/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 03:59:42,329 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 03:59:42,332 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 03:59:42,352 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 03:59:42,353 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 03:59:42,355 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 03:59:42,357 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 03:59:42,366 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 03:59:42,371 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 03:59:42,374 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 03:59:42,375 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 03:59:42,377 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 03:59:42,377 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 03:59:42,378 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 03:59:42,380 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 03:59:42,382 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 03:59:42,383 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 03:59:42,384 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 03:59:42,385 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 03:59:42,389 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 03:59:42,393 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 03:59:42,395 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 03:59:42,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 03:59:42,398 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 03:59:42,400 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 03:59:42,409 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 03:59:42,409 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 03:59:42,410 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 03:59:42,411 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 03:59:42,433 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 03:59:42,433 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 03:59:42,434 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 03:59:42,434 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 03:59:42,435 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 03:59:42,435 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 03:59:42,435 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 03:59:42,435 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 03:59:42,436 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 03:59:42,438 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 03:59:42,438 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 03:59:42,438 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 03:59:42,438 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 03:59:42,438 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 03:59:42,439 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 03:59:42,439 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 03:59:42,439 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 03:59:42,439 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 03:59:42,439 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 03:59:42,440 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 03:59:42,440 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 03:59:42,440 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 03:59:42,440 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 03:59:42,440 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 03:59:42,445 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 03:59:42,445 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 03:59:42,446 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 03:59:42,446 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 03:59:42,446 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 03:59:42,728 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 03:59:42,741 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 03:59:42,744 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 03:59:42,746 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 03:59:42,746 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 03:59:42,747 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i.v+nlh-reducer.c [2019-11-07 03:59:42,818 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/667c283e9/a7210e6117b24898aafc3d6082529cfc/FLAG972f50a7b [2019-11-07 03:59:43,296 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 03:59:43,297 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i.v+nlh-reducer.c [2019-11-07 03:59:43,304 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/667c283e9/a7210e6117b24898aafc3d6082529cfc/FLAG972f50a7b [2019-11-07 03:59:43,723 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/667c283e9/a7210e6117b24898aafc3d6082529cfc [2019-11-07 03:59:43,732 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 03:59:43,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 03:59:43,735 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 03:59:43,735 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 03:59:43,739 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 03:59:43,740 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 03:59:43" (1/1) ... [2019-11-07 03:59:43,743 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@552ebbe1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:43, skipping insertion in model container [2019-11-07 03:59:43,743 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 03:59:43" (1/1) ... [2019-11-07 03:59:43,750 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 03:59:43,776 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 03:59:43,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 03:59:43,965 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 03:59:44,084 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 03:59:44,104 INFO L192 MainTranslator]: Completed translation [2019-11-07 03:59:44,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44 WrapperNode [2019-11-07 03:59:44,105 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 03:59:44,105 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 03:59:44,105 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 03:59:44,106 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 03:59:44,116 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,124 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,124 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,132 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,136 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... [2019-11-07 03:59:44,141 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 03:59:44,141 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 03:59:44,142 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 03:59:44,142 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 03:59:44,143 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 03:59:44,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 03:59:44,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 03:59:44,203 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 03:59:44,203 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 03:59:44,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 03:59:44,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 03:59:44,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-11-07 03:59:44,204 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 03:59:44,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 03:59:44,204 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 03:59:44,205 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 03:59:44,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 03:59:44,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 03:59:44,205 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 03:59:44,549 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 03:59:44,549 INFO L284 CfgBuilder]: Removed 0 assume(true) statements. [2019-11-07 03:59:44,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 03:59:44 BoogieIcfgContainer [2019-11-07 03:59:44,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 03:59:44,552 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 03:59:44,552 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 03:59:44,555 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 03:59:44,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 03:59:43" (1/3) ... [2019-11-07 03:59:44,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6214bc41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 03:59:44, skipping insertion in model container [2019-11-07 03:59:44,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:59:44" (2/3) ... [2019-11-07 03:59:44,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6214bc41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 03:59:44, skipping insertion in model container [2019-11-07 03:59:44,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 03:59:44" (3/3) ... [2019-11-07 03:59:44,558 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_4.i.v+nlh-reducer.c [2019-11-07 03:59:44,568 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 03:59:44,575 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2019-11-07 03:59:44,587 INFO L249 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2019-11-07 03:59:44,611 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 03:59:44,612 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 03:59:44,612 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 03:59:44,612 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 03:59:44,612 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 03:59:44,612 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 03:59:44,612 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 03:59:44,613 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 03:59:44,631 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2019-11-07 03:59:44,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 03:59:44,637 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:44,638 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:44,640 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:44,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:44,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1493056857, now seen corresponding path program 1 times [2019-11-07 03:59:44,656 