/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-examples/standard_copy4_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:21:49,181 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:21:49,231 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:21:49,233 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:21:49,235 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:21:49,237 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:21:49,238 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:21:49,239 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:21:49,241 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:21:49,246 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:21:49,250 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:21:49,254 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:21:49,257 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:21:49,257 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:21:49,259 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:21:49,271 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:21:49,272 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:21:49,272 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:21:49,273 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 01:21:49,308 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:21:49,308 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:21:49,311 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:21:49,312 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:21:49,312 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:21:49,312 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:21:49,312 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:21:49,313 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:21:49,313 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:21:49,313 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:21:49,313 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:21:49,313 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:21:49,314 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:21:49,318 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:21:49,318 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:21:49,318 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:21:49,318 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:21:49,318 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:21:49,319 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:21:49,319 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:21:49,319 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:21:49,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:21:49,320 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:21:49,320 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:21:49,320 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:21:49,320 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:21:49,320 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:21:49,321 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:21:49,321 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 01:21:49,644 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:21:49,665 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:21:49,668 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:21:49,670 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:21:49,670 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:21:49,671 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy4_ground-2.i [2019-11-07 01:21:49,743 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db5b92fb9/0f07eaa0a8c5469eaeea0bac60b2d94f/FLAGf473e31c9 [2019-11-07 01:21:50,157 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:21:50,158 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy4_ground-2.i [2019-11-07 01:21:50,165 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db5b92fb9/0f07eaa0a8c5469eaeea0bac60b2d94f/FLAGf473e31c9 [2019-11-07 01:21:50,599 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db5b92fb9/0f07eaa0a8c5469eaeea0bac60b2d94f [2019-11-07 01:21:50,609 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:21:50,610 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:21:50,611 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:21:50,612 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:21:50,616 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:21:50,616 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:50,622 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c8606dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50, skipping insertion in model container [2019-11-07 01:21:50,623 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:50,630 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:21:50,648 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:21:50,852 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:21:50,861 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:21:50,905 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:21:50,929 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:21:50,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50 WrapperNode [2019-11-07 01:21:50,930 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:21:50,931 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:21:50,931 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:21:50,931 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:21:51,088 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,095 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,115 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,138 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,149 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,153 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (1/1) ... [2019-11-07 01:21:51,157 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:21:51,158 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:21:51,158 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:21:51,159 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:21:51,160 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (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 01:21:51,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:21:51,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:21:51,230 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:21:51,231 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:21:51,231 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:21:51,232 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:21:51,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:21:51,234 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:21:51,234 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:21:51,234 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:21:51,234 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:21:51,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:21:51,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:21:51,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:21:51,741 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:21:51,742 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-11-07 01:21:51,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:21:51 BoogieIcfgContainer [2019-11-07 01:21:51,743 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:21:51,744 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:21:51,745 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:21:51,748 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:21:51,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:21:50" (1/3) ... [2019-11-07 01:21:51,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49a0a6c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:21:51, skipping insertion in model container [2019-11-07 01:21:51,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:50" (2/3) ... [2019-11-07 01:21:51,750 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49a0a6c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:21:51, skipping insertion in model container [2019-11-07 01:21:51,750 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:21:51" (3/3) ... [2019-11-07 01:21:51,752 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy4_ground-2.i [2019-11-07 01:21:51,762 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:21:51,771 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:21:51,783 