:43,506 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:00:43,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:00:43,507 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:00:43,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:00:43,522 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 6 for LOIs [2019-11-07 04:00:43,586 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 04:00:43,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 3 for LOIs [2019-11-07 04:00:43,594 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:00:43,937 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 04:00:44,034 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:00:44,035 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 9] total 57 [2019-11-07 04:00:44,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263833047] [2019-11-07 04:00:44,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-11-07 04:00:44,037 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:00:44,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-11-07 04:00:44,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1198, Invalid=1994, Unknown=0, NotChecked=0, Total=3192 [2019-11-07 04:00:44,039 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 57 states. [2019-11-07 04:00:46,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:46,821 INFO L93 Difference]: Finished difference Result 147 states and 198 transitions. [2019-11-07 04:00:46,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-11-07 04:00:46,821 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 33 [2019-11-07 04:00:46,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:46,825 INFO L225 Difference]: With dead ends: 147 [2019-11-07 04:00:46,825 INFO L226 Difference]: Without dead ends: 116 [2019-11-07 04:00:46,832 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2318 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3516, Invalid=7614, Unknown=0, NotChecked=0, Total=11130 [2019-11-07 04:00:46,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-11-07 04:00:46,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 60. [2019-11-07 04:00:46,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-07 04:00:46,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2019-11-07 04:00:46,860 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 33 [2019-11-07 04:00:46,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:46,861 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2019-11-07 04:00:46,861 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-11-07 04:00:46,861 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2019-11-07 04:00:46,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-07 04:00:46,868 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:46,869 INFO L410 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:47,073 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:47,074 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:47,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:47,074 INFO L82 PathProgramCache]: Analyzing trace with hash -800480145, now seen corresponding path program 5 times [2019-11-07 04:00:47,074 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:47,074 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111118458] [2019-11-07 04:00:47,075 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:47,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:00:48,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:48,151 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111118458] [2019-11-07 04:00:48,151 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626369468] [2019-11-07 04:00:48,151 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 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 04:00:48,256 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-11-07 04:00:48,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:00:48,258 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 48 conjunts are in the unsatisfiable core [2019-11-07 04:00:48,263 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:00:48,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:48,294 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:00:50,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:00:50,823 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065203779] [2019-11-07 04:00:50,824 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-07 04:00:50,824 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:00:50,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:00:50,825 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:00:50,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:00:50,833 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 6 for LOIs [2019-11-07 04:00:50,909 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 04:00:50,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 3 for LOIs [2019-11-07 04:00:50,920 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:00:51,320 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 04:00:51,463 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:00:51,464 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 9] total 105 [2019-11-07 04:00:51,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484251419] [2019-11-07 04:00:51,466 INFO L442 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-11-07 04:00:51,466 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:00:51,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-11-07 04:00:51,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4678, Invalid=6242, Unknown=0, NotChecked=0, Total=10920 [2019-11-07 04:00:51,470 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 105 states. [2019-11-07 04:00:59,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:59,375 INFO L93 Difference]: Finished difference Result 267 states and 366 transitions. [2019-11-07 04:00:59,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 199 states. [2019-11-07 04:00:59,375 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 57 [2019-11-07 04:00:59,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:59,378 INFO L225 Difference]: With dead ends: 267 [2019-11-07 04:00:59,378 INFO L226 Difference]: Without dead ends: 212 [2019-11-07 04:00:59,387 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7562 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=13908, Invalid=26694, Unknown=0, NotChecked=0, Total=40602 [2019-11-07 04:00:59,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-11-07 04:00:59,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 108. [2019-11-07 04:00:59,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-11-07 04:00:59,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2019-11-07 04:00:59,406 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 57 [2019-11-07 04:00:59,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:59,406 INFO L462 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2019-11-07 04:00:59,407 INFO L463 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-11-07 04:00:59,407 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2019-11-07 04:00:59,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-11-07 04:00:59,408 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:00:59,408 INFO L410 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:00:59,610 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:59,611 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:00:59,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:00:59,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1675389585, now seen corresponding path program 6 times [2019-11-07 04:00:59,611 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:00:59,612 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299271722] [2019-11-07 04:00:59,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:00:59,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:03,554 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:03,555 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299271722] [2019-11-07 04:01:03,555 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377083621] [2019-11-07 04:01:03,555 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 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 04:01:03,692 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:01:03,692 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:01:03,695 INFO L256 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 96 conjunts are in the unsatisfiable core [2019-11-07 04:01:03,700 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:01:03,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:03,736 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:01:13,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:13,834 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019902772] [2019-11-07 04:01:13,835 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-07 04:01:13,835 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:01:13,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:01:13,836 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:01:13,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:01:13,844 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2019-11-07 04:01:13,886 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2019-11-07 04:01:13,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 3 for LOIs [2019-11-07 04:01:13,892 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:01:14,447 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 04:01:14,567 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:01:14,568 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97, 9] total 201 [2019-11-07 04:01:14,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336974388] [2019-11-07 04:01:14,570 INFO L442 AbstractCegarLoop]: Interpolant automaton has 201 states [2019-11-07 04:01:14,570 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:01:14,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 201 interpolants. [2019-11-07 04:01:14,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18550, Invalid=21650, Unknown=0, NotChecked=0, Total=40200 [2019-11-07 04:01:14,577 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 201 states.