java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-crafted/zero_sum_m4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:31:12,234 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:31:12,236 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:31:12,248 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:31:12,248 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:31:12,249 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:31:12,251 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:31:12,252 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:31:12,254 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:31:12,255 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:31:12,256 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:31:12,257 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:31:12,257 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:31:12,258 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:31:12,259 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:31:12,260 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:31:12,261 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:31:12,261 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:31:12,263 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:31:12,265 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:31:12,266 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:31:12,267 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:31:12,268 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:31:12,269 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:31:12,271 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:31:12,279 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:31:12,280 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:31:12,280 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:31:12,281 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 [2019-10-15 01:31:12,295 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:31:12,295 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:31:12,297 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:31:12,297 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:31:12,297 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:31:12,297 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:31:12,297 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:31:12,298 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:31:12,298 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:31:12,298 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:31:12,298 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:31:12,298 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:31:12,298 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:31:12,299 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:31:12,299 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:31:12,299 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:31:12,299 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:31:12,300 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:31:12,300 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:31:12,300 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:31:12,300 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:31:12,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:31:12,301 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:31:12,301 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:31:12,301 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:31:12,301 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:31:12,301 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:31:12,301 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:31:12,302 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 [2019-10-15 01:31:12,594 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:31:12,614 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:31:12,617 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:31:12,618 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:31:12,619 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:31:12,619 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_m4.c [2019-10-15 01:31:12,700 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80489a5d/699dc7b96db74961a7e114b215209e4e/FLAG2633e0073 [2019-10-15 01:31:13,139 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:31:13,140 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_m4.c [2019-10-15 01:31:13,146 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80489a5d/699dc7b96db74961a7e114b215209e4e/FLAG2633e0073 [2019-10-15 01:31:13,526 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80489a5d/699dc7b96db74961a7e114b215209e4e [2019-10-15 01:31:13,536 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:31:13,537 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:31:13,539 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:13,539 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:31:13,542 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:31:13,543 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,546 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ba71078 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13, skipping insertion in model container [2019-10-15 01:31:13,546 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,554 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:31:13,572 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:31:13,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:13,747 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:31:13,773 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:13,874 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:31:13,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13 WrapperNode [2019-10-15 01:31:13,875 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:13,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:31:13,876 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:31:13,876 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:31:13,893 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,901 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,901 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,910 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,918 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,920 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (1/1) ... [2019-10-15 01:31:13,922 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:31:13,923 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:31:13,923 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:31:13,923 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:31:13,924 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (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 [2019-10-15 01:31:13,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:31:13,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:31:13,982 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:31:13,982 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:31:13,983 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:31:13,983 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:31:13,983 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:31:13,983 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2019-10-15 01:31:13,983 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:31:13,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:31:13,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:31:13,984 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:31:13,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:31:13,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:31:13,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:31:14,466 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:31:14,466 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-10-15 01:31:14,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:14 BoogieIcfgContainer [2019-10-15 01:31:14,468 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:31:14,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:31:14,469 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:31:14,472 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:31:14,472 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:31:13" (1/3) ... [2019-10-15 01:31:14,473 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@776126d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:14, skipping insertion in model container [2019-10-15 01:31:14,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:13" (2/3) ... [2019-10-15 01:31:14,473 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@776126d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:14, skipping insertion in model container [2019-10-15 01:31:14,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:14" (3/3) ... [2019-10-15 01:31:14,476 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_m4.c [2019-10-15 01:31:14,487 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:31:14,496 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:31:14,508 