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/loops/vogal-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:04:20,825 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:04:20,828 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:04:20,850 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:04:20,851 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:04:20,853 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:04:20,855 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:04:20,865 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:04:20,867 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:04:20,868 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:04:20,870 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:04:20,871 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:04:20,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:04:20,876 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:04:20,878 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:04:20,880 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:04:20,882 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:04:20,884 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:04:20,886 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:04:20,891 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:04:20,895 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:04:20,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:04:20,901 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:04:20,902 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:04:20,907 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:04:20,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:04:20,918 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:04:20,920 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:04:20,921 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 03:04:20,952 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:04:20,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:04:20,956 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:04:20,956 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:04:20,957 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:04:20,957 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:04:20,957 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:04:20,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:04:20,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:04:20,961 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:04:20,961 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:04:20,961 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:04:20,961 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:04:20,961 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:04:20,962 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:04:20,962 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:04:20,962 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:04:20,964 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:04:20,964 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:04:20,965 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:04:20,965 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:04:20,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:04:20,965 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:04:20,965 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:04:20,966 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:04:20,966 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:04:20,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:04:20,966 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:04:20,966 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 03:04:21,290 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:04:21,312 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:04:21,317 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:04:21,320 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:04:21,320 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:04:21,321 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-2.i [2019-10-15 03:04:21,439 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66f500bc5/fd05b1c6358f4bda82131cb5acfa7434/FLAGb3e1af914 [2019-10-15 03:04:21,950 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:04:21,951 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-2.i [2019-10-15 03:04:21,959 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66f500bc5/fd05b1c6358f4bda82131cb5acfa7434/FLAGb3e1af914 [2019-10-15 03:04:22,288 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66f500bc5/fd05b1c6358f4bda82131cb5acfa7434 [2019-10-15 03:04:22,298 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:04:22,299 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:04:22,303 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:22,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:04:22,307 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:04:22,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a6a6dc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22, skipping insertion in model container [2019-10-15 03:04:22,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,321 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:04:22,343 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:04:22,601 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:22,612 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:04:22,644 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:22,669 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:04:22,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22 WrapperNode [2019-10-15 03:04:22,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:22,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:04:22,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:04:22,671 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:04:22,813 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,836 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,839 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,850 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,858 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,861 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,864 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:04:22,864 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:04:22,865 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:04:22,865 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:04:22,867 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (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 03:04:22,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:04:22,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:04:22,938 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:04:22,938 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:04:22,939 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:04:22,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:04:22,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-10-15 03:04:22,940 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:04:22,940 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 03:04:22,941 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-10-15 03:04:22,941 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 03:04:22,941 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 03:04:22,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 03:04:22,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:04:22,942 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:04:23,572 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:04:23,573 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-15 03:04:23,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:23 BoogieIcfgContainer [2019-10-15 03:04:23,575 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:04:23,576 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:04:23,577 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:04:23,581 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:04:23,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:04:22" (1/3) ... [2019-10-15 03:04:23,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31c1a5a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:23, skipping insertion in model container [2019-10-15 03:04:23,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (2/3) ... [2019-10-15 03:04:23,584 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31c1a5a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:23, skipping insertion in model container [2019-10-15 03:04:23,584 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:23" (3/3) ... [2019-10-15 03:04:23,586 INFO L109 eAbstractionObserver]: Analyzing ICFG vogal-2.i [2019-10-15 03:04:23,597 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:04:23,603 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:04:23,613 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:04:23,638 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:04:23,638 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:04:23,639 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:04:23,639 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:04:23,639 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:04:23,639 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:04:23,639 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:04:23,639 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:04:23,656 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-10-15 03:04:23,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 03:04:23,663 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:23,664 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:23,666 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:23,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:23,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1300943193, now seen corresponding path program 1 times [2019-10-15 03:04:23,680 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:23,681 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363271867] [2019-10-15 03:04:23,681 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:23,681 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:23,681 