java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-crafted/zero_sum_const4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:30:59,421 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:30:59,424 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:30:59,442 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:30:59,443 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:30:59,445 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:30:59,447 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:30:59,459 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:30:59,461 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:30:59,464 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:30:59,465 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:30:59,467 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:30:59,467 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:30:59,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:30:59,473 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:30:59,475 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:30:59,476 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:30:59,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:30:59,480 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:30:59,486 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:30:59,488 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:30:59,489 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:30:59,490 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:30:59,492 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:30:59,495 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:30:59,507 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:30:59,508 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:30:59,509 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:30:59,510 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 01:30:59,524 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:30:59,524 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:30:59,526 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:30:59,526 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:30:59,526 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:30:59,526 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:30:59,527 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:30:59,527 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:30:59,527 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:30:59,527 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:30:59,527 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:30:59,528 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:30:59,528 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:30:59,528 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:30:59,528 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:30:59,529 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:30:59,529 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:30:59,529 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:30:59,529 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:30:59,529 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:30:59,530 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:30:59,530 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:30:59,530 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:30:59,530 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:30:59,531 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:30:59,531 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:30:59,531 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:30:59,531 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:30:59,531 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 01:30:59,825 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:30:59,838 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:30:59,842 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:30:59,843 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:30:59,844 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:30:59,845 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const4.c [2019-10-15 01:30:59,912 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d76d98128/25337c2a9f82481a8fd8bb53f630df76/FLAG946059778 [2019-10-15 01:31:00,395 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:31:00,397 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const4.c [2019-10-15 01:31:00,407 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d76d98128/25337c2a9f82481a8fd8bb53f630df76/FLAG946059778 [2019-10-15 01:31:00,794 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d76d98128/25337c2a9f82481a8fd8bb53f630df76 [2019-10-15 01:31:00,805 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:31:00,806 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:31:00,807 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:00,808 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:31:00,811 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:31:00,812 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,815 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ac258e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:00, skipping insertion in model container [2019-10-15 01:31:00,815 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:00" (1/1) ... [2019-10-15 01:31:00,823 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:31:00,842 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:31:01,046 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:01,059 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:31:01,160 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:01,183 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:31:01,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01 WrapperNode [2019-10-15 01:31:01,183 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:01,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:31:01,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:31:01,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:31:01,195 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,195 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,203 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,203 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,213 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,221 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,223 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... [2019-10-15 01:31:01,226 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:31:01,227 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:31:01,227 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:31:01,227 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:31:01,228 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:31:01,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:31:01,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:31:01,292 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:31:01,293 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:31:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:31:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:31:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:31:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-10-15 01:31:01,293 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 01:31:01,294 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:31:01,294 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 01:31:01,294 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:31:01,294 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:31:01,294 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:31:01,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:31:01,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:31:01,801 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:31:01,802 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-10-15 01:31:01,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:01 BoogieIcfgContainer [2019-10-15 01:31:01,803 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:31:01,805 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:31:01,805 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:31:01,808 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:31:01,808 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:31:00" (1/3) ... [2019-10-15 01:31:01,809 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e6a936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:01, skipping insertion in model container [2019-10-15 01:31:01,809 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:01" (2/3) ... [2019-10-15 01:31:01,810 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e6a936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:01, skipping insertion in model container [2019-10-15 01:31:01,810 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:01" (3/3) ... [2019-10-15 01:31:01,812 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const4.c [2019-10-15 01:31:01,822 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:31:01,830 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:31:01,842 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:31:01,864 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:31:01,864 