/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/array-crafted/zero_sum_const5.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:18:40,111 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:18:40,113 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:18:40,128 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:18:40,153 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:18:40,156 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:18:40,158 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:18:40,160 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:18:40,161 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:18:40,163 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:18:40,165 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:18:40,170 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:18:40,174 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:18:40,175 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:18:40,176 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:18:40,176 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:18:40,178 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:18:40,187 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:18:40,188 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:18:40,189 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:18:40,190 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 01:18:40,203 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:18:40,203 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:18:40,205 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:18:40,205 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:18:40,205 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:18:40,205 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:18:40,205 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:18:40,206 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:18:40,206 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:18:40,206 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:18:40,206 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:18:40,206 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:18:40,207 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:18:40,207 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:18:40,207 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:18:40,207 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:18:40,207 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:18:40,208 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:18:40,208 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:18:40,208 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:18:40,208 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:18:40,208 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:18:40,209 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:18:40,209 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:18:40,209 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:18:40,209 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:18:40,209 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:18:40,210 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:18:40,210 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 01:18:40,549 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:18:40,570 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:18:40,573 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:18:40,575 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:18:40,575 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:18:40,576 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const5.c [2019-11-07 01:18:40,654 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/631282232/5dd88e9d61244d9b8f681bbe6ae74104/FLAG126dd2a30 [2019-11-07 01:18:41,096 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:18:41,099 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const5.c [2019-11-07 01:18:41,106 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/631282232/5dd88e9d61244d9b8f681bbe6ae74104/FLAG126dd2a30 [2019-11-07 01:18:41,504 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/631282232/5dd88e9d61244d9b8f681bbe6ae74104 [2019-11-07 01:18:41,529 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:18:41,531 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:18:41,535 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:41,536 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:18:41,546 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:18:41,547 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,555 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56d4579d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41, skipping insertion in model container [2019-11-07 01:18:41,555 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,576 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:18:41,628 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:18:41,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:41,943 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:18:42,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:42,069 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:18:42,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42 WrapperNode [2019-11-07 01:18:42,069 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:42,070 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:18:42,070 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:18:42,070 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:18:42,080 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,081 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,088 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,089 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,107 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,109 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (1/1) ... [2019-11-07 01:18:42,112 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:18:42,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:18:42,113 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:18:42,113 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:18:42,114 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (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 01:18:42,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:18:42,168 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:18:42,168 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:18:42,168 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:18:42,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:18:42,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:18:42,169 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:18:42,169 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-11-07 01:18:42,169 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 01:18:42,169 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:18:42,169 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 01:18:42,170 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:18:42,170 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:18:42,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:18:42,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:18:42,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:18:42,732 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:18:42,733 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-07 01:18:42,734 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:42 BoogieIcfgContainer [2019-11-07 01:18:42,734 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:18:42,736 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:18:42,736 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:18:42,739 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:18:42,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:18:41" (1/3) ... [2019-11-07 01:18:42,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5930f504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:42, skipping insertion in model container [2019-11-07 01:18:42,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:42" (2/3) ... [2019-11-07 01:18:42,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5930f504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:42, skipping insertion in model container [2019-11-07 01:18:42,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:42" (3/3) ... [2019-11-07 01:18:42,743 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const5.c [2019-11-07 01:18:42,754 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:18:42,762 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:18:42,774 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:18:42,801 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:18:42,801 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:18:42,801 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:18:42,802 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:18:42,802 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:18:42,802 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:18:42,802 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:18:42,802 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:18:42,819 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-11-07 01:18:42,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 01:18:42,825 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:42,826 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:42,828 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:42,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:42,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1883974854, now seen corresponding path program 1 times [2019-11-07 01:18:42,843 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:42,843 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448815597] [2019-11-07 01:18:42,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:42,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,074 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 01:18:43,075 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448815597] [2019-11-07 01:18:43,076 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:43,077 