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:23,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:23,843 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 03:04:23,845 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363271867] [2019-10-15 03:04:23,846 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:23,846 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 03:04:23,847 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860917678] [2019-10-15 03:04:23,852 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 03:04:23,853 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:23,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 03:04:23,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:04:23,871 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2019-10-15 03:04:23,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:23,894 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2019-10-15 03:04:23,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 03:04:23,895 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2019-10-15 03:04:23,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:23,903 INFO L225 Difference]: With dead ends: 42 [2019-10-15 03:04:23,903 INFO L226 Difference]: Without dead ends: 19 [2019-10-15 03:04:23,907 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:04:23,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-15 03:04:23,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-15 03:04:23,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-15 03:04:23,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2019-10-15 03:04:23,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 14 [2019-10-15 03:04:23,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:23,945 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2019-10-15 03:04:23,945 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 03:04:23,946 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2019-10-15 03:04:23,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 03:04:23,947 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:23,947 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:23,947 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:23,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:23,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1331812321, now seen corresponding path program 1 times [2019-10-15 03:04:23,952 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:23,952 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630908126] [2019-10-15 03:04:23,954 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:23,954 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:23,954 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:24,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:24,077 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 03:04:24,077 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630908126] [2019-10-15 03:04:24,078 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:24,078 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:04:24,080 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085854563] [2019-10-15 03:04:24,082 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:04:24,083 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:24,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:04:24,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:04:24,084 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand 3 states. [2019-10-15 03:04:24,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:24,158 INFO L93 Difference]: Finished difference Result 39 states and 53 transitions. [2019-10-15 03:04:24,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:04:24,159 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-15 03:04:24,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:24,162 INFO L225 Difference]: With dead ends: 39 [2019-10-15 03:04:24,162 INFO L226 Difference]: Without dead ends: 26 [2019-10-15 03:04:24,163 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 03:04:24,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-15 03:04:24,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2019-10-15 03:04:24,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 03:04:24,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2019-10-15 03:04:24,171 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 16 [2019-10-15 03:04:24,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:24,171 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2019-10-15 03:04:24,172 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:04:24,172 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2019-10-15 03:04:24,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 03:04:24,173 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:24,173 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:24,173 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:24,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:24,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1442987554, now seen corresponding path program 1 times [2019-10-15 03:04:24,174 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:24,175 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061921969] [2019-10-15 03:04:24,175 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:24,175 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:24,175 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:24,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:24,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:24,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061921969] [2019-10-15 03:04:24,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81496403] [2019-10-15 03:04:24,330 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 03:04:24,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:24,420 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-15 03:04:24,431 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:24,510 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 03:04:24,512 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:24,652 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 03:04:24,653 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 03:04:24,653 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [4] total 12 [2019-10-15 03:04:24,654 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528649103] [2019-10-15 03:04:24,654 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-15 03:04:24,655 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:24,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-15 03:04:24,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-10-15 03:04:24,657 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand 10 states. [2019-10-15 03:04:24,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:24,762 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2019-10-15 03:04:24,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:04:24,763 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2019-10-15 03:04:24,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:24,765 INFO L225 Difference]: With dead ends: 34 [2019-10-15 03:04:24,765 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 03:04:24,766 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-10-15 03:04:24,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 03:04:24,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2019-10-15 03:04:24,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-15 03:04:24,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2019-10-15 03:04:24,781 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 17 [2019-10-15 03:04:24,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:24,782 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2019-10-15 03:04:24,782 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-15 03:04:24,783 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2019-10-15 03:04:24,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 03:04:24,786 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:24,786 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 03:04:25,014 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:25,015 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:25,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:25,017 INFO L82 PathProgramCache]: Analyzing trace with hash -68639491, now seen corresponding path program 1 times [2019-10-15 03:04:25,018 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:25,018 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575530610] [2019-10-15 03:04:25,018 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,019 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,019 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:25,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,181 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:25,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575530610] [2019-10-15 03:04:25,182 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539921966] [2019-10-15 03:04:25,182 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:04:25,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,251 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 03:04:25,254 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:25,278 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:25,278 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:25,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:25,311 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 03:04:25,311 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 8 [2019-10-15 03:04:25,311 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246472696] [2019-10-15 03:04:25,312 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 03:04:25,312 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:25,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 03:04:25,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-10-15 03:04:25,314 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand 6 states. [2019-10-15 03:04:25,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:25,421 INFO L93 Difference]: Finished difference Result 55 states and 76 transitions. [2019-10-15 03:04:25,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 03:04:25,422 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-15 