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_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:34:47,408 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:34:47,411 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:34:47,431 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:34:47,431 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:34:47,433 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:34:47,435 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:34:47,445 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:34:47,451 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:34:47,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:34:47,455 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:34:47,457 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:34:47,457 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:34:47,459 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:34:47,463 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:34:47,464 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:34:47,466 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:34:47,467 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:34:47,468 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:34:47,474 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:34:47,479 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:34:47,482 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:34:47,485 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:34:47,487 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:34:47,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:34:47,500 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:34:47,501 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:34:47,502 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:34:47,503 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 01:34:47,538 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:34:47,539 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:34:47,544 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:34:47,544 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:34:47,544 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:34:47,545 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:34:47,545 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:34:47,545 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:34:47,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:34:47,545 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:34:47,546 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:34:47,546 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:34:47,546 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:34:47,549 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:34:47,550 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:34:47,550 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:34:47,550 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:34:47,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:34:47,550 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:34:47,551 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:34:47,551 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:34:47,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:34:47,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:34:47,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:34:47,552 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:34:47,552 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:34:47,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:34:47,552 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:34:47,552 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 01:34:47,892 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:34:47,912 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:34:47,917 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:34:47,918 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:34:47,919 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:34:47,919 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-15 01:34:47,997 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37b61764b/3d4664cfa4d94d919f9e705273100245/FLAG1a93c8c29 [2019-10-15 01:34:48,444 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:34:48,445 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-15 01:34:48,452 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37b61764b/3d4664cfa4d94d919f9e705273100245/FLAG1a93c8c29 [2019-10-15 01:34:48,864 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37b61764b/3d4664cfa4d94d919f9e705273100245 [2019-10-15 01:34:48,875 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:34:48,877 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:34:48,878 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:34:48,878 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:34:48,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:34:48,883 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:34:48" (1/1) ... [2019-10-15 01:34:48,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4db268e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:48, skipping insertion in model container [2019-10-15 01:34:48,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:34:48" (1/1) ... [2019-10-15 01:34:48,894 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:34:48,911 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:34:49,119 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:34:49,129 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:34:49,156 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:34:49,180 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:34:49,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49 WrapperNode [2019-10-15 01:34:49,182 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:34:49,183 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:34:49,183 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:34:49,183 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:34:49,280 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,284 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,294 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,294 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,301 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,307 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,309 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (1/1) ... [2019-10-15 01:34:49,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:34:49,312 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:34:49,312 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:34:49,312 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:34:49,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (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 01:34:49,379 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:34:49,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:34:49,380 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:34:49,380 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:34:49,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:34:49,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:34:49,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:34:49,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:34:49,382 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:34:49,382 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:34:49,383 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:34:49,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:34:49,384 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:34:49,384 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:34:49,759 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:34:49,760 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 01:34:49,761 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:34:49 BoogieIcfgContainer [2019-10-15 01:34:49,761 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:34:49,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:34:49,763 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:34:49,766 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:34:49,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:34:48" (1/3) ... [2019-10-15 01:34:49,767 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@596d5be3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:34:49, skipping insertion in model container [2019-10-15 01:34:49,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:34:49" (2/3) ... [2019-10-15 01:34:49,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@596d5be3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:34:49, skipping insertion in model container [2019-10-15 01:34:49,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:34:49" (3/3) ... [2019-10-15 01:34:49,770 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-10-15 01:34:49,780 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:34:49,787 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:34:49,797 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:34:49,819 