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-tiling/nr2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:38:06,024 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:38:06,027 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:38:06,045 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:38:06,045 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:38:06,047 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:38:06,049 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:38:06,057 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:38:06,062 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:38:06,065 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:38:06,066 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:38:06,067 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:38:06,067 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:38:06,069 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:38:06,071 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:38:06,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:38:06,074 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:38:06,074 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:38:06,076 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:38:06,080 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:38:06,084 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:38:06,086 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:38:06,089 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:38:06,089 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:38:06,091 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:38:06,103 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:38:06,104 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:38:06,105 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:38:06,106 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 01:38:06,131 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:38:06,131 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:38:06,132 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:38:06,133 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:38:06,133 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:38:06,133 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:38:06,133 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:38:06,133 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:38:06,134 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:38:06,134 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:38:06,134 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:38:06,134 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:38:06,134 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:38:06,135 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:38:06,135 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:38:06,135 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:38:06,135 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:38:06,135 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:38:06,136 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:38:06,136 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:38:06,136 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:38:06,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:38:06,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:38:06,137 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:38:06,137 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:38:06,137 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:38:06,137 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:38:06,137 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:38:06,137 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 01:38:06,432 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:38:06,453 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:38:06,457 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:38:06,459 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:38:06,459 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:38:06,460 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/nr2.c [2019-10-15 01:38:06,533 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0d764789/77abb93db5094e8e88a2602fbd0b6507/FLAG91cf69f72 [2019-10-15 01:38:06,982 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:38:06,983 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/nr2.c [2019-10-15 01:38:06,989 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0d764789/77abb93db5094e8e88a2602fbd0b6507/FLAG91cf69f72 [2019-10-15 01:38:07,383 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0d764789/77abb93db5094e8e88a2602fbd0b6507 [2019-10-15 01:38:07,394 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:38:07,396 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:38:07,397 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:07,397 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:38:07,401 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:38:07,402 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,405 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75d79651 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07, skipping insertion in model container [2019-10-15 01:38:07,405 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,413 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:38:07,436 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:38:07,666 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:07,674 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:38:07,697 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:07,717 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:38:07,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07 WrapperNode [2019-10-15 01:38:07,717 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:07,718 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:38:07,718 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:38:07,718 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:38:07,817 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,824 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,825 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,833 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,839 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,841 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (1/1) ... [2019-10-15 01:38:07,843 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:38:07,843 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:38:07,843 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:38:07,843 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:38:07,846 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (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 01:38:07,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:38:07,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:38:07,896 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:38:07,896 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:38:07,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:38:07,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:38:07,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:38:07,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:38:07,897 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:38:07,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:38:07,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:38:07,898 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:38:07,898 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:38:07,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:38:07,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:38:08,262 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:38:08,263 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 01:38:08,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:08 BoogieIcfgContainer [2019-10-15 01:38:08,264 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:38:08,266 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:38:08,266 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:38:08,269 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:38:08,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:38:07" (1/3) ... [2019-10-15 01:38:08,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49b32c61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:08, skipping insertion in model container [2019-10-15 01:38:08,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:07" (2/3) ... [2019-10-15 01:38:08,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49b32c61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:08, skipping insertion in model container [2019-10-15 01:38:08,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:08" (3/3) ... [2019-10-15 01:38:08,272 INFO L109 eAbstractionObserver]: Analyzing ICFG nr2.c [2019-10-15 01:38:08,282 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:38:08,289 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:38:08,314 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:38:08,343 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:38:08,344 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:38:08,344 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:38:08,344 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:38:08,344 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:38:08,344 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:38:08,344 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:38:08,345 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:38:08,365 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-15 01:38:08,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:38:08,371 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:08,371 