/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_copy9_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:22:35,345 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:22:35,395 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:22:35,396 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:22:35,398 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:22:35,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:22:35,401 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:22:35,402 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:22:35,404 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:22:35,408 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:22:35,412 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:22:35,415 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:22:35,419 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:22:35,420 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:22:35,422 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:22:35,433 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:22:35,434 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:22:35,434 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:22:35,435 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 01:22:35,454 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:22:35,454 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:22:35,455 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:22:35,456 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:22:35,456 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:22:35,456 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:22:35,456 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:22:35,456 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:22:35,457 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:22:35,457 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:22:35,457 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:22:35,457 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:22:35,457 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:22:35,458 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:22:35,458 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:22:35,458 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:22:35,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:22:35,458 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:22:35,459 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:22:35,459 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:22:35,459 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:22:35,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:22:35,459 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:22:35,460 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:22:35,460 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:22:35,460 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:22:35,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:22:35,461 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:22:35,461 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 01:22:35,730 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:22:35,744 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:22:35,747 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:22:35,749 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:22:35,749 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:22:35,750 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy9_ground-1.i [2019-11-07 01:22:35,830 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2aa33930b/f3675ad77b7c496587f47025b98c57e8/FLAG050898855 [2019-11-07 01:22:36,295 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:22:36,296 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy9_ground-1.i [2019-11-07 01:22:36,306 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2aa33930b/f3675ad77b7c496587f47025b98c57e8/FLAG050898855 [2019-11-07 01:22:36,702 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2aa33930b/f3675ad77b7c496587f47025b98c57e8 [2019-11-07 01:22:36,727 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:22:36,733 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:22:36,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:22:36,738 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:22:36,746 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:22:36,748 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:22:36" (1/1) ... [2019-11-07 01:22:36,758 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12c1dcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:36, skipping insertion in model container [2019-11-07 01:22:36,758 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:22:36" (1/1) ... [2019-11-07 01:22:36,777 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:22:36,832 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:22:37,157 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:22:37,161 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:22:37,189 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:22:37,289 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:22:37,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37 WrapperNode [2019-11-07 01:22:37,290 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:22:37,291 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:22:37,291 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:22:37,291 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:22:37,301 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,301 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,320 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,320 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,335 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,346 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,348 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (1/1) ... [2019-11-07 01:22:37,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:22:37,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:22:37,358 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:22:37,359 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:22:37,360 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (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 01:22:37,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:22:37,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:22:37,413 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:22:37,413 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:22:37,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:22:37,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:22:37,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:22:37,414 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:22:37,414 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:22:37,414 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:22:37,415 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:22:37,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:22:37,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:22:37,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:22:38,043 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:22:38,044 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-07 01:22:38,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:22:38 BoogieIcfgContainer [2019-11-07 01:22:38,045 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:22:38,047 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:22:38,047 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:22:38,050 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:22:38,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:22:36" (1/3) ... [2019-11-07 01:22:38,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5857b7b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:22:38, skipping insertion in model container [2019-11-07 01:22:38,052 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:37" (2/3) ... [2019-11-07 01:22:38,053 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5857b7b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:22:38, skipping insertion in model container [2019-11-07 01:22:38,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:22:38" (3/3) ... [2019-11-07 01:22:38,055 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy9_ground-1.i [2019-11-07 01:22:38,065 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:22:38,075 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:22:38,087 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:22:38,114 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:22:38,114 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:22:38,114 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:22:38,114 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:22:38,115 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:22:38,115 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:22:38,115 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:22:38,115 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:22:38,135 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-07 01:22:38,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:22:38,142 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:38,143 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 01:22:38,146 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:38,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:38,151 INFO L82 PathProgramCache]: Analyzing trace with hash 943724403, now seen corresponding path program 1 times [2019-11-07 01:22:38,161 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:38,162 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120368307] [2019-11-07 01:22:38,162 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:38,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:38,380 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 01:22:38,381 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120368307] [2019-11-07 01:22:38,383 