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:34:49,820 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:34:49,820 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:34:49,820 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:34:49,820 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:34:49,820 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:34:49,820 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:34:49,821 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:34:49,835 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-15 01:34:49,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:34:49,841 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:34:49,842 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:34:49,844 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:34:49,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:34:49,849 INFO L82 PathProgramCache]: Analyzing trace with hash -973561822, now seen corresponding path program 1 times [2019-10-15 01:34:49,856 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:34:49,857 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357605429] [2019-10-15 01:34:49,857 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:49,857 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:49,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:34:49,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:50,010 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 01:34:50,011 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357605429] [2019-10-15 01:34:50,011 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:34:50,012 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:34:50,012 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711820611] [2019-10-15 01:34:50,016 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:34:50,016 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:34:50,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:34:50,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:34:50,030 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-10-15 01:34:50,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:34:50,076 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2019-10-15 01:34:50,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:34:50,078 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:34:50,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:34:50,088 INFO L225 Difference]: With dead ends: 34 [2019-10-15 01:34:50,088 INFO L226 Difference]: Without dead ends: 18 [2019-10-15 01:34:50,091 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 01:34:50,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-15 01:34:50,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-15 01:34:50,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:34:50,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-15 01:34:50,124 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2019-10-15 01:34:50,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:34:50,125 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-15 01:34:50,125 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:34:50,125 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-15 01:34:50,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:34:50,126 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:34:50,126 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:34:50,126 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:34:50,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:34:50,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1894348460, now seen corresponding path program 1 times [2019-10-15 01:34:50,127 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:34:50,127 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883179286] [2019-10-15 01:34:50,128 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:50,128 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:50,128 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:34:50,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:50,197 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 01:34:50,197 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883179286] [2019-10-15 01:34:50,198 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989782172] [2019-10-15 01:34:50,198 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 01:34:50,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:50,260 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:34:50,267 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:34:50,305 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 01:34:50,306 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:34:50,342 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 01:34:50,343 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1437200866] [2019-10-15 01:34:50,368 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:34:50,369 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:34:50,376 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:34:50,383 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:34:50,384 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:34:50,556 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:34:50,999 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-10-15 01:34:51,018 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:34:51,031 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:34:51,411 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:34:51,411 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-10-15 01:34:51,412 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166542095] [2019-10-15 01:34:51,415 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-15 01:34:51,415 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:34:51,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-15 01:34:51,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2019-10-15 01:34:51,419 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2019-10-15 01:34:52,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:34:52,026 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2019-10-15 01:34:52,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-15 01:34:52,027 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 14 [2019-10-15 01:34:52,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:34:52,028 INFO L225 Difference]: With dead ends: 42 [2019-10-15 01:34:52,029 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:34:52,030 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=150, Invalid=606, Unknown=0, NotChecked=0, Total=756 [2019-10-15 01:34:52,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:34:52,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 22. [2019-10-15 01:34:52,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:34:52,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-15 01:34:52,040 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2019-10-15 01:34:52,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:34:52,041 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-15 01:34:52,041 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-15 01:34:52,041 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-15 01:34:52,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 01:34:52,042 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:34:52,043 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:34:52,246 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:34:52,247 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:34:52,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:34:52,247 INFO L82 PathProgramCache]: Analyzing trace with hash -317151134, now seen corresponding path program 2 times [2019-10-15 01:34:52,248 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:34:52,248 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850149447] [2019-10-15 01:34:52,248 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:52,249 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:52,249 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:34:52,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:52,368 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:34:52,368 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850149447] [2019-10-15 01:34:52,369 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430703306] [2019-10-15 01:34:52,369 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 01:34:52,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:34:52,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:34:52,435 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:34:52,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:34:52,451 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:34:52,451 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:34:52,485 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:34:52,485 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131309366] [2019-10-15 01:34:52,487 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:34:52,487 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:34:52,487 