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:18:43,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179706363] [2019-11-07 01:18:43,084 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:18:43,085 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:43,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:18:43,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:18:43,107 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2019-11-07 01:18:43,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,267 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2019-11-07 01:18:43,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:18:43,271 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2019-11-07 01:18:43,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,283 INFO L225 Difference]: With dead ends: 53 [2019-11-07 01:18:43,283 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 01:18:43,288 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:18:43,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 01:18:43,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-07 01:18:43,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:18:43,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 51 transitions. [2019-11-07 01:18:43,341 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 51 transitions. Word has length 21 [2019-11-07 01:18:43,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,342 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 51 transitions. [2019-11-07 01:18:43,342 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:18:43,342 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 51 transitions. [2019-11-07 01:18:43,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-07 01:18:43,345 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,345 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:43,346 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,346 INFO L82 PathProgramCache]: Analyzing trace with hash 75212444, now seen corresponding path program 1 times [2019-11-07 01:18:43,347 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,347 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416760290] [2019-11-07 01:18:43,347 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:18:43,423 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416760290] [2019-11-07 01:18:43,423 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:43,423 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:18:43,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231659611] [2019-11-07 01:18:43,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:18:43,426 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:43,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:18:43,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:18:43,427 INFO L87 Difference]: Start difference. First operand 32 states and 51 transitions. Second operand 3 states. [2019-11-07 01:18:43,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,501 INFO L93 Difference]: Finished difference Result 58 states and 96 transitions. [2019-11-07 01:18:43,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:18:43,502 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2019-11-07 01:18:43,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,503 INFO L225 Difference]: With dead ends: 58 [2019-11-07 01:18:43,503 INFO L226 Difference]: Without dead ends: 33 [2019-11-07 01:18:43,505 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 01:18:43,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-07 01:18:43,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-11-07 01:18:43,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-07 01:18:43,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 52 transitions. [2019-11-07 01:18:43,513 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 52 transitions. Word has length 22 [2019-11-07 01:18:43,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,514 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 52 transitions. [2019-11-07 01:18:43,514 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:18:43,514 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 52 transitions. [2019-11-07 01:18:43,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-07 01:18:43,515 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,515 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:43,516 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1456530685, now seen corresponding path program 1 times [2019-11-07 01:18:43,518 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,518 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400624254] [2019-11-07 01:18:43,519 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:18:43,632 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400624254] [2019-11-07 01:18:43,632 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:43,632 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:18:43,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045493899] [2019-11-07 01:18:43,634 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:18:43,634 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:43,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:18:43,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:18:43,635 INFO L87 Difference]: Start difference. First operand 33 states and 52 transitions. Second operand 4 states. [2019-11-07 01:18:43,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,763 INFO L93 Difference]: Finished difference Result 56 states and 92 transitions. [2019-11-07 01:18:43,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:18:43,763 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2019-11-07 01:18:43,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,764 INFO L225 Difference]: With dead ends: 56 [2019-11-07 01:18:43,765 INFO L226 Difference]: Without dead ends: 33 [2019-11-07 01:18:43,765 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:18:43,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-07 01:18:43,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-11-07 01:18:43,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-07 01:18:43,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2019-11-07 01:18:43,773 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 23 [2019-11-07 01:18:43,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,774 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2019-11-07 01:18:43,774 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:18:43,774 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2019-11-07 01:18:43,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:18:43,775 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,775 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:43,775 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,776 INFO L82 PathProgramCache]: Analyzing trace with hash 2063924474, now seen corresponding path program 1 times [2019-11-07 01:18:43,776 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,776 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126690852] [2019-11-07 01:18:43,777 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,876 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:18:43,876 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126690852] [2019-11-07 01:18:43,876 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413521706] [2019-11-07 01:18:43,877 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 01:18:43,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,965 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:43,973 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:44,031 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:18:44,031 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:44,066 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:18:44,067 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1908105010] [2019-11-07 01:18:44,095 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-11-07 01:18:44,096 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:44,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:44,117 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:44,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:44,296 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:45,240 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:45,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:45,247 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:45,926 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:45,926 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4, 11] total 19 [2019-11-07 01:18:45,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825086983] [2019-11-07 01:18:45,929 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:18:45,930 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:45,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:18:45,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:18:45,933 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand 19 states. [2019-11-07 01:18:47,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:47,040 INFO L93 Difference]: Finished difference Result 69 states and 99 transitions. [2019-11-07 01:18:47,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:47,041 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 32 [2019-11-07 01:18:47,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:47,042 INFO L225 Difference]: With dead ends: 69 [2019-11-07 01:18:47,042 INFO L226 Difference]: Without dead ends: 44 [2019-11-07 01:18:47,043 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:18:47,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-07 01:18:47,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-11-07 01:18:47,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-07 01:18:47,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2019-11-07 01:18:47,062 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 32 [2019-11-07 01:18:47,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:47,062 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2019-11-07 01:18:47,062 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:18:47,062 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2019-11-07 