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:08,373 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:08,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:08,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1436172912, now seen corresponding path program 1 times [2019-10-15 01:38:08,384 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:08,385 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216145679] [2019-10-15 01:38:08,385 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:08,385 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:08,385 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:08,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:08,603 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 01:38:08,604 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216145679] [2019-10-15 01:38:08,605 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:08,605 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:38:08,605 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825657155] [2019-10-15 01:38:08,609 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:38:08,609 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:08,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:38:08,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:38:08,624 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-10-15 01:38:08,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:08,714 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2019-10-15 01:38:08,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:38:08,716 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-15 01:38:08,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:08,725 INFO L225 Difference]: With dead ends: 44 [2019-10-15 01:38:08,725 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:38:08,728 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 01:38:08,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:38:08,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-10-15 01:38:08,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-15 01:38:08,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-10-15 01:38:08,770 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2019-10-15 01:38:08,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:08,770 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-10-15 01:38:08,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:38:08,771 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-10-15 01:38:08,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:38:08,772 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:08,772 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:08,772 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:08,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:08,773 INFO L82 PathProgramCache]: Analyzing trace with hash -519328614, now seen corresponding path program 1 times [2019-10-15 01:38:08,773 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:08,774 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733948935] [2019-10-15 01:38:08,774 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:08,774 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:08,774 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:08,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:08,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:08,834 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733948935] [2019-10-15 01:38:08,834 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:08,834 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:38:08,834 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651371623] [2019-10-15 01:38:08,836 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:38:08,837 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:08,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:38:08,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:38:08,837 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2019-10-15 01:38:08,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:08,870 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-10-15 01:38:08,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:38:08,871 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-15 01:38:08,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:08,873 INFO L225 Difference]: With dead ends: 31 [2019-10-15 01:38:08,873 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:38:08,875 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 01:38:08,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:38:08,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:38:08,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:38:08,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-15 01:38:08,893 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-10-15 01:38:08,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:08,894 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-15 01:38:08,894 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:38:08,894 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-15 01:38:08,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:38:08,896 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:08,896 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:08,897 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:08,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:08,898 INFO L82 PathProgramCache]: Analyzing trace with hash 984169796, now seen corresponding path program 1 times [2019-10-15 01:38:08,899 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:08,899 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959966451] [2019-10-15 01:38:08,899 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:08,900 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:08,900 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:08,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:09,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:09,004 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959966451] [2019-10-15 01:38:09,004 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645024314] [2019-10-15 01:38:09,004 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 01:38:09,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:09,080 INFO L256 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:38:09,089 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:09,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:09,120 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:09,142 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1344332618] [2019-10-15 01:38:09,197 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:38:09,197 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:09,206 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:09,215 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:09,216 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:09,377 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:38:09,722 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,071 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,375 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,417 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,429 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,438 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,742 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,753 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,761 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:10,825 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:11,015 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 42 for LOIs [2019-10-15 01:38:11,027 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:11,034 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:11,520 WARN L191 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 44 [2019-10-15 01:38:11,671 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 23 [2019-10-15 01:38:11,980 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:11,981 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 12] total 16 [2019-10-15 01:38:11,981 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133114341] [2019-10-15 01:38:11,982 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-15 01:38:11,983 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:11,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-15 01:38:11,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2019-10-15 01:38:11,984 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 16 states. [2019-10-15 01:38:12,226 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 45 [2019-10-15 01:38:12,364 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 48 [2019-10-15 01:38:12,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:12,895 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2019-10-15 01:38:12,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:38:12,895 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2019-10-15 01:38:12,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:12,896 INFO L225 Difference]: With dead ends: 43 [2019-10-15 01:38:12,896 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:38:12,898 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:38:12,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:38:12,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 21. [2019-10-15 01:38:12,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:38:12,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-15 01:38:12,905 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2019-10-15 01:38:12,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:12,905 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-15 01:38:12,905 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-15 01:38:12,905 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-15 