03:04:25,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:25,424 INFO L225 Difference]: With dead ends: 55 [2019-10-15 03:04:25,425 INFO L226 Difference]: Without dead ends: 40 [2019-10-15 03:04:25,427 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-10-15 03:04:25,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-15 03:04:25,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 29. [2019-10-15 03:04:25,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 03:04:25,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2019-10-15 03:04:25,435 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 20 [2019-10-15 03:04:25,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:25,436 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2019-10-15 03:04:25,436 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 03:04:25,436 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2019-10-15 03:04:25,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 03:04:25,437 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:25,437 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] [2019-10-15 03:04:25,641 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:25,641 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:25,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:25,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1439104631, now seen corresponding path program 1 times [2019-10-15 03:04:25,643 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:25,643 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654948783] [2019-10-15 03:04:25,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:25,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,800 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:04:25,801 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654948783] [2019-10-15 03:04:25,801 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804996165] [2019-10-15 03:04:25,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:04:25,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,863 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-15 03:04:25,867 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:26,006 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-15 03:04:26,007 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,015 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:26,015 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,015 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-15 03:04:26,029 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:04:26,030 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:26,113 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:26,139 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 03:04:26,163 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 13 [2019-10-15 03:04:26,165 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,183 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:26,184 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2019-10-15 03:04:26,186 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:26,187 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,212 INFO L567 ElimStorePlain]: treesize reduction 13, result has 35.0 percent of original size [2019-10-15 03:04:26,213 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,214 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:7 [2019-10-15 03:04:26,278 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:26,282 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 03:04:26,283 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 9] total 15 [2019-10-15 03:04:26,285 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555089042] [2019-10-15 03:04:26,287 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 03:04:26,289 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:26,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 03:04:26,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2019-10-15 03:04:26,291 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 7 states. [2019-10-15 03:04:26,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:26,525 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2019-10-15 03:04:26,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 03:04:26,526 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-10-15 03:04:26,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:26,527 INFO L225 Difference]: With dead ends: 42 [2019-10-15 03:04:26,527 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 03:04:26,528 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2019-10-15 03:04:26,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 03:04:26,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-10-15 03:04:26,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 03:04:26,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2019-10-15 03:04:26,533 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 21 [2019-10-15 03:04:26,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:26,534 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2019-10-15 03:04:26,534 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 03:04:26,534 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2019-10-15 03:04:26,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 03:04:26,535 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:26,535 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] [2019-10-15 03:04:26,748 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:26,749 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:26,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:26,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1784666200, now seen corresponding path program 1 times [2019-10-15 03:04:26,750 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:26,751 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767537486] [2019-10-15 03:04:26,751 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:26,751 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:26,752 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:26,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:26,976 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:04:26,976 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767537486] [2019-10-15 03:04:26,977 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917986849] [2019-10-15 03:04:26,977 INFO L94 rtionOrderModulation]: Keeping assertion order 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 03:04:27,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:27,056 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-15 03:04:27,060 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:27,196 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-15 03:04:27,197 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:27,200 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:27,200 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:27,200 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-15 03:04:27,213 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:27,214 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:27,281 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:27,282 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:27,284 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:27,304 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:27,305 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2019-10-15 03:04:27,305 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:27,306 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:27,312 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 03:04:27,315 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 13 [2019-10-15 03:04:27,316 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:27,323 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-15 03:04:27,325 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 03:04:27,327 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:27,328 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 15 [2019-10-15 03:04:27,329 INFO L496 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:27,338 INFO L567 ElimStorePlain]: treesize reduction 13, result has 35.0 percent of original size [2019-10-15 03:04:27,338 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:27,339 INFO L221 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:85, output treesize:7 [2019-10-15 03:04:27,360 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:04:27,361 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737674236] [2019-10-15 03:04:27,410 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 03:04:27,412 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:27,425 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:27,455 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:27,456 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:27,576 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:04:27,859 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:04:28,402 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-10-15 03:04:28,420 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:04:28,425 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:29,701 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:04:29,701 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 9, 7, 15] total 29 [2019-10-15 03:04:29,702 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789072859] [2019-10-15 03:04:29,703 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-15 03:04:29,703 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:29,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-15 03:04:29,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2019-10-15 03:04:29,704 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand 29 states. [2019-10-15 03:04:30,495 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2019-10-15 03:04:30,770 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 40 [2019-10-15 03:04:30,968 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 42 [2019-10-15 03:04:31,163 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 46 [2019-10-15 03:04:31,669 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 42 [2019-10-15 03:04:32,627 WARN L191 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 55 [2019-10-15 03:04:32,893 