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:34:52,488 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:34:52,488 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:34:52,527 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:34:52,734 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-10-15 01:34:52,751 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:34:52,757 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:34:53,050 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:34:53,050 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 11] total 21 [2019-10-15 01:34:53,050 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66131447] [2019-10-15 01:34:53,051 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-15 01:34:53,052 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:34:53,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-15 01:34:53,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2019-10-15 01:34:53,053 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 21 states. [2019-10-15 01:34:53,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:34:53,759 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2019-10-15 01:34:53,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:34:53,765 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 18 [2019-10-15 01:34:53,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:34:53,766 INFO L225 Difference]: With dead ends: 53 [2019-10-15 01:34:53,766 INFO L226 Difference]: Without dead ends: 41 [2019-10-15 01:34:53,767 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2019-10-15 01:34:53,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-15 01:34:53,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2019-10-15 01:34:53,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:34:53,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-15 01:34:53,776 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 18 [2019-10-15 01:34:53,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:34:53,776 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-15 01:34:53,776 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-15 01:34:53,776 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-15 01:34:53,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:34:53,777 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:34:53,778 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:34:53,981 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:34:53,981 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:34:53,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:34:53,982 INFO L82 PathProgramCache]: Analyzing trace with hash -418739934, now seen corresponding path program 3 times [2019-10-15 01:34:53,983 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:34:53,983 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524332229] [2019-10-15 01:34:53,984 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:53,984 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:53,984 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:34:54,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:54,167 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 01:34:54,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524332229] [2019-10-15 01:34:54,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684371757] [2019-10-15 01:34:54,168 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 01:34:54,239 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:34:54,239 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:34:54,240 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:34:54,244 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:34:54,260 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 01:34:54,260 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:34:54,402 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 01:34:54,402 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1246985743] [2019-10-15 01:34:54,405 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:34:54,405 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:34:54,406 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:34:54,406 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:34:54,406 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:34:54,449 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:34:54,650 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-10-15 01:34:54,663 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:34:54,667 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:34:54,989 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:34:54,990 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 31 [2019-10-15 01:34:54,990 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134183987] [2019-10-15 01:34:54,991 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-15 01:34:54,992 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:34:54,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-15 01:34:54,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=690, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:34:54,994 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 31 states. [2019-10-15 01:34:56,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:34:56,171 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2019-10-15 01:34:56,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-15 01:34:56,171 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 28 [2019-10-15 01:34:56,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:34:56,173 INFO L225 Difference]: With dead ends: 70 [2019-10-15 01:34:56,173 INFO L226 Difference]: Without dead ends: 52 [2019-10-15 01:34:56,175 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=745, Invalid=2335, Unknown=0, NotChecked=0, Total=3080 [2019-10-15 01:34:56,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-15 01:34:56,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2019-10-15 01:34:56,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-15 01:34:56,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2019-10-15 01:34:56,185 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 28 [2019-10-15 01:34:56,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:34:56,185 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2019-10-15 01:34:56,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-15 01:34:56,186 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2019-10-15 01:34:56,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-15 01:34:56,187 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:34:56,187 INFO L380 BasicCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:34:56,391 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:34:56,391 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:34:56,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:34:56,392 INFO L82 PathProgramCache]: Analyzing trace with hash 798654980, now seen corresponding path program 4 times [2019-10-15 01:34:56,393 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:34:56,393 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324763071] [2019-10-15 01:34:56,394 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:56,394 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:34:56,394 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:34:56,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:56,665 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-15 01:34:56,665 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324763071] [2019-10-15 01:34:56,665 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338936117] [2019-10-15 01:34:56,665 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 01:34:56,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:34:56,747 INFO L256 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-15 01:34:56,749 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:34:56,781 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-15 01:34:56,781 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:34:57,308 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-10-15 01:34:57,309 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494200714] [2019-10-15 01:34:57,311 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:34:57,311 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:34:57,311 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:34:57,312 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:34:57,312 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:34:57,341 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:34:57,507 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-10-15 01:34:57,533 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:34:57,538 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:34:57,913 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:34:57,913 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 11] total 51 [2019-10-15 01:34:57,914 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985345898] [2019-10-15 01:34:57,915 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-10-15 