01:38:12,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:38:12,906 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:12,906 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:13,109 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:13,110 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:13,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:13,111 INFO L82 PathProgramCache]: Analyzing trace with hash 347980250, now seen corresponding path program 2 times [2019-10-15 01:38:13,112 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:13,112 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97844503] [2019-10-15 01:38:13,112 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:13,113 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:13,113 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:13,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:13,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:13,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97844503] [2019-10-15 01:38:13,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213907875] [2019-10-15 01:38:13,523 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 01:38:13,593 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:38:13,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:13,595 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-15 01:38:13,601 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:13,736 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:13,923 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:13,923 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:14,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:14,275 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [255323167] [2019-10-15 01:38:14,277 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:38:14,278 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:14,278 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:14,278 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:14,279 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:14,332 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:38:14,503 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:14,765 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:14,989 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,251 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,364 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,372 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,381 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,389 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,414 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:15,560 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 42 for LOIs [2019-10-15 01:38:15,569 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:15,573 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:16,631 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:16,632 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 10, 12] total 34 [2019-10-15 01:38:16,632 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458062306] [2019-10-15 01:38:16,633 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-15 01:38:16,633 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:16,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-15 01:38:16,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1000, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:38:16,634 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 34 states. [2019-10-15 01:38:17,071 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 54 [2019-10-15 01:38:17,388 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 70 [2019-10-15 01:38:18,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:18,852 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2019-10-15 01:38:18,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 01:38:18,853 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 17 [2019-10-15 01:38:18,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:18,856 INFO L225 Difference]: With dead ends: 47 [2019-10-15 01:38:18,856 INFO L226 Difference]: Without dead ends: 45 [2019-10-15 01:38:18,858 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=316, Invalid=2336, Unknown=0, NotChecked=0, Total=2652 [2019-10-15 01:38:18,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-15 01:38:18,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 27. [2019-10-15 01:38:18,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 01:38:18,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-10-15 01:38:18,871 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 17 [2019-10-15 01:38:18,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:18,872 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-10-15 01:38:18,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-15 01:38:18,872 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-10-15 01:38:18,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-15 01:38:18,873 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:18,873 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:19,086 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:19,087 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:19,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:19,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1233243831, now seen corresponding path program 1 times [2019-10-15 01:38:19,088 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:19,088 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567789063] [2019-10-15 01:38:19,089 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:19,089 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:19,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:19,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:19,329 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:19,330 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567789063] [2019-10-15 01:38:19,330 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674932408] [2019-10-15 01:38:19,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 01:38:19,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:19,416 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-15 01:38:19,418 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:19,501 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:21,711 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:21,711 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:25,964 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:25,965 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [59214466] [2019-10-15 01:38:25,967 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:38:25,967 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:25,968 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:25,968 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:25,968 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:26,000 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:38:26,100 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,308 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,513 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,607 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,618 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,628 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,638 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:26,659 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,732 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,789 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,796 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,802 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,810 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,817 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:27,929 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:27,968 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:27,972 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:28,720 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 44 [2019-10-15 01:38:28,974 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 23 [2019-10-15 01:38:29,358 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 26 [2019-10-15 01:38:29,897 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2019-10-15 01:38:30,107 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:30,108 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 12, 14] total 42 [2019-10-15 01:38:30,108 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82381180] [2019-10-15 01:38:30,109 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-10-15 01:38:30,109 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:30,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-10-15 01:38:30,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1543, Unknown=3, NotChecked=0, Total=1722 [2019-10-15 01:38:30,111 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 42 states. [2019-10-15 01:38:30,434 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 46 [2019-10-15 01:38:30,649 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 49 [2019-10-15 01:38:31,137 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 47 [2019-10-15 01:38:31,894 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2019-10-15 01:38:33,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:33,025 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-10-15 01:38:33,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-15 01:38:33,026 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 24 [2019-10-15 01:38:33,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:33,027 INFO L225 Difference]: With dead ends: 42 [2019-10-15 01:38:33,027 INFO L226 Difference]: Without dead ends: 40 [2019-10-15 01:38:33,029 