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:31:01,864 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:31:01,864 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:31:01,865 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:31:01,865 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:31:01,865 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:31:01,865 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:31:01,880 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-10-15 01:31:01,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-15 01:31:01,885 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:01,886 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:01,888 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:01,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:01,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1007897624, now seen corresponding path program 1 times [2019-10-15 01:31:01,900 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:01,901 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970711725] [2019-10-15 01:31:01,901 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,902 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:01,902 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:02,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:02,127 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970711725] [2019-10-15 01:31:02,128 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:02,129 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:31:02,130 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442992843] [2019-10-15 01:31:02,134 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:31:02,134 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:02,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:31:02,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:31:02,148 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2019-10-15 01:31:02,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:02,277 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2019-10-15 01:31:02,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:31:02,279 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2019-10-15 01:31:02,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:02,290 INFO L225 Difference]: With dead ends: 49 [2019-10-15 01:31:02,291 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 01:31:02,294 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:31:02,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 01:31:02,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-15 01:31:02,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:31:02,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 43 transitions. [2019-10-15 01:31:02,339 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 43 transitions. Word has length 19 [2019-10-15 01:31:02,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:02,340 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 43 transitions. [2019-10-15 01:31:02,340 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:31:02,343 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 43 transitions. [2019-10-15 01:31:02,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:31:02,344 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:02,344 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:02,345 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:02,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:02,347 INFO L82 PathProgramCache]: Analyzing trace with hash 229580911, now seen corresponding path program 1 times [2019-10-15 01:31:02,347 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:02,348 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916125477] [2019-10-15 01:31:02,348 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:02,348 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:02,348 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:02,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:02,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916125477] [2019-10-15 01:31:02,463 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:02,463 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:31:02,463 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090277661] [2019-10-15 01:31:02,465 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:31:02,465 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:02,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:31:02,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:02,466 INFO L87 Difference]: Start difference. First operand 28 states and 43 transitions. Second operand 3 states. [2019-10-15 01:31:02,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:02,516 INFO L93 Difference]: Finished difference Result 50 states and 80 transitions. [2019-10-15 01:31:02,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:31:02,517 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-10-15 01:31:02,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:02,518 INFO L225 Difference]: With dead ends: 50 [2019-10-15 01:31:02,518 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:31:02,520 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:02,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:31:02,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:31:02,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:31:02,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 44 transitions. [2019-10-15 01:31:02,528 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 44 transitions. Word has length 20 [2019-10-15 01:31:02,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:02,528 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 44 transitions. [2019-10-15 01:31:02,529 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:31:02,529 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 44 transitions. [2019-10-15 01:31:02,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:31:02,530 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:02,530 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:02,531 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:02,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:02,531 INFO L82 PathProgramCache]: Analyzing trace with hash 269324722, now seen corresponding path program 1 times [2019-10-15 01:31:02,531 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:02,532 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877274945] [2019-10-15 01:31:02,532 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:02,532 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:02,532 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:02,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:31:02,605 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877274945] [2019-10-15 01:31:02,605 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:02,606 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:31:02,606 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441236089] [2019-10-15 01:31:02,606 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:31:02,607 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:02,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:31:02,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:02,608 INFO L87 Difference]: Start difference. First operand 29 states and 44 transitions. Second operand 4 states. [2019-10-15 01:31:02,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:02,713 INFO L93 Difference]: Finished difference Result 48 states and 76 transitions. [2019-10-15 01:31:02,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:31:02,714 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2019-10-15 01:31:02,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:02,715 INFO L225 Difference]: With dead ends: 48 [2019-10-15 01:31:02,715 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:31:02,716 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:02,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:31:02,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:31:02,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:31:02,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2019-10-15 01:31:02,743 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 21 [2019-10-15 01:31:02,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:02,744 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2019-10-15 01:31:02,744 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:31:02,744 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2019-10-15 01:31:02,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:31:02,745 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:02,745 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:02,745 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:02,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:02,746 INFO L82 PathProgramCache]: Analyzing trace with hash -2044994938, now seen corresponding path program 1 times [2019-10-15 01:31:02,746 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:02,747 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193375233] [2019-10-15 01:31:02,747 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:02,747 