java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_two_index_06.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:35:41,610 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:35:41,612 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:35:41,624 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:35:41,625 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:35:41,626 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:35:41,627 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:35:41,629 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:35:41,630 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:35:41,631 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:35:41,632 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:35:41,633 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:35:41,633 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:35:41,634 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:35:41,635 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:35:41,636 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:35:41,637 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:35:41,638 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:35:41,640 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:35:41,641 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:35:41,643 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:35:41,644 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:35:41,645 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:35:41,646 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:35:41,648 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:35:41,655 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:35:41,656 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:35:41,656 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:35:41,657 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 01:35:41,671 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:35:41,671 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:35:41,672 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:35:41,672 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:35:41,673 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:35:41,673 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:35:41,673 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:35:41,673 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:35:41,673 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:35:41,674 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:35:41,674 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:35:41,674 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:35:41,674 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:35:41,674 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:35:41,674 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:35:41,675 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:35:41,675 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:35:41,675 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:35:41,675 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:35:41,675 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:35:41,676 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:35:41,676 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:35:41,676 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:35:41,676 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:35:41,676 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:35:41,677 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:35:41,677 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:35:41,677 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:35:41,677 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 01:35:41,985 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:35:41,999 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:35:42,003 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:35:42,005 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:35:42,005 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:35:42,006 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_06.i [2019-10-15 01:35:42,081 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c300f8a02/d1e2bf5b4649464e9871c6f4657cf787/FLAG78f606477 [2019-10-15 01:35:42,573 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:35:42,574 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_06.i [2019-10-15 01:35:42,581 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c300f8a02/d1e2bf5b4649464e9871c6f4657cf787/FLAG78f606477 [2019-10-15 01:35:42,984 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c300f8a02/d1e2bf5b4649464e9871c6f4657cf787 [2019-10-15 01:35:42,995 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:35:42,997 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:35:43,000 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:35:43,000 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:35:43,003 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:35:43,004 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:35:42" (1/1) ... [2019-10-15 01:35:43,007 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2be43138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43, skipping insertion in model container [2019-10-15 01:35:43,007 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:35:42" (1/1) ... [2019-10-15 01:35:43,015 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:35:43,035 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:35:43,207 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:35:43,211 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:35:43,230 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:35:43,248 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:35:43,248 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43 WrapperNode [2019-10-15 01:35:43,248 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:35:43,249 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:35:43,249 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:35:43,249 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:35:43,337 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,338 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,344 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,345 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,351 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,356 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,357 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (1/1) ... [2019-10-15 01:35:43,359 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:35:43,360 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:35:43,360 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:35:43,360 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:35:43,361 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (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 01:35:43,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:35:43,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:35:43,409 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:35:43,409 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:35:43,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:35:43,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:35:43,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:35:43,410 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:35:43,410 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:35:43,410 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:35:43,410 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:35:43,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:35:43,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:35:43,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:35:43,722 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:35:43,723 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 01:35:43,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:35:43 BoogieIcfgContainer [2019-10-15 01:35:43,724 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:35:43,725 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:35:43,725 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:35:43,730 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:35:43,730 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:35:42" (1/3) ... [2019-10-15 01:35:43,731 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2809c381 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:35:43, skipping insertion in model container [2019-10-15 01:35:43,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:43" (2/3) ... [2019-10-15 01:35:43,731 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2809c381 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:35:43, skipping insertion in model container [2019-10-15 01:35:43,732 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:35:43" (3/3) ... [2019-10-15 01:35:43,733 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_06.i [2019-10-15 01:35:43,748 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:35:43,754 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:35:43,764 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:35:43,787 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:35:43,788 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:35:43,788 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:35:43,788 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:35:43,788 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:35:43,788 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:35:43,789 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:35:43,789 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:35:43,803 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-15 01:35:43,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:35:43,807 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:43,808 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:43,810 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:43,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:43,814 INFO L82 PathProgramCache]: Analyzing trace with hash 328370140, now seen corresponding path program 1 times [2019-10-15 01:35:43,821 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:43,821 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967401338] [2019-10-15 01:35:43,822 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:43,822 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:43,822 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:43,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:43,980 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 01:35:43,981 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967401338] [2019-10-15 01:35:43,981 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:35:43,982 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:35:43,982 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972262475] [2019-10-15 01:35:43,987 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:35:43,987 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:43,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:35:44,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:35:44,002 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-10-15 01:35:44,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:44,061 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-10-15 01:35:44,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:35:44,063 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:35:44,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:44,070 INFO L225 Difference]: With dead ends: 33 [2019-10-15 01:35:44,071 