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1137 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=458, Invalid=3321, Unknown=3, NotChecked=0, Total=3782 [2019-10-15 01:38:33,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-15 01:38:33,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2019-10-15 01:38:33,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:38:33,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-15 01:38:33,040 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 24 [2019-10-15 01:38:33,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:33,040 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-15 01:38:33,040 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-10-15 01:38:33,040 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-15 01:38:33,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-15 01:38:33,042 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:33,042 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:33,246 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:33,247 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:33,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:33,248 INFO L82 PathProgramCache]: Analyzing trace with hash 733740858, now seen corresponding path program 2 times [2019-10-15 01:38:33,248 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:33,248 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422659057] [2019-10-15 01:38:33,249 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:33,249 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:33,249 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:33,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:33,472 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:38:33,473 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422659057] [2019-10-15 01:38:33,473 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884227707] [2019-10-15 01:38:33,473 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 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 01:38:33,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:38:33,568 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:33,569 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 01:38:33,571 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:33,724 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:38:33,724 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:33,810 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:38:33,810 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2078347892] [2019-10-15 01:38:33,812 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:38:33,812 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:33,813 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:33,813 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:33,813 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:33,838 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:38:33,945 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:34,173 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:34,197 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:34,207 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:34,216 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:34,365 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,438 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,444 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,450 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,473 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,540 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,557 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,564 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,581 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,588 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:35,702 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:35,734 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:35,740 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:36,518 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 26 [2019-10-15 01:38:36,960 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:36,961 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 14] total 33 [2019-10-15 01:38:36,961 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41032463] [2019-10-15 01:38:36,963 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-15 01:38:36,963 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:36,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-15 01:38:36,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2019-10-15 01:38:36,964 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 33 states. [2019-10-15 01:38:37,219 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2019-10-15 01:38:37,371 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2019-10-15 01:38:37,986 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 38 [2019-10-15 01:38:38,587 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 36 [2019-10-15 01:38:39,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:39,362 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2019-10-15 01:38:39,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-15 01:38:39,363 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 31 [2019-10-15 01:38:39,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:39,364 INFO L225 Difference]: With dead ends: 65 [2019-10-15 01:38:39,364 INFO L226 Difference]: Without dead ends: 41 [2019-10-15 01:38:39,366 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 933 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=422, Invalid=2658, Unknown=0, NotChecked=0, Total=3080 [2019-10-15 01:38:39,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-15 01:38:39,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 36. [2019-10-15 01:38:39,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:38:39,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-10-15 01:38:39,378 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 31 [2019-10-15 01:38:39,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:39,378 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-10-15 01:38:39,378 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-15 01:38:39,378 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-10-15 01:38:39,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-15 01:38:39,379 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:39,379 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:39,583 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:39,584 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:39,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:39,585 INFO L82 PathProgramCache]: Analyzing trace with hash -858045180, now seen corresponding path program 3 times [2019-10-15 01:38:39,585 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:39,585 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951178824] [2019-10-15 01:38:39,585 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:39,586 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:39,586 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:39,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:39,859 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:38:39,859 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951178824] [2019-10-15 01:38:39,859 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473735359] [2019-10-15 01:38:39,859 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 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 01:38:39,981 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:38:39,982 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:39,983 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-15 01:38:39,988 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:40,152 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:40,536 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:38:40,536 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:41,062 WARN L191 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 23 [2019-10-15 01:38:41,162 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:38:41,162 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053867156] [2019-10-15 01:38:41,163 INFO L162 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-10-15 01:38:41,163 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:41,164 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:41,164 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:41,164 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:41,185 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:38:41,255 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,404 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,553 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,607 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,616 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,625 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,633 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:41,660 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,546 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,562 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,567 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,572 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,623 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,643 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,651 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,657 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,672 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:38:42,761 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2019-10-15 01:38:42,798 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:38:42,801 INFO L183 IcfgInterpreter]: Interpretation finished