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:31:14,540 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:31:14,540 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:31:14,540 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:31:14,540 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:31:14,540 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:31:14,541 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:31:14,541 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:31:14,541 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:31:14,555 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-15 01:31:14,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-15 01:31:14,561 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:14,562 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:14,563 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:14,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:14,567 INFO L82 PathProgramCache]: Analyzing trace with hash 936704280, now seen corresponding path program 1 times [2019-10-15 01:31:14,574 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:14,574 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577742563] [2019-10-15 01:31:14,575 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:14,575 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:14,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:14,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:14,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:14,792 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577742563] [2019-10-15 01:31:14,793 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:14,793 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:31:14,793 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286748796] [2019-10-15 01:31:14,798 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:31:14,798 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:14,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:31:14,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:31:14,816 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2019-10-15 01:31:14,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:14,918 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2019-10-15 01:31:14,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:31:14,920 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2019-10-15 01:31:14,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:14,930 INFO L225 Difference]: With dead ends: 52 [2019-10-15 01:31:14,930 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 01:31:14,934 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:31:14,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 01:31:14,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-15 01:31:14,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:31:14,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 43 transitions. [2019-10-15 01:31:14,976 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 43 transitions. Word has length 19 [2019-10-15 01:31:14,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:14,977 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 43 transitions. [2019-10-15 01:31:14,977 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:31:14,977 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 43 transitions. [2019-10-15 01:31:14,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:31:14,978 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:14,978 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:14,979 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:14,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:14,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1654172677, now seen corresponding path program 1 times [2019-10-15 01:31:14,980 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:14,980 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427431471] [2019-10-15 01:31:14,980 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:14,980 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:14,981 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:15,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:15,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:15,078 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427431471] [2019-10-15 01:31:15,078 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:15,078 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:31:15,079 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36889957] [2019-10-15 01:31:15,082 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:31:15,083 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:15,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:31:15,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:15,084 INFO L87 Difference]: Start difference. First operand 28 states and 43 transitions. Second operand 3 states. [2019-10-15 01:31:15,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:15,145 INFO L93 Difference]: Finished difference Result 50 states and 80 transitions. [2019-10-15 01:31:15,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:31:15,147 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-10-15 01:31:15,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:15,148 INFO L225 Difference]: With dead ends: 50 [2019-10-15 01:31:15,148 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:31:15,150 INFO L600 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 [2019-10-15 01:31:15,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:31:15,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:31:15,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:31:15,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 44 transitions. [2019-10-15 01:31:15,158 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 44 transitions. Word has length 20 [2019-10-15 01:31:15,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:15,158 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 44 transitions. [2019-10-15 01:31:15,159 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:31:15,159 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 44 transitions. [2019-10-15 01:31:15,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:31:15,160 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:15,160 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:15,160 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:15,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:15,161 INFO L82 PathProgramCache]: Analyzing trace with hash 2052158869, now seen corresponding path program 1 times [2019-10-15 01:31:15,161 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:15,162 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758650678] [2019-10-15 01:31:15,162 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:15,162 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:15,162 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:15,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:15,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:31:15,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758650678] [2019-10-15 01:31:15,237 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:15,237 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:31:15,238 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335676832] [2019-10-15 01:31:15,238 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:31:15,238 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:15,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:31:15,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:15,241 INFO L87 Difference]: Start difference. First operand 29 states and 44 transitions. Second operand 4 states. [2019-10-15 01:31:15,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:15,335 INFO L93 Difference]: Finished difference Result 48 states and 76 transitions. [2019-10-15 01:31:15,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:31:15,335 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2019-10-15 01:31:15,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:15,336 INFO L225 Difference]: With dead ends: 48 [2019-10-15 01:31:15,337 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:31:15,337 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:15,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:31:15,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:31:15,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:31:15,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2019-10-15 01:31:15,353 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 21 [2019-10-15 01:31:15,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:15,354 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2019-10-15 01:31:15,354 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:31:15,354 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2019-10-15 01:31:15,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:31:15,355 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:15,355 INFO L380 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] [2019-10-15 