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-multidimensional/min-2-u.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:37:19,763 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:37:19,765 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:37:19,783 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:37:19,784 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:37:19,786 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:37:19,788 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:37:19,800 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:37:19,802 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:37:19,805 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:37:19,806 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:37:19,807 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:37:19,807 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:37:19,810 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:37:19,813 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:37:19,815 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:37:19,816 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:37:19,819 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:37:19,821 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:37:19,828 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:37:19,833 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:37:19,836 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:37:19,839 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:37:19,840 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:37:19,843 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:37:19,853 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:37:19,854 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:37:19,855 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:37:19,856 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 01:37:19,875 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:37:19,875 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:37:19,877 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:37:19,877 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:37:19,877 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:37:19,878 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:37:19,878 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:37:19,878 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:37:19,878 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:37:19,879 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:37:19,880 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:37:19,880 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:37:19,880 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:37:19,880 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:37:19,881 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:37:19,881 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:37:19,881 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:37:19,881 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:37:19,882 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:37:19,882 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:37:19,882 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:37:19,882 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:37:19,882 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:37:19,883 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:37:19,883 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:37:19,883 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:37:19,883 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:37:19,883 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:37:19,884 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 01:37:20,169 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:37:20,184 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:37:20,188 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:37:20,189 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:37:20,190 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:37:20,190 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-multidimensional/min-2-u.c [2019-10-15 01:37:20,263 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/382d08d5f/ba37d08702d6400c8d66dbbd89623d02/FLAGfd597be91 [2019-10-15 01:37:20,749 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:37:20,750 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-multidimensional/min-2-u.c [2019-10-15 01:37:20,756 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/382d08d5f/ba37d08702d6400c8d66dbbd89623d02/FLAGfd597be91 [2019-10-15 01:37:21,125 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/382d08d5f/ba37d08702d6400c8d66dbbd89623d02 [2019-10-15 01:37:21,136 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:37:21,140 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:37:21,141 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:37:21,141 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:37:21,145 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:37:21,146 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,149 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32ed2b26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21, skipping insertion in model container [2019-10-15 01:37:21,149 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,158 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:37:21,178 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:37:21,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:37:21,434 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:37:21,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:37:21,599 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:37:21,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21 WrapperNode [2019-10-15 01:37:21,600 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:37:21,601 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:37:21,601 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:37:21,601 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:37:21,616 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,617 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,626 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,627 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,637 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,649 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,656 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (1/1) ... [2019-10-15 01:37:21,659 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:37:21,659 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:37:21,659 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:37:21,659 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:37:21,662 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (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 01:37:21,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:37:21,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:37:21,725 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:37:21,725 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:37:21,726 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:37:21,726 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:37:21,726 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:37:21,726 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:37:21,726 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:37:21,726 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:37:21,727 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:37:21,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:37:21,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:37:21,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:37:22,143 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:37:22,143 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-15 01:37:22,144 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:37:22 BoogieIcfgContainer [2019-10-15 01:37:22,145 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:37:22,146 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:37:22,146 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:37:22,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:37:22,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:37:21" (1/3) ... [2019-10-15 01:37:22,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74eb6370 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:37:22, skipping insertion in model container [2019-10-15 01:37:22,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:21" (2/3) ... [2019-10-15 01:37:22,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74eb6370 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:37:22, skipping insertion in model container [2019-10-15 01:37:22,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:37:22" (3/3) ... [2019-10-15 01:37:22,152 INFO L109 eAbstractionObserver]: Analyzing ICFG min-2-u.c [2019-10-15 01:37:22,161 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:37:22,168 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:37:22,180 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:37:22,211 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:37:22,211 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:37:22,211 