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 01:35:44,073 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 01:35:44,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 01:35:44,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-15 01:35:44,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 01:35:44,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-10-15 01:35:44,106 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-10-15 01:35:44,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:44,106 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-10-15 01:35:44,106 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:35:44,106 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-10-15 01:35:44,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:35:44,107 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:44,107 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:44,108 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:44,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:44,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1896737256, now seen corresponding path program 1 times [2019-10-15 01:35:44,109 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:44,109 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138164171] [2019-10-15 01:35:44,117 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:44,118 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:44,118 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:44,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:44,176 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 01:35:44,177 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138164171] [2019-10-15 01:35:44,177 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:35:44,178 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:35:44,178 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573894914] [2019-10-15 01:35:44,179 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:35:44,179 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:44,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:35:44,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:35:44,180 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-10-15 01:35:44,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:44,224 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-10-15 01:35:44,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:35:44,225 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-15 01:35:44,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:44,228 INFO L225 Difference]: With dead ends: 30 [2019-10-15 01:35:44,228 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 01:35:44,229 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 01:35:44,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 01:35:44,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2019-10-15 01:35:44,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:35:44,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-15 01:35:44,238 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-10-15 01:35:44,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:44,239 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-15 01:35:44,239 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:35:44,239 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-15 01:35:44,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:35:44,240 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:44,240 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:44,240 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:44,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:44,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1718311367, now seen corresponding path program 1 times [2019-10-15 01:35:44,241 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:44,242 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573729000] [2019-10-15 01:35:44,242 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:44,242 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:44,242 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:44,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:44,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:35:44,326 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573729000] [2019-10-15 01:35:44,327 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149011989] [2019-10-15 01:35:44,327 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 01:35:44,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:44,384 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:35:44,390 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:44,436 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:35:44,437 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:44,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:35:44,469 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871523879] [2019-10-15 01:35:44,494 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:44,494 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:44,500 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:44,507 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:44,508 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:44,685 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:35:45,233 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:35:45,254 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:35:45,263 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:45,583 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:45,583 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:35:45,584 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486643510] [2019-10-15 01:35:45,585 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:35:45,586 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:45,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:35:45,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:35:45,588 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 18 states. [2019-10-15 01:35:46,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:46,332 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2019-10-15 01:35:46,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-15 01:35:46,333 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2019-10-15 01:35:46,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:46,334 INFO L225 Difference]: With dead ends: 50 [2019-10-15 01:35:46,334 INFO L226 Difference]: Without dead ends: 39 [2019-10-15 01:35:46,335 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=234, Invalid=888, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:35:46,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-15 01:35:46,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 24. [2019-10-15 01:35:46,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:35:46,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-15 01:35:46,350 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 14 [2019-10-15 01:35:46,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:46,350 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-15 01:35:46,350 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:35:46,351 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-15 01:35:46,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:35:46,352 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:46,352 INFO L380 BasicCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:46,557 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:46,558 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:46,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:46,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1363999975, now seen corresponding path program 2 times [2019-10-15 01:35:46,559 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:46,560 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43919412] [2019-10-15 01:35:46,560 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:46,560 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:46,560 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:46,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:46,672 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 01:35:46,672 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43919412] [2019-10-15 01:35:46,672 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19180991] [2019-10-15 01:35:46,673 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 01:35:46,727 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:35:46,728 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:46,729 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:35:46,730 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:46,740 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 01:35:46,740 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:46,782 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 01:35:46,782 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [98425187] [2019-10-15 01:35:46,783 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:46,783 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:46,784 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:46,784 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:46,784 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:46,812 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:35:47,129 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:35:47,139 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:35:47,144 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:47,524 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:47,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 11] total 21 [2019-10-15 01:35:47,525 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057594398] [2019-10-15 01:35:47,528 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-15 01:35:47,528 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:47,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-15 01:35:47,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2019-10-15 01:35:47,529 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 21 states. [2019-10-15 01:35:48,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:48,420 INFO L93 Difference]: Finished difference Result 73 states and 90 transitions. [2019-10-15 01:35:48,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-15 01:35:48,421 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2019-10-15 01:35:48,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:48,422 INFO L225 Difference]: With dead ends: 73 [2019-10-15 01:35:48,423 INFO L226 Difference]: Without dead ends: 60 [2019-10-15 01:35:48,424 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=436, Invalid=1456, Unknown=0, NotChecked=0, Total=1892 [2019-10-15 01:35:48,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-15 01:35:48,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 32. [2019-10-15 01:35:48,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:35:48,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-15 01:35:48,434 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2019-10-15 01:35:48,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:48,435 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-15 01:35:48,435 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-15 01:35:48,435 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-15 01:35:48,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:35:48,436 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:48,436 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:48,643 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:48,643 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:48,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:48,644 