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:21:51,808 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:21:51,808 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:21:51,808 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:21:51,808 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:21:51,808 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:21:51,809 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:21:51,809 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:21:51,809 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:21:51,827 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:21:51,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:21:51,834 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:51,835 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:51,836 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:51,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:51,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1907873763, now seen corresponding path program 1 times [2019-11-07 01:21:51,853 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:51,853 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789341058] [2019-11-07 01:21:51,854 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:51,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:52,025 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 01:21:52,026 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789341058] [2019-11-07 01:21:52,027 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:21:52,027 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:21:52,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107041833] [2019-11-07 01:21:52,032 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:21:52,032 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:52,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:21:52,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:21:52,045 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2019-11-07 01:21:52,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:52,086 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2019-11-07 01:21:52,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:21:52,089 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-07 01:21:52,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:52,098 INFO L225 Difference]: With dead ends: 39 [2019-11-07 01:21:52,098 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:21:52,102 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 01:21:52,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:21:52,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:21:52,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:21:52,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2019-11-07 01:21:52,154 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 15 [2019-11-07 01:21:52,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:52,155 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2019-11-07 01:21:52,156 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:21:52,156 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2019-11-07 01:21:52,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 01:21:52,158 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:52,159 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:52,159 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:52,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:52,160 INFO L82 PathProgramCache]: Analyzing trace with hash 309375907, now seen corresponding path program 1 times [2019-11-07 01:21:52,160 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:52,161 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113729513] [2019-11-07 01:21:52,162 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:52,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:52,271 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 01:21:52,272 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113729513] [2019-11-07 01:21:52,274 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:21:52,274 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:21:52,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116496509] [2019-11-07 01:21:52,276 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:21:52,276 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:52,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:21:52,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:21:52,278 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand 3 states. [2019-11-07 01:21:52,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:52,323 INFO L93 Difference]: Finished difference Result 36 states and 48 transitions. [2019-11-07 01:21:52,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:21:52,324 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-07 01:21:52,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:52,325 INFO L225 Difference]: With dead ends: 36 [2019-11-07 01:21:52,325 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 01:21:52,326 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 01:21:52,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 01:21:52,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 01:21:52,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:21:52,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-11-07 01:21:52,336 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2019-11-07 01:21:52,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:52,337 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-11-07 01:21:52,337 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:21:52,337 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-11-07 01:21:52,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:21:52,338 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:52,338 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] [2019-11-07 01:21:52,338 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:52,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:52,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1949160451, now seen corresponding path program 1 times [2019-11-07 01:21:52,339 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:52,340 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988423513] [2019-11-07 01:21:52,340 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:52,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:52,425 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:21:52,426 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988423513] [2019-11-07 01:21:52,426 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187009465] [2019-11-07 01:21:52,426 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 01:21:52,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:52,515 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:21:52,524 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:52,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:21:52,570 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:52,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:21:52,608 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [348073569] [2019-11-07 01:21:52,635 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:21:52,635 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:52,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:52,648 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:52,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:52,780 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:53,227 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:21:53,528 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:21:54,047 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:21:54,102 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:54,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:54,113 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:21:54,407 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:21:54,407 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:21:54,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843360481] [2019-11-07 01:21:54,408 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:21:54,409 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:54,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:21:54,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:21:54,410 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 18 states. [2019-11-07 