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 59 [2019-10-15 03:04:33,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:33,258 INFO L93 Difference]: Finished difference Result 50 states and 73 transitions. [2019-10-15 03:04:33,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-15 03:04:33,259 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 22 [2019-10-15 03:04:33,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:33,260 INFO L225 Difference]: With dead ends: 50 [2019-10-15 03:04:33,260 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 03:04:33,263 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=434, Invalid=2322, Unknown=0, NotChecked=0, Total=2756 [2019-10-15 03:04:33,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 03:04:33,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2019-10-15 03:04:33,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 03:04:33,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2019-10-15 03:04:33,271 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 22 [2019-10-15 03:04:33,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:33,272 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2019-10-15 03:04:33,272 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-15 03:04:33,272 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2019-10-15 03:04:33,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 03:04:33,273 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:33,273 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:33,486 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:33,487 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:33,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:33,487 INFO L82 PathProgramCache]: Analyzing trace with hash -1863962312, now seen corresponding path program 1 times [2019-10-15 03:04:33,488 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:33,488 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325473974] [2019-10-15 03:04:33,488 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:33,488 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:33,489 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:33,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:33,796 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 03:04:33,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325473974] [2019-10-15 03:04:33,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527540715] [2019-10-15 03:04:33,797 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:04:33,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:33,895 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 03:04:33,906 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:33,935 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-10-15 03:04:33,935 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:34,030 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 03:04:34,030 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1933363726] [2019-10-15 03:04:34,033 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:04:34,033 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:34,034 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:34,034 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:34,035 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:34,077 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:04:34,210 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:04:34,873 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-10-15 03:04:34,883 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:04:34,890 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:35,577 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:04:35,577 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 6, 16] total 26 [2019-10-15 03:04:35,578 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621270376] [2019-10-15 03:04:35,579 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 03:04:35,579 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:35,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 03:04:35,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=580, Unknown=0, NotChecked=0, Total=650 [2019-10-15 03:04:35,581 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand 26 states. [2019-10-15 03:04:37,035 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2019-10-15 03:04:37,298 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 49 [2019-10-15 03:04:37,634 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 43 [2019-10-15 03:04:38,189 WARN L191 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 45 [2019-10-15 03:04:38,769 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 46 [2019-10-15 03:04:40,297 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 51 [2019-10-15 03:04:41,147 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 47 [2019-10-15 03:04:41,569 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2019-10-15 03:04:41,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:41,669 INFO L93 Difference]: Finished difference Result 100 states and 136 transitions. [2019-10-15 03:04:41,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-10-15 03:04:41,669 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2019-10-15 03:04:41,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:41,671 INFO L225 Difference]: With dead ends: 100 [2019-10-15 03:04:41,671 INFO L226 Difference]: Without dead ends: 78 [2019-10-15 03:04:41,674 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1151 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=868, Invalid=4244, Unknown=0, NotChecked=0, Total=5112 [2019-10-15 03:04:41,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-15 03:04:41,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 34. [2019-10-15 03:04:41,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-15 03:04:41,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-10-15 03:04:41,698 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2019-10-15 03:04:41,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:41,698 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-10-15 03:04:41,698 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 03:04:41,699 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-10-15 03:04:41,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-15 03:04:41,712 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:41,712 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:41,917 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:41,918 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:41,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:41,919 INFO L82 PathProgramCache]: Analyzing trace with hash -988618494, now seen corresponding path program 2 times [2019-10-15 03:04:41,920 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:41,920 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571959290] [2019-10-15 03:04:41,920 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:41,920 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:41,920 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:41,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:42,053 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-15 03:04:42,054 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571959290] [2019-10-15 03:04:42,054 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41123971] [2019-10-15 03:04:42,054 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 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 03:04:42,185 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 03:04:42,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:04:42,186 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-15 03:04:42,188 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:42,219 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-15 03:04:42,220 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:42,316 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-15 03:04:42,316 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [542636577] [2019-10-15 03:04:42,318 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:04:42,318 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:42,319 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:42,319 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:42,319 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:42,338 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:04:42,448 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:04:42,849 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-10-15 03:04:42,856 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:04:42,859 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:43,406 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:04:43,407 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 16] total 28 [2019-10-15 03:04:43,407 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555580832] [2019-10-15 03:04:43,408 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-15 03:04:43,408 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:43,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-15 03:04:43,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2019-10-15 03:04:43,410 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 28 states. [2019-10-15 03:04:44,133 WARN L191 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 20 [2019-10-15 03:04:47,666 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 48 [2019-10-15 03:04:51,945 WARN L191 SmtUtils]: Spent 4.18 s on a formula simplification. DAG size of input: 57 DAG size of output: 49 [2019-10-15 03:04:52,096 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 44 [2019-10-15 03:04:52,952 WARN L191 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2019-10-15 03:04:53,325 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 44 [2019-10-15 03:04:55,549 WARN L191 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 49 [2019-10-15 03:04:55,818 WARN L191 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 52 [2019-10-15 03:05:00,061 WARN L191 SmtUtils]: Spent 4.16 s on a formula simplification. DAG size of input: 68 DAG size of output: 52 [2019-10-15 03:05:00,777 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 52 [2019-10-15 03:05:01,043 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 48