INFO L82 PathProgramCache]: Analyzing trace with hash 311824988, now seen corresponding path program 3 times [2019-10-15 01:35:48,644 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:48,644 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045709121] [2019-10-15 01:35:48,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:48,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:48,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:48,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:48,779 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-15 01:35:48,779 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045709121] [2019-10-15 01:35:48,779 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708553808] [2019-10-15 01:35:48,780 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 01:35:48,855 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:35:48,855 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:48,857 INFO L256 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:35:48,865 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:48,944 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-15 01:35:48,945 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:49,134 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-15 01:35:49,135 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1698942538] [2019-10-15 01:35:49,137 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:49,137 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:49,138 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:49,138 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:49,139 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:49,194 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:35:49,502 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:35:49,510 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:35:49,514 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:49,828 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:49,829 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 38 [2019-10-15 01:35:49,829 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172032670] [2019-10-15 01:35:49,830 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-15 01:35:49,830 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:49,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-15 01:35:49,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=949, Unknown=0, NotChecked=0, Total=1406 [2019-10-15 01:35:49,832 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 38 states. [2019-10-15 01:35:51,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:51,687 INFO L93 Difference]: Finished difference Result 109 states and 142 transitions. [2019-10-15 01:35:51,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-10-15 01:35:51,688 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 28 [2019-10-15 01:35:51,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:51,690 INFO L225 Difference]: With dead ends: 109 [2019-10-15 01:35:51,690 INFO L226 Difference]: Without dead ends: 91 [2019-10-15 01:35:51,694 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2127 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1752, Invalid=4890, Unknown=0, NotChecked=0, Total=6642 [2019-10-15 01:35:51,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-15 01:35:51,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 52. [2019-10-15 01:35:51,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-15 01:35:51,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-10-15 01:35:51,708 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 28 [2019-10-15 01:35:51,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:51,708 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-10-15 01:35:51,708 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-15 01:35:51,709 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-10-15 01:35:51,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-15 01:35:51,710 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:51,710 INFO L380 BasicCegarLoop]: trace histogram [25, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:51,930 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:51,931 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:51,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:51,932 INFO L82 PathProgramCache]: Analyzing trace with hash 102164889, now seen corresponding path program 4 times [2019-10-15 01:35:51,933 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:51,933 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172681841] [2019-10-15 01:35:51,934 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:51,934 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:51,934 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:51,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:52,114 INFO L134 CoverageAnalysis]: Checked inductivity of 391 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2019-10-15 01:35:52,114 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172681841] [2019-10-15 01:35:52,114 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606758277] [2019-10-15 01:35:52,115 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 01:35:52,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:52,208 INFO L256 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-15 01:35:52,211 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:52,364 INFO L134 CoverageAnalysis]: Checked inductivity of 391 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-15 01:35:52,364 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:52,994 INFO L134 CoverageAnalysis]: Checked inductivity of 391 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-15 01:35:52,994 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184812416] [2019-10-15 01:35:52,995 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:52,995 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:52,996 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:52,996 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:52,996 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:53,024 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:35:53,303 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 44 [2019-10-15 01:35:53,369 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:35:53,384 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:35:53,389 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:53,701 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:53,701 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 28, 28, 11] total 72 [2019-10-15 01:35:53,701 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450891089] [2019-10-15 01:35:53,702 INFO L442 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-10-15 01:35:53,703 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:53,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-10-15 01:35:53,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2038, Invalid=3074, Unknown=0, NotChecked=0, Total=5112 [2019-10-15 01:35:53,708 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 72 states. [2019-10-15 01:35:58,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:58,171 INFO L93 Difference]: Finished difference Result 170 states and 229 transitions. [2019-10-15 01:35:58,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2019-10-15 01:35:58,172 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 48 [2019-10-15 01:35:58,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:58,174 INFO L225 Difference]: With dead ends: 170 [2019-10-15 01:35:58,174 INFO L226 Difference]: Without dead ends: 149 [2019-10-15 01:35:58,181 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8639 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7286, Invalid=16894, Unknown=0, NotChecked=0, Total=24180 [2019-10-15 01:35:58,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-10-15 01:35:58,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 92. [2019-10-15 01:35:58,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-15 01:35:58,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-10-15 01:35:58,214 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 48 [2019-10-15 01:35:58,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:58,215 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-10-15 01:35:58,215 INFO L463 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-10-15 01:35:58,215 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-10-15 01:35:58,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-10-15 01:35:58,221 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:58,221 INFO L380 BasicCegarLoop]: trace histogram [59, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:58,424 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:58,428 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:58,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:58,429 INFO L82 PathProgramCache]: Analyzing trace with hash -227893063, now seen corresponding path program 5 times [2019-10-15 01:35:58,429 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:58,429 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166380862] [2019-10-15 01:35:58,429 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:58,429 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:58,430 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:58,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:58,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1923 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-10-15 01:35:58,774 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166380862] [2019-10-15 01:35:58,774 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683201127] [2019-10-15 01:35:58,774 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 01:36:25,239 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-15 01:36:25,240 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:36:25,252 INFO L256 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-15 01:36:25,257 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:36:25,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1923 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-10-15 01:36:25,283 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:36:25,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1923 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-10-15 01:36:25,673 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881849432] [2019-10-15 01:36:25,674 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:36:25,674 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:36:25,674 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:36:25,675 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:36:25,675 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:36:25,694 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:36:25,987 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:36:25,998 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:36:26,003 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:36:26,496 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:36:26,496 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 11] total 49 [2019-10-15 01:36:26,496 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511752470] [2019-10-15 01:36:26,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-10-15 01:36:26,499 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:26,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-10-15 01:36:26,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=845, Invalid=1507, Unknown=0, NotChecked=0, Total=2352 [2019-10-15 01:36:26,501 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 49 states.