01:21:55,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:55,104 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2019-11-07 01:21:55,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:21:55,106 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2019-11-07 01:21:55,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:55,107 INFO L225 Difference]: With dead ends: 57 [2019-11-07 01:21:55,108 INFO L226 Difference]: Without dead ends: 40 [2019-11-07 01:21:55,110 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:21:55,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-07 01:21:55,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 31. [2019-11-07 01:21:55,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-07 01:21:55,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2019-11-07 01:21:55,118 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 20 [2019-11-07 01:21:55,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:55,118 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2019-11-07 01:21:55,118 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:21:55,119 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2019-11-07 01:21:55,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-07 01:21:55,120 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:55,120 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:55,323 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:21:55,324 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:55,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:55,325 INFO L82 PathProgramCache]: Analyzing trace with hash -519859613, now seen corresponding path program 2 times [2019-11-07 01:21:55,325 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:55,325 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541740585] [2019-11-07 01:21:55,326 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:55,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:55,415 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:21:55,415 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541740585] [2019-11-07 01:21:55,416 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886114373] [2019-11-07 01:21:55,416 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 01:21:55,480 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:21:55,481 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:21:55,482 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:21:55,485 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:55,509 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-11-07 01:21:55,509 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:55,543 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-11-07 01:21:55,543 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1984912774] [2019-11-07 01:21:55,545 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:21:55,545 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:55,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:55,546 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:55,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:55,567 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:56,473 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:56,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:56,482 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:21:56,750 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:21:56,750 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 11] total 23 [2019-11-07 01:21:56,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998346772] [2019-11-07 01:21:56,752 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-07 01:21:56,752 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:56,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-07 01:21:56,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2019-11-07 01:21:56,753 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 23 states. [2019-11-07 01:21:57,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:57,689 INFO L93 Difference]: Finished difference Result 78 states and 104 transitions. [2019-11-07 01:21:57,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-07 01:21:57,690 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 27 [2019-11-07 01:21:57,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:57,693 INFO L225 Difference]: With dead ends: 78 [2019-11-07 01:21:57,693 INFO L226 Difference]: Without dead ends: 57 [2019-11-07 01:21:57,694 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=1403, Unknown=0, NotChecked=0, Total=1640 [2019-11-07 01:21:57,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-07 01:21:57,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 48. [2019-11-07 01:21:57,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-07 01:21:57,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2019-11-07 01:21:57,716 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2019-11-07 01:21:57,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:57,716 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2019-11-07 01:21:57,716 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-07 01:21:57,717 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2019-11-07 01:21:57,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-07 01:21:57,720 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:57,720 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:57,923 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:21:57,924 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:57,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:57,925 INFO L82 PathProgramCache]: Analyzing trace with hash -122686685, now seen corresponding path program 3 times [2019-11-07 01:21:57,925 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:57,926 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052828600] [2019-11-07 01:21:57,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:58,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:58,153 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-07 01:21:58,154 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052828600] [2019-11-07 01:21:58,154 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237096995] [2019-11-07 01:21:58,154 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 01:21:58,272 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:21:58,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:21:58,275 INFO L256 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 01:21:58,280 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:58,360 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-07 01:21:58,360 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:58,458 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-07 01:21:58,458 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1725142723] [2019-11-07 01:21:58,461 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:21:58,461 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:58,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:58,462 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:58,462 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:58,481 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:58,752 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:21:59,069 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:21:59,472 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:59,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:59,479 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:21:59,780 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:21:59,780 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8, 11] total 31 [2019-11-07 01:21:59,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56389189] [2019-11-07 01:21:59,781 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-07 01:21:59,782 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:59,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-07 01:21:59,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=775, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:21:59,783 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 31 states. [2019-11-07 01:22:01,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:01,084 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2019-11-07 01:22:01,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-07 01:22:01,091 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 44 [2019-11-07 