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:44,656 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940121227] [2019-11-07 03:59:44,657 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:44,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:44,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:44,857 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940121227] [2019-11-07 03:59:44,858 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:59:44,858 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 03:59:44,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359104766] [2019-11-07 03:59:44,865 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 03:59:44,865 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:44,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 03:59:44,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 03:59:44,880 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2019-11-07 03:59:44,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:59:44,921 INFO L93 Difference]: Finished difference Result 50 states and 66 transitions. [2019-11-07 03:59:44,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 03:59:44,924 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 03:59:44,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:59:44,934 INFO L225 Difference]: With dead ends: 50 [2019-11-07 03:59:44,934 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 03:59:44,937 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 03:59:44,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 03:59:44,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-11-07 03:59:44,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-07 03:59:44,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2019-11-07 03:59:44,989 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 12 [2019-11-07 03:59:44,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:59:44,990 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2019-11-07 03:59:44,990 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 03:59:44,990 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2019-11-07 03:59:44,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 03:59:44,991 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:44,991 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:44,991 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:44,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:44,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1230815368, now seen corresponding path program 1 times [2019-11-07 03:59:44,992 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:44,993 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313218711] [2019-11-07 03:59:44,993 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:45,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:45,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:45,048 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313218711] [2019-11-07 03:59:45,049 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:59:45,049 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 03:59:45,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883984956] [2019-11-07 03:59:45,051 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 03:59:45,052 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:45,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 03:59:45,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 03:59:45,052 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 4 states. [2019-11-07 03:59:45,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:59:45,099 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2019-11-07 03:59:45,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 03:59:45,100 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-07 03:59:45,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:59:45,102 INFO L225 Difference]: With dead ends: 50 [2019-11-07 03:59:45,102 INFO L226 Difference]: Without dead ends: 48 [2019-11-07 03:59:45,105 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-07 03:59:45,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-07 03:59:45,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 32. [2019-11-07 03:59:45,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 03:59:45,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2019-11-07 03:59:45,114 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 13 [2019-11-07 03:59:45,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:59:45,115 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2019-11-07 03:59:45,115 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 03:59:45,115 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2019-11-07 03:59:45,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 03:59:45,116 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:45,117 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:45,117 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:45,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:45,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1294538317, now seen corresponding path program 1 times [2019-11-07 03:59:45,119 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:45,119 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441007388] [2019-11-07 03:59:45,119 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:45,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:45,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:45,204 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441007388] [2019-11-07 03:59:45,205 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:59:45,205 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 03:59:45,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510508939] [2019-11-07 03:59:45,206 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 03:59:45,206 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:45,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 03:59:45,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 03:59:45,207 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 3 states. [2019-11-07 03:59:45,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:59:45,274 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2019-11-07 03:59:45,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 03:59:45,276 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-07 03:59:45,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:59:45,277 INFO L225 Difference]: With dead ends: 59 [2019-11-07 03:59:45,277 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 03:59:45,278 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 03:59:45,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 03:59:45,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2019-11-07 03:59:45,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 03:59:45,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2019-11-07 03:59:45,285 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 13 [2019-11-07 03:59:45,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:59:45,285 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2019-11-07 03:59:45,286 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 03:59:45,286 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2019-11-07 03:59:45,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 03:59:45,286 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:45,287 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:45,287 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:45,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:45,288 INFO L82 PathProgramCache]: Analyzing trace with hash -442233424, now seen corresponding path program 1 times [2019-11-07 03:59:45,289 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:45,289 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714366056] [2019-11-07 03:59:45,289 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:45,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:45,337 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714366056] [2019-11-07 03:59:45,337 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:59:45,337 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 03:59:45,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631971900] [2019-11-07 03:59:45,338 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 03:59:45,338 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:45,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 03:59:45,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 03:59:45,339 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 3 states. [2019-11-07 03:59:45,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:59:45,394 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2019-11-07 03:59:45,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 03:59:45,395 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-11-07 03:59:45,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:59:45,396 INFO L225 Difference]: With dead ends: 53 [2019-11-07 03:59:45,396 INFO L226 Difference]: Without dead ends: 33 [2019-11-07 03:59:45,397 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 03:59:45,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-07 03:59:45,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2019-11-07 03:59:45,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-07 03:59:45,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-11-07 03:59:45,402 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 14 [2019-11-07 03:59:45,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:59:45,402 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-11-07 03:59:45,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 03:59:45,403 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-11-07 03:59:45,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 03:59:45,403 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:45,404 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:45,404 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:45,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:45,405 INFO L82 PathProgramCache]: Analyzing trace with hash -503898809, now seen corresponding path program 1 times [2019-11-07 03:59:45,405 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:45,405 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226091293] [2019-11-07 03:59:45,405 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:45,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:46,421 