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:22:38,383 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:22:38,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31159702] [2019-11-07 01:22:38,391 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:22:38,392 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:38,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:22:38,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:22:38,412 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-07 01:22:38,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:38,464 INFO L93 Difference]: Finished difference Result 49 states and 72 transitions. [2019-11-07 01:22:38,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:22:38,466 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-07 01:22:38,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:38,477 INFO L225 Difference]: With dead ends: 49 [2019-11-07 01:22:38,478 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:22:38,485 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 01:22:38,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:22:38,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:22:38,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:22:38,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 35 transitions. [2019-11-07 01:22:38,550 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 35 transitions. Word has length 20 [2019-11-07 01:22:38,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:38,552 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 35 transitions. [2019-11-07 01:22:38,552 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:22:38,553 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 35 transitions. [2019-11-07 01:22:38,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 01:22:38,555 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:38,556 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 01:22:38,556 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:38,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:38,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1563711792, now seen corresponding path program 1 times [2019-11-07 01:22:38,557 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:38,557 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003284137] [2019-11-07 01:22:38,558 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:38,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:38,673 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 01:22:38,674 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003284137] [2019-11-07 01:22:38,674 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:22:38,674 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:22:38,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547790016] [2019-11-07 01:22:38,679 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:22:38,679 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:38,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:22:38,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:22:38,681 INFO L87 Difference]: Start difference. First operand 25 states and 35 transitions. Second operand 3 states. [2019-11-07 01:22:38,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:38,776 INFO L93 Difference]: Finished difference Result 51 states and 78 transitions. [2019-11-07 01:22:38,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:22:38,778 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2019-11-07 01:22:38,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:38,779 INFO L225 Difference]: With dead ends: 51 [2019-11-07 01:22:38,780 INFO L226 Difference]: Without dead ends: 34 [2019-11-07 01:22:38,781 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 01:22:38,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-07 01:22:38,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-07 01:22:38,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 01:22:38,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2019-11-07 01:22:38,796 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 21 [2019-11-07 01:22:38,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:38,796 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2019-11-07 01:22:38,796 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:22:38,796 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2019-11-07 01:22:38,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:22:38,798 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:38,798 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] [2019-11-07 01:22:38,798 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:38,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:38,799 INFO L82 PathProgramCache]: Analyzing trace with hash -168556700, now seen corresponding path program 1 times [2019-11-07 01:22:38,799 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:38,799 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632567736] [2019-11-07 01:22:38,800 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:38,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:38,961 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:22:38,962 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632567736] [2019-11-07 01:22:38,962 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881368774] [2019-11-07 01:22:38,962 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 01:22:39,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:39,089 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:22:39,096 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:39,127 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:22:39,128 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:39,161 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:22:39,162 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [870966481] [2019-11-07 01:22:39,212 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 01:22:39,213 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:39,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:39,227 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:39,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:39,369 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:39,859 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:22:40,313 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:22:41,580 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:41,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:41,587 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:41,848 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:41,849 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-11-07 01:22:41,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550906159] [2019-11-07 01:22:41,850 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:22:41,856 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:41,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:22:41,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:22:41,857 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand 17 states. [2019-11-07 01:22:42,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:42,489 INFO L93 Difference]: Finished difference Result 73 states and 95 transitions. [2019-11-07 01:22:42,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-07 01:22:42,490 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2019-11-07 01:22:42,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:42,491 INFO L225 Difference]: With dead ends: 73 [2019-11-07 01:22:42,491 INFO L226 Difference]: Without dead ends: 46 [2019-11-07 01:22:42,495 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=623, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:22:42,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-07 01:22:42,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 37. [2019-11-07 01:22:42,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 01:22:42,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2019-11-07 01:22:42,505 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 30 [2019-11-07 01:22:42,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:42,505 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2019-11-07 01:22:42,506 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:22:42,506 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2019-11-07 01:22:42,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 01:22:42,507 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:42,507 INFO L410 BasicCegarLoop]: trace histogram [4, 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 01:22:42,711 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:42,712 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:42,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:42,712 INFO L82 PathProgramCache]: Analyzing trace with hash -299252415, now seen corresponding path program 2 times [2019-11-07 01:22:42,713 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:42,713 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995590300] [2019-11-07 01:22:42,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:42,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:42,792 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:22:42,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995590300] [2019-11-07 01:22:42,793 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951955277] [2019-11-07 01:22:42,793 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 01:22:42,877 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:22:42,877 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:42,879 INFO L256 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:22:42,881 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:42,901 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:22:42,902 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:42,925 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:22:42,925 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818788395] [2019-11-07 