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:37:22,211 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:37:22,212 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:37:22,212 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:37:22,212 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:37:22,212 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:37:22,225 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 01:37:22,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:37:22,230 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:22,230 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:22,234 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:22,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:22,239 INFO L82 PathProgramCache]: Analyzing trace with hash -1121179117, now seen corresponding path program 1 times [2019-10-15 01:37:22,248 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:22,248 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019389783] [2019-10-15 01:37:22,249 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:22,249 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:22,249 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:22,322 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:22,323 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1133913684] [2019-10-15 01:37:22,323 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 01:37:22,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:22,375 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:37:22,382 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:22,434 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 01:37:22,434 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:22,462 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 01:37:22,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019389783] [2019-10-15 01:37:22,463 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:22,463 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133913684] [2019-10-15 01:37:22,464 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:37:22,464 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-10-15 01:37:22,464 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213795176] [2019-10-15 01:37:22,469 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:37:22,470 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:22,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:37:22,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:37:22,487 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-10-15 01:37:22,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:22,563 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2019-10-15 01:37:22,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:37:22,565 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-15 01:37:22,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:22,574 INFO L225 Difference]: With dead ends: 40 [2019-10-15 01:37:22,575 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 01:37:22,578 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 23 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 01:37:22,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 01:37:22,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 01:37:22,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:37:22,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2019-10-15 01:37:22,618 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 13 [2019-10-15 01:37:22,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:22,619 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2019-10-15 01:37:22,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:37:22,620 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2019-10-15 01:37:22,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:37:22,621 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:22,621 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:22,824 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:22,825 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:22,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:22,827 INFO L82 PathProgramCache]: Analyzing trace with hash 343234267, now seen corresponding path program 1 times [2019-10-15 01:37:22,827 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:22,827 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563761145] [2019-10-15 01:37:22,828 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:22,828 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:22,828 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:22,844 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:22,845 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1205046818] [2019-10-15 01:37:22,845 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 01:37:22,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:22,907 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:37:22,912 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:22,946 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:37:22,946 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:22,972 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:37:22,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563761145] [2019-10-15 01:37:22,972 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:22,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205046818] [2019-10-15 01:37:22,973 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:37:22,973 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-10-15 01:37:22,973 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307435237] [2019-10-15 01:37:22,975 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:37:22,975 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:22,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:37:22,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:37:22,976 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 6 states. [2019-10-15 01:37:23,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:23,113 INFO L93 Difference]: Finished difference Result 49 states and 70 transitions. [2019-10-15 01:37:23,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:37:23,114 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-15 01:37:23,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:23,117 INFO L225 Difference]: With dead ends: 49 [2019-10-15 01:37:23,118 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:37:23,119 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-10-15 01:37:23,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:37:23,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-15 01:37:23,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:37:23,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-10-15 01:37:23,132 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 17 [2019-10-15 01:37:23,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:23,133 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-10-15 01:37:23,133 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:37:23,133 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-10-15 01:37:23,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:37:23,134 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:23,135 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:23,338 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:23,339 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:23,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:23,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1084120933, now seen corresponding path program 1 times [2019-10-15 01:37:23,340 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:23,341 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016419674] [2019-10-15 01:37:23,341 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:23,342 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:23,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:23,351 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:23,352 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1052059720] [2019-10-15 01:37:23,352 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 01:37:23,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:23,423 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:37:23,429 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:23,480 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:37:23,480 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:23,527 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:37:23,527 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016419674] [2019-10-15 01:37:23,527 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:23,527 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052059720] [2019-10-15 01:37:23,528 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1208672765] [2019-10-15 01:37:23,554 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:37:23,554 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:23,562 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:23,569 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:23,570 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:23,722 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:24,238 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2019-10-15 01:37:24,244 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:24,250 