01:22:01,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:01,092 INFO L225 Difference]: With dead ends: 105 [2019-11-07 01:22:01,092 INFO L226 Difference]: Without dead ends: 68 [2019-11-07 01:22:01,094 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=473, Invalid=2719, Unknown=0, NotChecked=0, Total=3192 [2019-11-07 01:22:01,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-07 01:22:01,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 59. [2019-11-07 01:22:01,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-07 01:22:01,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 64 transitions. [2019-11-07 01:22:01,113 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 64 transitions. Word has length 44 [2019-11-07 01:22:01,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:01,114 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 64 transitions. [2019-11-07 01:22:01,114 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-07 01:22:01,114 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 64 transitions. [2019-11-07 01:22:01,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-07 01:22:01,115 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:01,116 INFO L410 BasicCegarLoop]: trace histogram [12, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:01,317 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:01,318 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:01,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:01,319 INFO L82 PathProgramCache]: Analyzing trace with hash 444261821, now seen corresponding path program 4 times [2019-11-07 01:22:01,319 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:01,320 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838185453] [2019-11-07 01:22:01,320 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:01,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:01,512 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-11-07 01:22:01,512 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838185453] [2019-11-07 01:22:01,512 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88853965] [2019-11-07 01:22:01,512 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 01:22:01,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:01,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-07 01:22:01,607 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:01,762 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:22:01,762 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:02,075 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:22:02,076 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1786378231] [2019-11-07 01:22:02,077 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:22:02,077 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:02,078 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:02,078 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:02,078 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:02,095 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:02,872 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:02,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:02,886 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:03,227 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:03,227 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 15, 11] total 46 [2019-11-07 01:22:03,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082777052] [2019-11-07 01:22:03,230 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-11-07 01:22:03,230 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:03,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-11-07 01:22:03,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=1619, Unknown=0, NotChecked=0, Total=2070 [2019-11-07 01:22:03,232 INFO L87 Difference]: Start difference. First operand 59 states and 64 transitions. Second operand 46 states. [2019-11-07 01:22:05,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:05,225 INFO L93 Difference]: Finished difference Result 127 states and 154 transitions. [2019-11-07 01:22:05,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-11-07 01:22:05,227 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 55 [2019-11-07 01:22:05,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:05,228 INFO L225 Difference]: With dead ends: 127 [2019-11-07 01:22:05,228 INFO L226 Difference]: Without dead ends: 86 [2019-11-07 01:22:05,232 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1839 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1363, Invalid=6119, Unknown=0, NotChecked=0, Total=7482 [2019-11-07 01:22:05,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-11-07 01:22:05,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2019-11-07 01:22:05,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-11-07 01:22:05,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2019-11-07 01:22:05,245 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 55 [2019-11-07 01:22:05,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:05,245 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2019-11-07 01:22:05,245 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-11-07 01:22:05,245 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2019-11-07 01:22:05,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-07 01:22:05,247 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:05,247 INFO L410 BasicCegarLoop]: trace histogram [26, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:05,451 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:05,451 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:05,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:05,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1175045661, now seen corresponding path program 5 times [2019-11-07 01:22:05,452 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:05,452 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557177223] [2019-11-07 01:22:05,452 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:05,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:05,750 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-11-07 01:22:05,750 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557177223] [2019-11-07 01:22:05,751 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585063769] [2019-11-07 01:22:05,751 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 01:22:09,549 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-07 01:22:09,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:09,555 INFO L256 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-07 01:22:09,559 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:09,597 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-11-07 01:22:09,597 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:09,720 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2019-11-07 01:22:09,721 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1568324689] [2019-11-07 01:22:09,722 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:22:09,722 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:09,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:09,723 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:09,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:09,739 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:10,566 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:10,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:10,572 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:10,821 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:10,821 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 31 [2019-11-07 01:22:10,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544605703] [2019-11-07 01:22:10,823 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-07 01:22:10,823 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:10,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-07 01:22:10,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=690, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:22:10,824 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 31 states. [2019-11-07 01:22:12,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:12,214 INFO L93 Difference]: Finished difference Result 162 states and 210 transitions. [2019-11-07 01:22:12,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-07 01:22:12,215 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 73 [2019-11-07 01:22:12,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:12,217 