01:31:15,356 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:15,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:15,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1641054906, now seen corresponding path program 1 times [2019-10-15 01:31:15,358 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:15,358 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903229100] [2019-10-15 01:31:15,358 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:15,358 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:15,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:15,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:15,480 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:31:15,480 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903229100] [2019-10-15 01:31:15,480 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682270607] [2019-10-15 01:31:15,481 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 [2019-10-15 01:31:15,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:15,551 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:15,557 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:15,605 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:31:15,606 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:15,640 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:31:15,641 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1132389595] [2019-10-15 01:31:15,665 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:15,666 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:15,672 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:15,679 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:15,680 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:15,844 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:31:16,378 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:16,395 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:16,401 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:16,776 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:16,776 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-10-15 01:31:16,776 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815439518] [2019-10-15 01:31:16,778 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-15 01:31:16,778 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:16,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-15 01:31:16,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-10-15 01:31:16,779 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 17 states. [2019-10-15 01:31:17,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:17,156 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2019-10-15 01:31:17,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 01:31:17,157 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2019-10-15 01:31:17,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:17,158 INFO L225 Difference]: With dead ends: 51 [2019-10-15 01:31:17,158 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 01:31:17,159 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2019-10-15 01:31:17,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 01:31:17,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-10-15 01:31:17,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 01:31:17,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2019-10-15 01:31:17,171 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 28 [2019-10-15 01:31:17,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:17,171 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2019-10-15 01:31:17,171 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-15 01:31:17,172 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2019-10-15 01:31:17,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:31:17,173 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:17,173 INFO L380 BasicCegarLoop]: trace histogram [2, 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] [2019-10-15 01:31:17,378 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:17,379 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:17,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:17,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1664007242, now seen corresponding path program 2 times [2019-10-15 01:31:17,380 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:17,380 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460229621] [2019-10-15 01:31:17,380 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:17,381 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:17,381 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:17,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:17,490 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:17,491 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460229621] [2019-10-15 01:31:17,491 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136381025] [2019-10-15 01:31:17,491 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 [2019-10-15 01:31:17,562 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:31:17,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:17,564 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:17,570 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:17,625 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:17,626 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:17,665 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:17,666 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932568615] [2019-10-15 01:31:17,669 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:17,671 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:17,672 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:17,672 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:17,673 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:17,732 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:31:18,174 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:18,187 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:18,192 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:18,497 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:18,497 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 18 [2019-10-15 01:31:18,497 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081761226] [2019-10-15 01:31:18,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:31:18,498 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:18,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:31:18,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:31:18,499 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 18 states. [2019-10-15 01:31:18,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:18,892 INFO L93 Difference]: Finished difference Result 57 states and 79 transitions. [2019-10-15 01:31:18,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 01:31:18,893 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 29 [2019-10-15 01:31:18,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:18,894 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:31:18,894 INFO L226 Difference]: Without dead ends: 38 [2019-10-15 01:31:18,895 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:31:18,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-15 01:31:18,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-10-15 01:31:18,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-15 01:31:18,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2019-10-15 01:31:18,901 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 29 [2019-10-15 01:31:18,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:18,902 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2019-10-15 01:31:18,902 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:31:18,902 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2019-10-15 01:31:18,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:31:18,903 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:18,903 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:19,107 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:19,108 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:19,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:19,108 INFO L82 PathProgramCache]: Analyzing trace with hash 939463896, now seen corresponding path program 3 times [2019-10-15 01:31:19,108 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:19,109 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976631670] [2019-10-15 01:31:19,109 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:19,109 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:19,109 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:19,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:20,415 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:20,416 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976631670] [2019-10-15 01:31:20,416 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913824083] [2019-10-15 01:31:20,417 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:20,496 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:20,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:20,498 