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:02,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:02,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,852 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:31:02,852 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193375233] [2019-10-15 01:31:02,853 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429780319] [2019-10-15 01:31:02,853 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:02,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:02,911 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:02,918 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:02,971 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:31:02,972 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:03,004 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:31:03,004 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1676032437] [2019-10-15 01:31:03,030 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:03,030 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:03,036 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:03,042 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:03,043 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:03,247 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:05,017 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:05,073 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:05,079 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:05,595 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:06,026 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 21 [2019-10-15 01:31:06,029 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:06,029 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:31:06,029 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136394021] [2019-10-15 01:31:06,031 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:31:06,032 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:06,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:31:06,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:31:06,035 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 18 states. [2019-10-15 01:31:06,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:06,795 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2019-10-15 01:31:06,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:31:06,796 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 28 [2019-10-15 01:31:06,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:06,797 INFO L225 Difference]: With dead ends: 51 [2019-10-15 01:31:06,797 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 01:31:06,798 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:31:06,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 01:31:06,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-10-15 01:31:06,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 01:31:06,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2019-10-15 01:31:06,814 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 28 [2019-10-15 01:31:06,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:06,815 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2019-10-15 01:31:06,815 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:31:06,815 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2019-10-15 01:31:06,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:31:06,817 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:06,817 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:07,029 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:07,030 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:07,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:07,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1298290889, now seen corresponding path program 2 times [2019-10-15 01:31:07,031 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:07,032 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337759344] [2019-10-15 01:31:07,032 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:07,032 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:07,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:07,130 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:07,130 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337759344] [2019-10-15 01:31:07,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376893947] [2019-10-15 01:31:07,131 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:07,206 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:31:07,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:07,208 INFO L256 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:07,211 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:07,237 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:07,238 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:07,265 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:07,265 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885830841] [2019-10-15 01:31:07,269 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:07,269 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:07,270 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:07,271 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:07,271 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:07,318 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:08,284 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:08,314 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:08,319 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:09,160 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 21 [2019-10-15 01:31:09,163 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:09,163 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-10-15 01:31:09,163 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393191718] [2019-10-15 01:31:09,165 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:31:09,165 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:09,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:31:09,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:31:09,170 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 19 states. [2019-10-15 01:31:10,105 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 34 [2019-10-15 01:31:10,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:10,177 INFO L93 Difference]: Finished difference Result 57 states and 79 transitions. [2019-10-15 01:31:10,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:31:10,178 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 29 [2019-10-15 01:31:10,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:10,179 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:31:10,180 INFO L226 Difference]: Without dead ends: 38 [2019-10-15 01:31:10,181 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:31:10,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-15 01:31:10,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-10-15 01:31:10,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-15 01:31:10,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2019-10-15 01:31:10,189 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 29 [2019-10-15 01:31:10,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:10,189 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2019-10-15 01:31:10,190 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:31:10,190 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2019-10-15 01:31:10,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:31:10,191 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:10,191 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:10,394 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:10,395 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:10,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:10,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1705994344, now seen corresponding path program 3 times [2019-10-15 01:31:10,396 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:10,396 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927275418] [2019-10-15 01:31:10,396 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:10,397 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:10,397 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:10,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:11,430 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:11,431 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927275418] [2019-10-15 01:31:11,431 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148120954] [2019-10-15 01:31:11,431 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:11,534 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:11,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:11,536 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 77 conjunts are in the unsatisfiable core [2019-10-15 01:31:11,540 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:11,859 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:11,860 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:12,243 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:12,244 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291446434] [2019-10-15 01:31:12,248 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:12,248 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:12,249 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:12,249 