01:22:42,927 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 01:22:42,927 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:42,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:42,928 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:42,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:42,953 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:43,435 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:22:43,739 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:22:44,940 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:44,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:44,949 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:45,164 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:45,164 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-11-07 01:22:45,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154424185] [2019-11-07 01:22:45,165 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:22:45,166 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:45,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:22:45,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:22:45,167 INFO L87 Difference]: Start difference. First operand 37 states and 47 transitions. Second operand 17 states. [2019-11-07 01:22:45,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:45,913 INFO L93 Difference]: Finished difference Result 98 states and 143 transitions. [2019-11-07 01:22:45,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-07 01:22:45,915 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 33 [2019-11-07 01:22:45,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:45,917 INFO L225 Difference]: With dead ends: 98 [2019-11-07 01:22:45,918 INFO L226 Difference]: Without dead ends: 73 [2019-11-07 01:22:45,919 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=615, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:22:45,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-07 01:22:45,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 64. [2019-11-07 01:22:45,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-07 01:22:45,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2019-11-07 01:22:45,946 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 33 [2019-11-07 01:22:45,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:45,953 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2019-11-07 01:22:45,953 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:22:45,953 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2019-11-07 01:22:45,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-07 01:22:45,955 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:45,956 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:46,164 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:46,165 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:46,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:46,165 INFO L82 PathProgramCache]: Analyzing trace with hash -728873293, now seen corresponding path program 3 times [2019-11-07 01:22:46,166 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:46,166 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476462174] [2019-11-07 01:22:46,166 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:46,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:46,399 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-11-07 01:22:46,399 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476462174] [2019-11-07 01:22:46,399 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070119546] [2019-11-07 01:22:46,400 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 01:22:46,512 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:22:46,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:46,514 INFO L256 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:22:46,518 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:46,573 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-11-07 01:22:46,573 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:46,642 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-11-07 01:22:46,642 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19195446] [2019-11-07 01:22:46,644 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 01:22:46,644 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:46,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:46,645 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:46,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:46,666 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:48,436 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:48,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:48,442 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:48,702 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:48,702 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 11] total 27 [2019-11-07 01:22:48,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130931257] [2019-11-07 01:22:48,704 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 01:22:48,704 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:48,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 01:22:48,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:22:48,706 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand 27 states. [2019-11-07 01:22:50,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:50,019 INFO L93 Difference]: Finished difference Result 142 states and 176 transitions. [2019-11-07 01:22:50,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 01:22:50,024 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 60 [2019-11-07 01:22:50,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:50,026 INFO L225 Difference]: With dead ends: 142 [2019-11-07 01:22:50,026 INFO L226 Difference]: Without dead ends: 88 [2019-11-07 01:22:50,028 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=349, Invalid=2003, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 01:22:50,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-11-07 01:22:50,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 79. [2019-11-07 01:22:50,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-07 01:22:50,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2019-11-07 01:22:50,040 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 60 [2019-11-07 01:22:50,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:50,041 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2019-11-07 01:22:50,041 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 01:22:50,041 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2019-11-07 01:22:50,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-07 01:22:50,042 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:50,043 INFO L410 BasicCegarLoop]: trace histogram [10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:50,246 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:50,246 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:50,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:50,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1290344095, now seen corresponding path program 4 times [2019-11-07 01:22:50,247 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:50,247 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611770948] [2019-11-07 01:22:50,248 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:50,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:50,541 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-11-07 01:22:50,541 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611770948] [2019-11-07 01:22:50,541 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518992488] [2019-11-07 01:22:50,542 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 01:22:50,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:50,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 01:22:50,686 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:50,706 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-11-07 01:22:50,707 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:50,923 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-11-07 01:22:50,923 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [373920862] [2019-11-07 01:22:50,926 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 01:22:50,926 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:50,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:50,927 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:50,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:50,945 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:52,603 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:22:52,661 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:52,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:52,671 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:52,911 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:52,911 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 35 [2019-11-07 01:22:52,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268172197] [2019-11-07 01:22:52,913 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 01:22:52,913 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:52,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 01:22:52,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:22:52,915 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand 35 states. [2019-11-07 01:22:54,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:54,193 INFO L93 Difference]: Finished difference Result 163 states and 194 transitions. [2019-11-07 01:22:54,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-07 01:22:54,194 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 75 [2019-11-07 01:22:54,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:54,196 INFO L225 Difference]: With dead ends: 163 [2019-11-07 01:22:54,197 INFO L226 Difference]: Without dead ends: 100 [2019-11-07 01:22:54,199 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=934, Invalid=3098, Unknown=0, NotChecked=0, Total=4032 [2019-11-07 