01:34:57,915 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:34:57,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-10-15 01:34:57,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=1700, Unknown=0, NotChecked=0, Total=2550 [2019-10-15 01:34:57,919 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 51 states. [2019-10-15 01:35:00,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:00,604 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2019-10-15 01:35:00,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-10-15 01:35:00,605 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 39 [2019-10-15 01:35:00,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:00,607 INFO L225 Difference]: With dead ends: 101 [2019-10-15 01:35:00,607 INFO L226 Difference]: Without dead ends: 82 [2019-10-15 01:35:00,611 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2615, Invalid=6505, Unknown=0, NotChecked=0, Total=9120 [2019-10-15 01:35:00,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-10-15 01:35:00,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 73. [2019-10-15 01:35:00,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-15 01:35:00,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2019-10-15 01:35:00,623 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 39 [2019-10-15 01:35:00,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:00,623 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2019-10-15 01:35:00,624 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-10-15 01:35:00,624 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2019-10-15 01:35:00,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-15 01:35:00,626 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:00,626 INFO L380 BasicCegarLoop]: trace histogram [38, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:00,833 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:00,834 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:00,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:00,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1517035324, now seen corresponding path program 5 times [2019-10-15 01:35:00,835 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:00,836 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576404830] [2019-10-15 01:35:00,836 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:00,836 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:00,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:00,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:02,046 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-10-15 01:35:02,047 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576404830] [2019-10-15 01:35:02,047 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844869553] [2019-10-15 01:35:02,047 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 01:35:15,184 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-10-15 01:35:15,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:15,193 INFO L256 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-15 01:35:15,197 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:15,218 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-10-15 01:35:15,219 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:16,077 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-10-15 01:35:16,078 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521835431] [2019-10-15 01:35:16,079 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:16,079 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:16,079 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:16,080 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:16,080 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:16,104 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:35:16,234 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-10-15 01:35:16,243 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:35:16,249 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:16,726 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:16,726 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 22, 22, 11] total 72 [2019-10-15 01:35:16,727 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835184500] [2019-10-15 01:35:16,729 INFO L442 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-10-15 01:35:16,729 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:16,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-10-15 01:35:16,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1921, Invalid=3191, Unknown=0, NotChecked=0, Total=5112 [2019-10-15 01:35:16,732 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 72 states. [2019-10-15 01:35:21,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:21,285 INFO L93 Difference]: Finished difference Result 172 states and 236 transitions. [2019-10-15 01:35:21,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-10-15 01:35:21,285 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 69 [2019-10-15 01:35:21,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:21,288 INFO L225 Difference]: With dead ends: 172 [2019-10-15 01:35:21,288 INFO L226 Difference]: Without dead ends: 143 [2019-10-15 01:35:21,293 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3619 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5752, Invalid=13154, Unknown=0, NotChecked=0, Total=18906 [2019-10-15 01:35:21,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-10-15 01:35:21,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 134. [2019-10-15 01:35:21,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-10-15 01:35:21,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2019-10-15 01:35:21,312 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 69 [2019-10-15 01:35:21,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:21,313 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2019-10-15 01:35:21,313 INFO L463 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-10-15 01:35:21,313 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2019-10-15 01:35:21,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-10-15 01:35:21,334 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:21,334 INFO L380 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:21,534 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:21,535 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:21,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:21,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1462323180, now seen corresponding path program 6 times [2019-10-15 01:35:21,537 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:21,537 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169800968] [2019-10-15 01:35:21,538 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:21,538 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:21,538 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:21,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:23,033 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-10-15 01:35:23,034 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169800968] [2019-10-15 01:35:23,034 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590409429] [2019-10-15 01:35:23,034 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:23,206 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:35:23,206 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:23,209 INFO L256 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 61 conjunts are in the unsatisfiable core [2019-10-15 01:35:23,223 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:23,267 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-10-15 01:35:23,267 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:27,187 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2019-10-15 01:35:27,187 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [169183543] [2019-10-15 01:35:27,189 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:27,189 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:27,189 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:27,189 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:27,190 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:27,210 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:35:27,338 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-10-15 01:35:27,348 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:35:27,352 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:27,905 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:27,906 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62, 11] total 133 [2019-10-15 01:35:27,906 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391398499] [2019-10-15 01:35:27,907 INFO L442 AbstractCegarLoop]: Interpolant automaton has 133 states [2019-10-15 01:35:27,908 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:27,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2019-10-15 01:35:27,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7533, Invalid=10023, Unknown=0, NotChecked=0, Total=17556 [2019-10-15 01:35:27,913 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand 133 states.