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:12,249 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:12,284 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:13,255 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:13,285 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:13,290 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:13,888 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:14,378 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:14,379 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 10, 11] total 42 [2019-10-15 01:31:14,379 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157262563] [2019-10-15 01:31:14,381 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-10-15 01:31:14,381 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:14,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-10-15 01:31:14,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1578, Unknown=0, NotChecked=0, Total=1722 [2019-10-15 01:31:14,383 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 42 states. [2019-10-15 01:31:16,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:16,450 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2019-10-15 01:31:16,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-15 01:31:16,450 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 37 [2019-10-15 01:31:16,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:16,451 INFO L225 Difference]: With dead ends: 65 [2019-10-15 01:31:16,451 INFO L226 Difference]: Without dead ends: 60 [2019-10-15 01:31:16,454 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 74 SyntacticMatches, 27 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=262, Invalid=2818, Unknown=0, NotChecked=0, Total=3080 [2019-10-15 01:31:16,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-15 01:31:16,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-10-15 01:31:16,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-15 01:31:16,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2019-10-15 01:31:16,467 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 37 [2019-10-15 01:31:16,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:16,468 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2019-10-15 01:31:16,468 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-10-15 01:31:16,468 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2019-10-15 01:31:16,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-15 01:31:16,469 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:16,469 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:16,678 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:16,679 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:16,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:16,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1727052881, now seen corresponding path program 4 times [2019-10-15 01:31:16,679 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:16,680 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947086461] [2019-10-15 01:31:16,680 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:16,680 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:16,680 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:16,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:16,759 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:31:16,759 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947086461] [2019-10-15 01:31:16,760 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822474003] [2019-10-15 01:31:16,760 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:16,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:16,857 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:16,859 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:16,918 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:31:16,918 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:16,961 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:31:16,961 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1614527480] [2019-10-15 01:31:16,965 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:16,965 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:16,967 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:16,967 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:16,967 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:17,001 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:17,811 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:17,839 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:17,843 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:18,673 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 21 [2019-10-15 01:31:18,674 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:18,674 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-10-15 01:31:18,674 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065698077] [2019-10-15 01:31:18,676 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:31:18,676 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:18,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:31:18,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:31:18,677 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand 24 states. [2019-10-15 01:31:19,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:19,972 INFO L93 Difference]: Finished difference Result 118 states and 155 transitions. [2019-10-15 01:31:19,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:31:19,972 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 38 [2019-10-15 01:31:19,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:19,976 INFO L225 Difference]: With dead ends: 118 [2019-10-15 01:31:19,977 INFO L226 Difference]: Without dead ends: 67 [2019-10-15 01:31:19,978 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:31:19,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-15 01:31:19,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2019-10-15 01:31:19,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-15 01:31:19,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2019-10-15 01:31:19,989 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 38 [2019-10-15 01:31:19,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:19,990 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2019-10-15 01:31:19,990 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:31:19,990 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2019-10-15 01:31:19,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-15 01:31:19,991 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:19,991 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:20,198 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:20,198 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:20,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:20,199 INFO L82 PathProgramCache]: Analyzing trace with hash 145426994, now seen corresponding path program 5 times [2019-10-15 01:31:20,200 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:20,200 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469928788] [2019-10-15 01:31:20,200 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:20,200 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:20,201 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:20,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:20,281 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:31:20,281 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469928788] [2019-10-15 01:31:20,281 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117849293] [2019-10-15 01:31:20,282 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:20,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:31:20,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:20,400 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:20,402 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:20,448 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:31:20,449 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:20,485 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:31:20,485 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2717165] [2019-10-15 01:31:20,487 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:20,487 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:20,488 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:20,488 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:20,488 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:20,517 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:21,258 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:21,290 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:21,293 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:22,095 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:22,095 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-10-15 01:31:22,096 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702789625] [2019-10-15 01:31:22,097 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-15 01:31:22,097 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:22,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-15 01:31:22,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:31:22,098 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 25 states. [2019-10-15 01:31:23,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:23,462 