01:22:54,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-11-07 01:22:54,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 91. [2019-11-07 01:22:54,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-07 01:22:54,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2019-11-07 01:22:54,212 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 75 [2019-11-07 01:22:54,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:54,212 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2019-11-07 01:22:54,212 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 01:22:54,212 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2019-11-07 01:22:54,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-07 01:22:54,214 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:54,214 INFO L410 BasicCegarLoop]: trace histogram [22, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:54,418 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:54,418 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:54,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:54,419 INFO L82 PathProgramCache]: Analyzing trace with hash -2108998751, now seen corresponding path program 5 times [2019-11-07 01:22:54,419 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:54,419 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549185452] [2019-11-07 01:22:54,420 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:54,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:54,826 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-11-07 01:22:54,827 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549185452] [2019-11-07 01:22:54,827 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396196937] [2019-11-07 01:22:54,827 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 01:22:58,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 01:22:58,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:58,969 INFO L256 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 45 conjunts are in the unsatisfiable core [2019-11-07 01:22:58,973 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:59,198 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 37 proven. 15 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2019-11-07 01:22:59,202 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:59,366 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2019-11-07 01:22:59,367 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1596610019] [2019-11-07 01:22:59,368 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 01:22:59,369 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:59,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:59,369 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:59,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:59,388 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:00,230 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:23:00,855 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:23:01,256 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:23:01,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:01,264 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:01,636 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:01,636 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 10, 8, 11] total 49 [2019-11-07 01:23:01,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775888308] [2019-11-07 01:23:01,638 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-11-07 01:23:01,639 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:01,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-11-07 01:23:01,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=1894, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 01:23:01,641 INFO L87 Difference]: Start difference. First operand 91 states and 101 transitions. Second operand 49 states. [2019-11-07 01:23:04,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:04,797 INFO L93 Difference]: Finished difference Result 227 states and 310 transitions. [2019-11-07 01:23:04,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-11-07 01:23:04,798 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 87 [2019-11-07 01:23:04,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:04,800 INFO L225 Difference]: With dead ends: 227 [2019-11-07 01:23:04,800 INFO L226 Difference]: Without dead ends: 164 [2019-11-07 01:23:04,803 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2180 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1433, Invalid=7123, Unknown=0, NotChecked=0, Total=8556 [2019-11-07 01:23:04,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-11-07 01:23:04,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 155. [2019-11-07 01:23:04,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2019-11-07 01:23:04,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 165 transitions. [2019-11-07 01:23:04,822 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 165 transitions. Word has length 87 [2019-11-07 01:23:04,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:04,823 INFO L462 AbstractCegarLoop]: Abstraction has 155 states and 165 transitions. [2019-11-07 01:23:04,823 INFO L463 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-11-07 01:23:04,823 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 165 transitions. [2019-11-07 01:23:04,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2019-11-07 01:23:04,826 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:04,826 INFO L410 BasicCegarLoop]: trace histogram [23, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:05,028 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:05,029 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:05,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:05,030 INFO L82 PathProgramCache]: Analyzing trace with hash 803430864, now seen corresponding path program 6 times [2019-11-07 01:23:05,030 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:05,030 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078124271] [2019-11-07 01:23:05,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:05,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:05,675 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2019-11-07 01:23:05,675 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078124271] [2019-11-07 01:23:05,675 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752920498] [2019-11-07 01:23:05,675 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 01:23:05,892 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:23:05,893 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:05,897 INFO L256 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-07 01:23:05,901 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2019-11-07 01:23:05,940 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:06,694 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2019-11-07 01:23:06,695 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [435601364] [2019-11-07 01:23:06,697 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 01:23:06,697 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:06,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:06,697 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:06,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:06,715 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:10,959 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:23:12,490 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:23:12,494 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:12,496 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:13,024 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:13,024 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 11] total 61 [2019-11-07 01:23:13,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277631143] [2019-11-07 01:23:13,025 INFO L442 AbstractCegarLoop]: Interpolant automaton has 61 states [2019-11-07 01:23:13,026 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:13,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2019-11-07 01:23:13,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1304, Invalid=2356, Unknown=0, NotChecked=0, Total=3660 [2019-11-07 01:23:13,028 INFO L87 Difference]: Start difference. First operand 155 states and 165 transitions. Second operand 61 states. [2019-11-07 01:23:16,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:16,151 INFO L93 Difference]: Finished difference Result 315 states and 359 transitions. [2019-11-07 01:23:16,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-11-07 01:23:16,151 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 151 [2019-11-07 01:23:16,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:16,153 INFO L225 Difference]: With dead ends: 315 [2019-11-07 01:23:16,153 INFO L226 Difference]: Without dead ends: 189 [2019-11-07 01:23:16,158 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2979 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3807, Invalid=9533, Unknown=0, NotChecked=0, Total=13340 [2019-11-07 01:23:16,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2019-11-07 01:23:16,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 180. [2019-11-07 01:23:16,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-11-07 01:23:16,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 190 transitions. [2019-11-07 01:23:16,179 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 190 transitions. Word has length 151 [2019-11-07 01:23:16,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:16,180 INFO L462 AbstractCegarLoop]: Abstraction has 180 states and 190 transitions. [2019-11-07 01:23:16,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 61 states. [2019-11-07 01:23:16,180 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 190 transitions. [2019-11-07 01:23:16,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2019-11-07 01:23:16,183 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:16,183 INFO L410 BasicCegarLoop]: trace histogram [48, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]