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 74 conjunts are in the unsatisfiable core [2019-10-15 01:31:20,501 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:21,117 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:21,117 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:22,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1188814058] [2019-10-15 01:31:22,315 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:22,316 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:22,316 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:22,316 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:22,317 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:22,351 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:31:22,628 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:22,654 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:22,659 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:23,497 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:23,498 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 25, 11] total 65 [2019-10-15 01:31:23,498 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382519161] [2019-10-15 01:31:23,500 INFO L442 AbstractCegarLoop]: Interpolant automaton has 65 states [2019-10-15 01:31:23,500 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:23,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2019-10-15 01:31:23,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=3956, Unknown=0, NotChecked=0, Total=4160 [2019-10-15 01:31:23,503 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 65 states. [2019-10-15 01:31:25,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:25,877 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2019-10-15 01:31:25,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-15 01:31:25,878 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 37 [2019-10-15 01:31:25,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:25,880 INFO L225 Difference]: With dead ends: 65 [2019-10-15 01:31:25,880 INFO L226 Difference]: Without dead ends: 60 [2019-10-15 01:31:25,884 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 65 SyntacticMatches, 13 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1492 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=285, Invalid=5567, Unknown=0, NotChecked=0, Total=5852 [2019-10-15 01:31:25,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-15 01:31:25,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-10-15 01:31:25,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-15 01:31:25,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2019-10-15 01:31:25,892 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 37 [2019-10-15 01:31:25,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:25,892 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2019-10-15 01:31:25,892 INFO L463 AbstractCegarLoop]: Interpolant automaton has 65 states. [2019-10-15 01:31:25,893 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2019-10-15 01:31:25,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-15 01:31:25,894 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:25,894 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:26,103 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:26,104 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:26,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:26,105 INFO L82 PathProgramCache]: Analyzing trace with hash -944115259, now seen corresponding path program 4 times [2019-10-15 01:31:26,106 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:26,106 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514057986] [2019-10-15 01:31:26,106 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:26,107 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:26,107 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:26,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:26,212 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:31:26,213 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514057986] [2019-10-15 01:31:26,213 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549382315] [2019-10-15 01:31:26,213 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 [2019-10-15 01:31:26,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:26,314 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:26,320 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:26,356 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:31:26,357 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:26,383 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:31:26,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1221087956] [2019-10-15 01:31:26,386 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:26,386 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:26,386 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:26,387 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:26,387 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:26,433 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:31:26,656 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:26,666 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:26,671 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:27,010 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:27,010 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 23 [2019-10-15 01:31:27,010 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003131829] [2019-10-15 01:31:27,011 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-15 01:31:27,012 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:27,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-15 01:31:27,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2019-10-15 01:31:27,012 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand 23 states. [2019-10-15 01:31:27,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:27,542 INFO L93 Difference]: Finished difference Result 110 states and 140 transitions. [2019-10-15 01:31:27,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:31:27,542 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 38 [2019-10-15 01:31:27,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:27,544 INFO L225 Difference]: With dead ends: 110 [2019-10-15 01:31:27,544 INFO L226 Difference]: Without dead ends: 59 [2019-10-15 01:31:27,546 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 96 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:31:27,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-15 01:31:27,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-10-15 01:31:27,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-15 01:31:27,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2019-10-15 01:31:27,554 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 38 [2019-10-15 01:31:27,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:27,555 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2019-10-15 01:31:27,555 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-15 01:31:27,555 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2019-10-15 01:31:27,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-15 01:31:27,556 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:27,556 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:27,760 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:27,761 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:27,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:27,761 INFO L82 PathProgramCache]: Analyzing trace with hash -670468267, now seen corresponding path program 5 times [2019-10-15 01:31:27,762 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:27,762 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835573148] [2019-10-15 01:31:27,763 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:27,763 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:27,764 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:27,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:27,834 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:31:27,835 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835573148] [2019-10-15 01:31:27,835 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783887114] [2019-10-15 01:31:27,835 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 [2019-10-15 01:31:27,939 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:31:27,939 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:27,940 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:27,942 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:27,982 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:31:27,983 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:28,050 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:31:28,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1922862241] [2019-10-15 01:31:28,053 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:28,053 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:28,053 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:28,053 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:28,054 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:28,074 