01:18:47,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-07 01:18:47,067 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:47,067 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:47,270 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:47,272 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:47,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:47,273 INFO L82 PathProgramCache]: Analyzing trace with hash 981880454, now seen corresponding path program 2 times [2019-11-07 01:18:47,273 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:47,274 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104274045] [2019-11-07 01:18:47,274 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:47,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:48,374 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:48,375 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104274045] [2019-11-07 01:18:48,375 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379548473] [2019-11-07 01:18:48,375 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 01:18:48,488 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:18:48,488 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:48,492 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 92 conjunts are in the unsatisfiable core [2019-11-07 01:18:48,500 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:48,855 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:18:48,855 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:49,273 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:18:49,273 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1307808768] [2019-11-07 01:18:49,278 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-11-07 01:18:49,278 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:49,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:49,279 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:49,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:49,306 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:49,924 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:49,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:49,933 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:50,814 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:50,814 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11, 11] total 38 [2019-11-07 01:18:50,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552700831] [2019-11-07 01:18:50,815 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-11-07 01:18:50,816 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:50,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-11-07 01:18:50,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1286, Unknown=0, NotChecked=0, Total=1406 [2019-11-07 01:18:50,817 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand 38 states. [2019-11-07 01:18:53,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:53,077 INFO L93 Difference]: Finished difference Result 77 states and 96 transitions. [2019-11-07 01:18:53,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-07 01:18:53,077 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 43 [2019-11-07 01:18:53,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:53,079 INFO L225 Difference]: With dead ends: 77 [2019-11-07 01:18:53,079 INFO L226 Difference]: Without dead ends: 72 [2019-11-07 01:18:53,081 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 94 SyntacticMatches, 35 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=238, Invalid=2518, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 01:18:53,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-07 01:18:53,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2019-11-07 01:18:53,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-07 01:18:53,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2019-11-07 01:18:53,095 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 43 [2019-11-07 01:18:53,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:53,095 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2019-11-07 01:18:53,095 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-11-07 01:18:53,095 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2019-11-07 01:18:53,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-07 01:18:53,096 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:53,097 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:53,302 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:53,303 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:53,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:53,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1460027300, now seen corresponding path program 3 times [2019-11-07 01:18:53,303 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:53,304 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618087671] [2019-11-07 01:18:53,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:53,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:53,377 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-07 01:18:53,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618087671] [2019-11-07 01:18:53,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055866737] [2019-11-07 01:18:53,378 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 01:18:53,462 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:53,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:53,463 INFO L256 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:53,466 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:53,520 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-07 01:18:53,520 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:53,567 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-07 01:18:53,567 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [670523264] [2019-11-07 01:18:53,570 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-11-07 01:18:53,571 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:53,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:53,572 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:53,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:53,601 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:54,140 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:54,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:54,152 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:54,276 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2019-11-07 01:18:55,039 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:55,039 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-11-07 01:18:55,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665670778] [2019-11-07 01:18:55,041 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:18:55,041 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:55,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:18:55,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:18:55,048 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand 25 states. [2019-11-07 01:18:56,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:56,689 INFO L93 Difference]: Finished difference Result 148 states and 194 transitions. [2019-11-07 01:18:56,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 01:18:56,689 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 44 [2019-11-07 01:18:56,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:56,692 INFO L225 Difference]: With dead ends: 148 [2019-11-07 01:18:56,692 INFO L226 Difference]: Without dead ends: 85 [2019-11-07 01:18:56,708 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 112 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=261, Invalid=1545, Unknown=0, NotChecked=0, Total=1806 [2019-11-07 01:18:56,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-11-07 01:18:56,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 78. [2019-11-07 01:18:56,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-11-07 01:18:56,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 96 transitions. [2019-11-07 01:18:56,756 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 96 transitions. Word has length 44 [2019-11-07 01:18:56,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:56,760 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 96 transitions. [2019-11-07 01:18:56,760 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:18:56,760 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 96 transitions. [2019-11-07 01:18:56,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:18:56,769 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:56,769 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:56,972 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:56,972 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:56,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:56,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1604823922, now seen corresponding path program 4 times [2019-11-07 01:18:56,973 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:56,975 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777361008] [2019-11-07 01:18:56,975 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:57,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:57,105 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:18:57,106 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777361008] [2019-11-07 01:18:57,106 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161019156] [2019-11-07 01:18:57,106 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 01:18:57,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:57,197 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:57,202 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:57,261 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:18:57,261 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:57,304 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:18:57,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1916244912] [2019-11-07 01:18:57,306 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-11-07 01:18:57,306 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:57,307 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:57,307 