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2019-10-15 01:31:23,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:31:23,463 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 39 [2019-10-15 01:31:23,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:23,464 INFO L225 Difference]: With dead ends: 70 [2019-10-15 01:31:23,464 INFO L226 Difference]: Without dead ends: 47 [2019-10-15 01:31:23,466 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 96 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:31:23,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-15 01:31:23,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-10-15 01:31:23,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-15 01:31:23,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2019-10-15 01:31:23,475 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 39 [2019-10-15 01:31:23,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:23,476 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2019-10-15 01:31:23,476 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-15 01:31:23,476 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2019-10-15 01:31:23,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-15 01:31:23,477 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:23,478 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:23,681 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:23,682 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:23,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:23,683 INFO L82 PathProgramCache]: Analyzing trace with hash -119252730, now seen corresponding path program 6 times [2019-10-15 01:31:23,683 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:23,683 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411931971] [2019-10-15 01:31:23,683 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:23,684 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:23,684 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:23,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:25,783 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 56 [2019-10-15 01:31:25,937 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 42 [2019-10-15 01:31:26,074 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 38 [2019-10-15 01:31:26,972 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:26,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411931971] [2019-10-15 01:31:26,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814485780] [2019-10-15 01:31:26,972 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:27,114 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:27,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:27,117 WARN L254 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 111 conjunts are in the unsatisfiable core [2019-10-15 01:31:27,121 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:27,779 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:27,779 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:28,317 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:28,317 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2021707500] [2019-10-15 01:31:28,318 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:28,319 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:28,319 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:28,319 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:28,319 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:28,344 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:29,158 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:29,177 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:29,180 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:30,411 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:30,411 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 16, 12, 11] total 62 [2019-10-15 01:31:30,411 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017217048] [2019-10-15 01:31:30,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-10-15 01:31:30,413 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:30,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-10-15 01:31:30,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=3465, Unknown=0, NotChecked=0, Total=3782 [2019-10-15 01:31:30,415 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 62 states. [2019-10-15 01:31:31,308 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 54 [2019-10-15 01:31:31,897 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 51 [2019-10-15 01:31:32,275 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 56 [2019-10-15 01:31:32,889 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 56 [2019-10-15 01:31:33,393 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 50 [2019-10-15 01:31:33,746 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 59 [2019-10-15 01:31:35,477 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 46 [2019-10-15 01:31:36,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:36,134 INFO L93 Difference]: Finished difference Result 105 states and 131 transitions. [2019-10-15 01:31:36,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-15 01:31:36,134 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 46 [2019-10-15 01:31:36,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:36,137 INFO L225 Difference]: With dead ends: 105 [2019-10-15 01:31:36,137 INFO L226 Difference]: Without dead ends: 100 [2019-10-15 01:31:36,140 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 90 SyntacticMatches, 28 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3456 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=677, Invalid=6979, Unknown=0, NotChecked=0, Total=7656 [2019-10-15 01:31:36,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-10-15 01:31:36,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 73. [2019-10-15 01:31:36,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-15 01:31:36,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2019-10-15 01:31:36,160 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 46 [2019-10-15 01:31:36,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:36,161 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2019-10-15 01:31:36,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-10-15 01:31:36,161 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2019-10-15 01:31:36,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-15 01:31:36,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:36,162 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:36,374 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:36,375 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:36,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:36,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1270554803, now seen corresponding path program 7 times [2019-10-15 01:31:36,376 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:36,376 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295683411] [2019-10-15 01:31:36,376 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:36,377 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:36,377 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:36,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:36,496 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:31:36,496 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295683411] [2019-10-15 01:31:36,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572889768] [2019-10-15 01:31:36,497 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:36,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:36,713 INFO L256 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:31:36,729 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:36,818 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:31:36,819 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:36,882 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:31:36,882 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1414305787] [2019-10-15 01:31:36,884 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:31:36,884 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:36,884 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:36,885 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:36,885 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:36,911 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:37,822 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:37,870 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:37,875 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:38,592 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:38,991 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2019-10-15 01:31:39,132 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:39,132 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 11] total 27 [2019-10-15 01:31:39,133 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764821609] [2019-10-15 01:31:39,133 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-15 01:31:39,133 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:39,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-15 01:31:39,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:31:39,134 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 27 states.