WARN L191 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 86 [2019-11-07 03:59:46,896 WARN L191 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 89 [2019-11-07 03:59:46,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:46,920 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226091293] [2019-11-07 03:59:46,920 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:59:46,921 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2019-11-07 03:59:46,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107608612] [2019-11-07 03:59:46,921 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-07 03:59:46,922 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:46,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-07 03:59:46,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2019-11-07 03:59:46,923 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 9 states. [2019-11-07 03:59:47,222 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 42 [2019-11-07 03:59:47,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:59:47,423 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2019-11-07 03:59:47,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-07 03:59:47,424 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2019-11-07 03:59:47,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:59:47,425 INFO L225 Difference]: With dead ends: 43 [2019-11-07 03:59:47,425 INFO L226 Difference]: Without dead ends: 28 [2019-11-07 03:59:47,426 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2019-11-07 03:59:47,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-07 03:59:47,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-07 03:59:47,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-07 03:59:47,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2019-11-07 03:59:47,431 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2019-11-07 03:59:47,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:59:47,432 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2019-11-07 03:59:47,432 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-07 03:59:47,432 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2019-11-07 03:59:47,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 03:59:47,433 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:47,433 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:47,433 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:47,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:47,434 INFO L82 PathProgramCache]: Analyzing trace with hash 907184126, now seen corresponding path program 1 times [2019-11-07 03:59:47,434 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:47,434 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524606756] [2019-11-07 03:59:47,434 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:47,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:47,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:47,515 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524606756] [2019-11-07 03:59:47,515 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:59:47,515 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-07 03:59:47,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103393302] [2019-11-07 03:59:47,517 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 03:59:47,517 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:47,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 03:59:47,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-11-07 03:59:47,519 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 6 states. [2019-11-07 03:59:47,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:59:47,587 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-11-07 03:59:47,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-07 03:59:47,587 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-11-07 03:59:47,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:59:47,588 INFO L225 Difference]: With dead ends: 41 [2019-11-07 03:59:47,588 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 03:59:47,589 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-11-07 03:59:47,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 03:59:47,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 26. [2019-11-07 03:59:47,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 03:59:47,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2019-11-07 03:59:47,600 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 20 [2019-11-07 03:59:47,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:59:47,601 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2019-11-07 03:59:47,602 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 03:59:47,602 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2019-11-07 03:59:47,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 03:59:47,605 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:59:47,606 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:59:47,606 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr2ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION, mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:59:47,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:59:47,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1084636737, now seen corresponding path program 1 times [2019-11-07 03:59:47,607 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:59:47,607 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126690852] [2019-11-07 03:59:47,607 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:59:47,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:47,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:47,870 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126690852] [2019-11-07 03:59:47,870 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101269731] [2019-11-07 03:59:47,870 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:59:47,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:59:47,950 INFO L256 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 03:59:47,961 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 03:59:48,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:48,034 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 03:59:49,191 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:59:49,192 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858531007] [2019-11-07 03:59:49,218 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 03:59:49,219 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 03:59:49,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 03:59:49,232 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 03:59:49,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 03:59:49,352 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 03:59:49,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 19 for LOIs [2019-11-07 03:59:49,772 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 03:59:50,040 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 61 [2019-11-07 03:59:50,625 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 46 [2019-11-07 03:59:50,786 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 46 [2019-11-07 03:59:52,990 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 48 [2019-11-07 03:59:55,264 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 52 [2019-11-07 03:59:55,425 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2019-11-07 03:59:55,699 WARN L191 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 65 [2019-11-07 03:59:56,006 WARN L191 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 70 [2019-11-07 03:59:56,588 WARN L191 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 73 [2019-11-07 03:59:56,941 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 60 [2019-11-07 03:59:56,943 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 03:59:56,943 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4, 17] total 26 [2019-11-07 03:59:56,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528607592] [2019-11-07 03:59:56,945 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 03:59:56,945 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:59:56,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 03:59:56,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=532, Unknown=1, NotChecked=0, Total=650 [2019-11-07 03:59:56,946 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 26 states. [2019-11-07 03:59:58,506 WARN L191 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 77 [2019-11-07 04:00:01,450 WARN L191 SmtUtils]: Spent 2.76 s on a formula simplification. DAG size of input: 104 DAG size of output: 94 [2019-11-07 04:00:07,958 WARN L191 SmtUtils]: Spent 6.31 s on a formula simplification that was a NOOP. DAG size: 26 [2019-11-07 04:00:09,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:00:09,108 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2019-11-07 04:00:09,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 04:00:09,108 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 21 [2019-11-07 04:00:09,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:00:09,109 INFO L225 Difference]: With dead ends: 38 [2019-11-07 04:00:09,109 INFO L226 Difference]: Without dead ends: 0 [2019-11-07 04:00:09,110 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=162, Invalid=767, Unknown=1, NotChecked=0, Total=930 [2019-11-07 04:00:09,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-07 04:00:09,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-07 04:00:09,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-07 04:00:09,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-07 04:00:09,111 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2019-11-07 04:00:09,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:00:09,111 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-07 04:00:09,111 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-07 04:00:09,111 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-07 04:00:09,111 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-07 04:00:09,312 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:00:09,318 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-11-07 04:00:26,624 WARN L191 SmtUtils]: Spent 17.19 s on a formula simplification. DAG size of input: 128 DAG size of output: 78 [2019-11-07 04:00:31,931 WARN L191 SmtUtils]: Spent 5.26 s on a formula simplification. DAG size of input: 133 DAG size of output: 82