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:57,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:57,327 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:18:57,830 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:57,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:57,855 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:58,422 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:58,422 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-11-07 01:18:58,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651345053] [2019-11-07 01:18:58,424 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:18:58,424 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:58,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:18:58,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:18:58,425 INFO L87 Difference]: Start difference. First operand 78 states and 96 transitions. Second operand 25 states. [2019-11-07 01:18:59,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:59,900 INFO L93 Difference]: Finished difference Result 84 states and 102 transitions. [2019-11-07 01:18:59,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:18:59,900 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 45 [2019-11-07 01:18:59,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:59,902 INFO L225 Difference]: With dead ends: 84 [2019-11-07 01:18:59,902 INFO L226 Difference]: Without dead ends: 55 [2019-11-07 01:18:59,904 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 114 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:59,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-07 01:18:59,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-11-07 01:18:59,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-07 01:18:59,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2019-11-07 01:18:59,913 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 45 [2019-11-07 01:18:59,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:59,914 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2019-11-07 01:18:59,914 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:18:59,914 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2019-11-07 01:18:59,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-07 01:18:59,915 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:59,916 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:00,116 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:00,117 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:00,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:00,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1820325702, now seen corresponding path program 5 times [2019-11-07 01:19:00,118 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:00,118 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565825621] [2019-11-07 01:19:00,118 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:00,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:01,130 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 37 [2019-11-07 01:19:01,468 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 49 [2019-11-07 01:19:01,630 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2019-11-07 01:19:01,771 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 34 [2019-11-07 01:19:01,954 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 42 [2019-11-07 01:19:02,131 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 46 [2019-11-07 01:19:02,298 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 36 [2019-11-07 01:19:02,519 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 54 [2019-11-07 01:19:02,658 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 37 [2019-11-07 01:19:02,847 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 43 [2019-11-07 01:19:03,049 WARN L191 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2019-11-07 01:19:03,276 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2019-11-07 01:19:03,473 WARN L191 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 52 [2019-11-07 01:19:03,673 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 38 [2019-11-07 01:19:03,886 WARN L191 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 54 [2019-11-07 01:19:04,100 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 48 [2019-11-07 01:19:04,259 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2019-11-07 01:19:04,419 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 35 [2019-11-07 01:19:04,636 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 53 [2019-11-07 01:19:04,815 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2019-11-07 01:19:05,320 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2019-11-07 01:19:05,913 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:05,913 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565825621] [2019-11-07 01:19:05,914 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099103816] [2019-11-07 01:19:05,914 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 01:19:06,021 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:06,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:06,026 WARN L254 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 146 conjunts are in the unsatisfiable core [2019-11-07 01:19:06,031 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:08,014 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 3 proven. 60 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:19:08,015 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:11,764 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:19:11,765 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2009429407] [2019-11-07 01:19:11,769 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-11-07 01:19:11,769 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:11,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:11,770 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:11,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:11,791 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:19:12,328 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:12,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:12,334 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:13,619 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:13,620 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 16, 13, 11] total 72 [2019-11-07 01:19:13,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816217892] [2019-11-07 01:19:13,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-11-07 01:19:13,622 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:13,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-11-07 01:19:13,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=491, Invalid=4621, Unknown=0, NotChecked=0, Total=5112 [2019-11-07 01:19:13,624 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand 72 states. [2019-11-07 01:19:14,780 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 66 [2019-11-07 01:19:15,510 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 59 [2019-11-07 01:19:15,739 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 67 [2019-11-07 01:19:16,144 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 50 [2019-11-07 01:19:16,745 WARN L191 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 109 [2019-11-07 01:19:17,044 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 72 [2019-11-07 01:19:17,492 WARN L191 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 60 [2019-11-07 01:19:17,777 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 60 [2019-11-07 01:19:20,268 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 43 [2019-11-07 01:19:20,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:20,904 INFO L93 Difference]: Finished difference Result 97 states and 116 transitions. [2019-11-07 01:19:20,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-07 01:19:20,905 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 54 [2019-11-07 01:19:20,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:20,907 INFO L225 Difference]: With dead ends: 97 [2019-11-07 01:19:20,907 INFO L226 Difference]: Without dead ends: 92 [2019-11-07 01:19:20,910 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 92 SyntacticMatches, 48 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5808 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=898, Invalid=8222, Unknown=0, NotChecked=0, Total=9120 [2019-11-07 01:19:20,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-11-07 01:19:20,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 89. [2019-11-07 01:19:20,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-11-07 01:19:20,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 108 transitions. [2019-11-07 01:19:20,931 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 108 transitions. Word has length 54 [2019-11-07 01:19:20,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:20,931 INFO L462 AbstractCegarLoop]: Abstraction has 89 states and 108 transitions. [2019-11-07 01:19:20,932 INFO L463 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-11-07 01:19:20,932 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 108 transitions. [2019-11-07 01:19:20,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-07 01:19:20,933 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:20,933 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:21,137 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:21,137 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:21,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:21,137 INFO L82 PathProgramCache]: Analyzing trace with hash -1073209164, now seen corresponding path program 6 times [2019-11-07 01:19:21,138 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:21,138 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786826163] [2019-11-07 01:19:21,138 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:21,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:21,291 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2019-11-07 01:19:21,291 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786826163] [2019-11-07 01:19:21,291 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147178016] [2019-11-07 01:19:21,292 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