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:31:28,277 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:28,289 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:28,293 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:28,636 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:28,637 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 24 [2019-10-15 01:31:28,637 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916373856] [2019-10-15 01:31:28,638 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:31:28,638 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:28,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:31:28,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:31:28,639 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand 24 states. [2019-10-15 01:31:29,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:29,217 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2019-10-15 01:31:29,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-15 01:31:29,218 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 39 [2019-10-15 01:31:29,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:29,219 INFO L225 Difference]: With dead ends: 90 [2019-10-15 01:31:29,219 INFO L226 Difference]: Without dead ends: 47 [2019-10-15 01:31:29,220 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 97 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=175, Invalid=947, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:31:29,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-15 01:31:29,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-10-15 01:31:29,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-15 01:31:29,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2019-10-15 01:31:29,226 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 39 [2019-10-15 01:31:29,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:29,227 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2019-10-15 01:31:29,227 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:31:29,227 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2019-10-15 01:31:29,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-15 01:31:29,228 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:29,228 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:29,432 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:29,432 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:29,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:29,433 INFO L82 PathProgramCache]: Analyzing trace with hash 546226426, now seen corresponding path program 6 times [2019-10-15 01:31:29,433 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:29,433 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038931506] [2019-10-15 01:31:29,433 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:29,434 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:29,434 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:29,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:30,242 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 35 [2019-10-15 01:31:30,398 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 35 [2019-10-15 01:31:30,541 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 32 [2019-10-15 01:31:30,677 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 29 [2019-10-15 01:31:30,881 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 43 [2019-10-15 01:31:31,052 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 38 [2019-10-15 01:31:31,213 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 35 [2019-10-15 01:31:31,360 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 32 [2019-10-15 01:31:31,525 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 44 [2019-10-15 01:31:31,669 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 37 [2019-10-15 01:31:31,818 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 35 [2019-10-15 01:31:31,971 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 32 [2019-10-15 01:31:32,164 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 42 [2019-10-15 01:31:32,334 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 41 [2019-10-15 01:31:32,768 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 41 [2019-10-15 01:31:34,157 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:34,158 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038931506] [2019-10-15 01:31:34,158 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715256303] [2019-10-15 01:31:34,158 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 [2019-10-15 01:31:34,278 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:34,278 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:34,280 WARN L254 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 106 conjunts are in the unsatisfiable core [2019-10-15 01:31:34,283 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:35,837 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:35,838 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:38,636 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:38,636 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [464818966] [2019-10-15 01:31:38,638 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:38,638 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:38,638 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:38,639 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:38,639 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:38,661 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:31:38,850 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:38,858 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:38,861 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:39,996 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:39,996 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 33, 11] total 105 [2019-10-15 01:31:39,996 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431036170] [2019-10-15 01:31:39,998 INFO L442 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-10-15 01:31:39,998 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:39,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-10-15 01:31:40,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=10413, Unknown=0, NotChecked=0, Total=10920 [2019-10-15 01:31:40,002 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 105 states. [2019-10-15 01:31:47,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:47,687 INFO L93 Difference]: Finished difference Result 81 states and 96 transitions. [2019-10-15 01:31:47,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-10-15 01:31:47,687 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 46 [2019-10-15 01:31:47,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:47,689 INFO L225 Difference]: With dead ends: 81 [2019-10-15 01:31:47,689 INFO L226 Difference]: Without dead ends: 76 [2019-10-15 01:31:47,695 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5837 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=1030, Invalid=18430, Unknown=0, NotChecked=0, Total=19460 [2019-10-15 01:31:47,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-15 01:31:47,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2019-10-15 01:31:47,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-15 01:31:47,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2019-10-15 01:31:47,704 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 46 [2019-10-15 01:31:47,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:47,704 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2019-10-15 01:31:47,704 INFO L463 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-10-15 01:31:47,704 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2019-10-15 01:31:47,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-15 01:31:47,705 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:47,706 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:47,909 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:47,910 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:47,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:47,910 INFO L82 PathProgramCache]: Analyzing trace with hash 2058829319, now seen corresponding path program 7 times [2019-10-15 01:31:47,911 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:47,911 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992210721] [2019-10-15 01:31:47,912 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:47,912 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:47,912 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:47,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:47,986 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:31:47,987 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992210721] [2019-10-15 01:31:47,987 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13039371] [2019-10-15 01:31:47,987 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 [2019-10-15 01:31:48,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:48,143 INFO L256 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:31:48,155 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:48,219 