INFO L225 Difference]: With dead ends: 162 [2019-11-07 01:22:12,218 INFO L226 Difference]: Without dead ends: 126 [2019-11-07 01:22:12,219 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=736, Invalid=2456, Unknown=0, NotChecked=0, Total=3192 [2019-11-07 01:22:12,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-11-07 01:22:12,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 117. [2019-11-07 01:22:12,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2019-11-07 01:22:12,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 122 transitions. [2019-11-07 01:22:12,234 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 122 transitions. Word has length 73 [2019-11-07 01:22:12,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:12,235 INFO L462 AbstractCegarLoop]: Abstraction has 117 states and 122 transitions. [2019-11-07 01:22:12,235 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-07 01:22:12,235 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 122 transitions. [2019-11-07 01:22:12,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-11-07 01:22:12,238 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:12,238 INFO L410 BasicCegarLoop]: trace histogram [26, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:12,439 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:12,440 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:12,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:12,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1972973981, now seen corresponding path program 6 times [2019-11-07 01:22:12,441 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:12,441 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239978063] [2019-11-07 01:22:12,441 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:12,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:13,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 864 trivial. 0 not checked. [2019-11-07 01:22:13,248 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239978063] [2019-11-07 01:22:13,248 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204751970] [2019-11-07 01:22:13,248 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 01:22:13,413 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:22:13,413 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:13,416 INFO L256 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-07 01:22:13,432 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:14,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2019-11-07 01:22:14,111 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:15,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2019-11-07 01:22:15,176 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199625962] [2019-11-07 01:22:15,178 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:22:15,178 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:15,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:15,179 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:15,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:15,194 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:16,001 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:16,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:16,007 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:16,432 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:16,432 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 29, 29, 11] total 85 [2019-11-07 01:22:16,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246863113] [2019-11-07 01:22:16,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 85 states [2019-11-07 01:22:16,434 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:16,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2019-11-07 01:22:16,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1778, Invalid=5362, Unknown=0, NotChecked=0, Total=7140 [2019-11-07 01:22:16,438 INFO L87 Difference]: Start difference. First operand 117 states and 122 transitions. Second operand 85 states. [2019-11-07 01:22:21,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:21,524 INFO L93 Difference]: Finished difference Result 243 states and 284 transitions. [2019-11-07 01:22:21,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-11-07 01:22:21,524 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 113 [2019-11-07 01:22:21,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:21,526 INFO L225 Difference]: With dead ends: 243 [2019-11-07 01:22:21,527 INFO L226 Difference]: Without dead ends: 158 [2019-11-07 01:22:21,535 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6399 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5366, Invalid=21694, Unknown=0, NotChecked=0, Total=27060 [2019-11-07 01:22:21,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-11-07 01:22:21,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 149. [2019-11-07 01:22:21,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-11-07 01:22:21,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 154 transitions. [2019-11-07 01:22:21,555 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 154 transitions. Word has length 113 [2019-11-07 01:22:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:21,555 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 154 transitions. [2019-11-07 01:22:21,555 INFO L463 AbstractCegarLoop]: Interpolant automaton has 85 states. [2019-11-07 01:22:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 154 transitions. [2019-11-07 01:22:21,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-11-07 01:22:21,558 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:21,558 INFO L410 BasicCegarLoop]: trace histogram [54, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:21,761 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:21,762 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:21,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:21,763 INFO L82 PathProgramCache]: Analyzing trace with hash -95848259, now seen corresponding path program 7 times [2019-11-07 01:22:21,763 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:21,763 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109425775] [2019-11-07 01:22:21,764 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:22,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:22,531 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 2055 trivial. 0 not checked. [2019-11-07 01:22:22,532 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109425775] [2019-11-07 01:22:22,532 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995404280] [2019-11-07 01:22:22,532 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:22,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:22,766 INFO L256 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 56 conjunts are in the unsatisfiable core [2019-11-07 01:22:22,771 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:24,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2019-11-07 01:22:24,464 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:28,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2019-11-07 01:22:28,947 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512492304] [2019-11-07 01:22:28,953 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:22:28,954 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:28,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:28,954 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:28,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:28,980 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:29,864 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:29,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:29,869 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:30,454 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:30,454 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 57, 57, 11] total 142 [2019-11-07 01:22:30,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460591400] [2019-11-07 01:22:30,456 INFO L442 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-11-07 01:22:30,456 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:30,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-11-07 01:22:30,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6475, Invalid=13547, Unknown=0, NotChecked=0, Total=20022 [2019-11-07 01:22:30,461 INFO L87 Difference]: Start difference. First operand 149 states and 154 transitions. Second operand 142 states.