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:31:48,220 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:48,270 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:31:48,270 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482705621] [2019-10-15 01:31:48,272 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:48,272 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:48,273 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:48,273 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:48,273 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:48,294 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:31:48,551 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:48,566 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:48,570 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:48,961 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:48,961 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 11] total 26 [2019-10-15 01:31:48,962 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802862449] [2019-10-15 01:31:48,963 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 01:31:48,963 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:48,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 01:31:48,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:31:48,964 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 26 states. [2019-10-15 01:31:49,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:49,613 INFO L93 Difference]: Finished difference Result 140 states and 170 transitions. [2019-10-15 01:31:49,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:31:49,614 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 47 [2019-10-15 01:31:49,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:49,616 INFO L225 Difference]: With dead ends: 140 [2019-10-15 01:31:49,616 INFO L226 Difference]: Without dead ends: 74 [2019-10-15 01:31:49,617 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 120 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=955, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:31:49,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-15 01:31:49,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2019-10-15 01:31:49,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-15 01:31:49,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2019-10-15 01:31:49,626 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 47 [2019-10-15 01:31:49,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:49,626 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2019-10-15 01:31:49,626 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 01:31:49,626 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2019-10-15 01:31:49,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-15 01:31:49,627 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:49,627 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:49,832 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:49,833 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:49,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:49,833 INFO L82 PathProgramCache]: Analyzing trace with hash -463668617, now seen corresponding path program 8 times [2019-10-15 01:31:49,834 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:49,835 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80219578] [2019-10-15 01:31:49,835 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:49,835 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:49,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:49,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:49,950 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-15 01:31:49,950 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80219578] [2019-10-15 01:31:49,951 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303984181] [2019-10-15 01:31:49,951 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:50,124 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:31:50,124 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:50,125 INFO L256 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:31:50,127 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:50,200 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-15 01:31:50,200 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:50,254 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-15 01:31:50,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066469672] [2019-10-15 01:31:50,256 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:50,256 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:50,256 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:50,257 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:50,257 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:50,284 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:31:50,497 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:31:50,510 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:31:50,515 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:50,849 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:50,850 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 27 [2019-10-15 01:31:50,850 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901259653] [2019-10-15 01:31:50,851 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-15 01:31:50,851 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:50,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-15 01:31:50,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:31:50,852 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand 27 states. [2019-10-15 01:31:51,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:51,488 INFO L93 Difference]: Finished difference Result 111 states and 139 transitions. [2019-10-15 01:31:51,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-15 01:31:51,488 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 48 [2019-10-15 01:31:51,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:51,489 INFO L225 Difference]: With dead ends: 111 [2019-10-15 01:31:51,489 INFO L226 Difference]: Without dead ends: 56 [2019-10-15 01:31:51,491 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 8 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=224, Invalid=1182, Unknown=0, NotChecked=0, Total=1406 [2019-10-15 01:31:51,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-15 01:31:51,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-10-15 01:31:51,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-15 01:31:51,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2019-10-15 01:31:51,500 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 48 [2019-10-15 01:31:51,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:51,500 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2019-10-15 01:31:51,500 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-15 01:31:51,500 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2019-10-15 01:31:51,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-15 01:31:51,501 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:51,501 INFO L380 BasicCegarLoop]: trace histogram [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] [2019-10-15 01:31:51,707 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:51,707 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:51,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:51,708 INFO L82 PathProgramCache]: Analyzing trace with hash 1490739352, now seen corresponding path program 9 times [2019-10-15 01:31:51,708 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:51,709 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697806636] [2019-10-15 01:31:51,709 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:51,709 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:51,709 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:51,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:52,306 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 12 [2019-10-15 01:31:52,430 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 14 [2019-10-15 01:31:52,619 WARN L191 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 26 [2019-10-15 01:31:52,838 WARN L191 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 34 [2019-10-15 01:31:53,085 WARN L191 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 38 [2019-10-15 01:31:53,300 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 35 [2019-10-15 01:31:53,506 WARN L191 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 37 [2019-10-15 01:31:53,733 WARN L191 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 44 [2019-10-15 01:31:53,950 WARN L191 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 45 [2019-10-15 01:31:54,174 WARN L191 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 45 [2019-10-15 01:31:54,413 WARN L191 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 41 [2019-10-15 01:31:54,609 WARN L191 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 41 [2019-10-15 01:31:54,846 WARN L191 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 45 [2019-10-15 01:31:55,075 WARN L191 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 46