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:24,494 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 45 [2019-10-15 01:37:24,634 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:37:24,634 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 6] total 18 [2019-10-15 01:37:24,634 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960041098] [2019-10-15 01:37:24,635 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-15 01:37:24,636 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:24,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-15 01:37:24,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:37:24,637 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 10 states. [2019-10-15 01:37:24,840 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 46 [2019-10-15 01:37:25,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:25,079 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2019-10-15 01:37:25,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-15 01:37:25,079 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2019-10-15 01:37:25,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:25,080 INFO L225 Difference]: With dead ends: 50 [2019-10-15 01:37:25,081 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 01:37:25,082 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2019-10-15 01:37:25,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 01:37:25,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2019-10-15 01:37:25,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:37:25,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2019-10-15 01:37:25,094 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 21 [2019-10-15 01:37:25,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:25,095 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2019-10-15 01:37:25,095 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-15 01:37:25,095 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2019-10-15 01:37:25,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-15 01:37:25,096 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:25,097 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:25,304 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:25,305 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:25,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:25,305 INFO L82 PathProgramCache]: Analyzing trace with hash 207754054, now seen corresponding path program 1 times [2019-10-15 01:37:25,306 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:25,306 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398555926] [2019-10-15 01:37:25,306 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:25,306 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:25,306 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:25,316 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:25,317 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1388153786] [2019-10-15 01:37:25,317 INFO L94 rtionOrderModulation]: Keeping assertion order 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 01:37:25,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:25,375 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:37:25,377 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:25,411 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:37:25,411 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:37:25,459 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398555926] [2019-10-15 01:37:25,459 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:25,459 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388153786] [2019-10-15 01:37:25,460 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119152123] [2019-10-15 01:37:25,462 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:25,462 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:25,463 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:25,463 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:25,464 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:25,499 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:26,077 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:37:26,113 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:26,120 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:26,721 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:26,722 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 14] total 24 [2019-10-15 01:37:26,722 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421174581] [2019-10-15 01:37:26,723 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:37:26,723 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:26,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:37:26,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:37:26,724 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 24 states. [2019-10-15 01:37:27,474 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 54 [2019-10-15 01:37:28,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:28,252 INFO L93 Difference]: Finished difference Result 86 states and 120 transitions. [2019-10-15 01:37:28,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-15 01:37:28,253 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 25 [2019-10-15 01:37:28,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:28,254 INFO L225 Difference]: With dead ends: 86 [2019-10-15 01:37:28,254 INFO L226 Difference]: Without dead ends: 62 [2019-10-15 01:37:28,255 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=316, Invalid=1244, Unknown=0, NotChecked=0, Total=1560 [2019-10-15 01:37:28,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-15 01:37:28,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 57. [2019-10-15 01:37:28,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-15 01:37:28,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2019-10-15 01:37:28,272 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 25 [2019-10-15 01:37:28,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:28,272 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2019-10-15 01:37:28,272 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:37:28,272 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2019-10-15 01:37:28,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:37:28,273 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:28,274 INFO L380 BasicCegarLoop]: trace histogram [12, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:28,478 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:28,478 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:28,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:28,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1166771462, now seen corresponding path program 2 times [2019-10-15 01:37:28,479 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:28,479 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119564931] [2019-10-15 01:37:28,479 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:28,479 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:28,479 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:28,487 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:28,488 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [774425956] [2019-10-15 01:37:28,488 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 01:37:28,574 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:37:28,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:37:28,575 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:37:28,581 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:28,612 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-10-15 01:37:28,612 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:28,650 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-10-15 01:37:28,650 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119564931] [2019-10-15 01:37:28,650 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:28,650 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774425956] [2019-10-15 01:37:28,651 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1629630606] [2019-10-15 01:37:28,654 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:28,655 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:28,655 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:28,656 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:28,656 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:28,697 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:29,102 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:37:29,121 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:29,125 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:29,705 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:29,706 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 14] total 22 [2019-10-15 01:37:29,706 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700447637] [2019-10-15 01:37:29,708 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-15 01:37:29,708 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:29,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-15 01:37:29,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2019-10-15 01:37:29,709 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand 22 states. [2019-10-15 01:37:30,170 WARN L191 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 55 [2019-10-15 01:37:30,437 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 56 [2019-10-15 01:37:30,809 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 55 [2019-10-15 01:37:31,101 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 54 [2019-10-15 01:37:31,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:31,768 INFO L93 Difference]: Finished difference Result 191 states and 240 transitions. [2019-10-15 01:37:31,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-15 01:37:31,769 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 37 [2019-10-15 01:37:31,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:31,772 INFO L225 Difference]: With dead ends: 191 [2019-10-15 01:37:31,772 INFO L226 Difference]: Without dead ends: 165 [2019-10-15 01:37:31,776 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=297, Invalid=1185, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:37:31,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-10-15 01:37:31,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 81. [2019-10-15 01:37:31,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-10-15 01:37:31,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 95 transitions. [2019-10-15 01:37:31,811 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 95 transitions. Word has length 37 [2019-10-15 01:37:31,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:31,812 INFO L462 AbstractCegarLoop]: Abstraction has 81 states and 95 transitions. [2019-10-15 01:37:31,812 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-15 01:37:31,812 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 95 transitions. [2019-10-15 01:37:31,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-15 01:37:31,816 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:31,816 INFO L380 BasicCegarLoop]: trace histogram [24, 12, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:32,019 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:32,022 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:32,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:32,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1713703481, now seen corresponding path program 3 times [2019-10-15 01:37:32,023 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:32,023 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202410612] [2019-10-15 01:37:32,023 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:32,023 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:32,023 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:32,041 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:32,042 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [238045554] [2019-10-15 01:37:32,042 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 01:37:32,153 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:37:32,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:37:32,154 INFO L256 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 01:37:32,168 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:32,316 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 15 proven. 310 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2019-10-15 01:37:32,316 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:32,498 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 15 proven. 310 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2019-10-15 01:37:32,498 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202410612] [2019-10-15 01:37:32,498 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:32,499 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238045554] [2019-10-15 01:37:32,499 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731435019] [2019-10-15 01:37:32,500 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:32,500 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:32,501 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:32,501 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:32,501 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:32,522 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:32,843 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:37:32,855 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:32,858 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:33,573 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:33,573 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 40 [2019-10-15 01:37:33,574 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664489165] [2019-10-15 01:37:33,575 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-10-15 01:37:33,575 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:33,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-10-15 01:37:33,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=1333, Unknown=0, NotChecked=0, Total=1560 [2019-10-15 01:37:33,577 INFO L87 Difference]: Start difference. First operand 81 states and 95 transitions. Second operand 40 states. [2019-10-15 01:37:33,789 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 43 [2019-10-15 01:37:37,613 WARN L191 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 56 [2019-10-15 01:37:38,105 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 54 [2019-10-15 01:37:39,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:39,679 INFO L93 Difference]: Finished difference Result 391 states and 496 transitions. [2019-10-15 01:37:39,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-10-15 01:37:39,680 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 61 [2019-10-15 01:37:39,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:39,686 INFO L225 Difference]: With dead ends: 391 [2019-10-15 01:37:39,687 INFO L226 Difference]: Without dead ends: 365 [2019-10-15 01:37:39,692 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3148 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1724, Invalid=7978, Unknown=0, NotChecked=0, Total=9702 [2019-10-15 01:37:39,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2019-10-15 01:37:39,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 106. [2019-10-15 01:37:39,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-10-15 01:37:39,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2019-10-15 01:37:39,725 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 61 [2019-10-15 01:37:39,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:39,726 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2019-10-15 01:37:39,726 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-10-15 01:37:39,726 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2019-10-15 01:37:39,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-15 01:37:39,727 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:39,728 INFO L380 BasicCegarLoop]: trace histogram [36, 12, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:39,931 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:39,932 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:39,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:39,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1482595171, now seen corresponding path program 4 times [2019-10-15 01:37:39,933 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:39,933 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120283928] [2019-10-15 01:37:39,933 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:39,933 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:39,933 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:39,953 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:39,953 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [638603740] [2019-10-15 01:37:39,953 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 01:37:40,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:40,100 INFO L256 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 01:37:40,104 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:40,176 INFO L134 CoverageAnalysis]: Checked inductivity of 976 backedges. 51 proven. 21 refuted. 0 times theorem prover too weak. 904 trivial. 0 not checked. [2019-10-15 01:37:40,177 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:40,265 INFO L134 CoverageAnalysis]: Checked inductivity of 976 backedges. 51 proven. 21 refuted. 0 times theorem prover too weak. 904 trivial. 0 not checked. [2019-10-15 01:37:40,266 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120283928] [2019-10-15 01:37:40,266 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:40,266 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638603740] [2019-10-15 01:37:40,266 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [951981071] [2019-10-15 01:37:40,267 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:40,267 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:40,268 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:40,268 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:40,268 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:40,284 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:40,543 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:37:40,551 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:40,554 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:41,107 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:41,107 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 14] total 32 [2019-10-15 01:37:41,107 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452889480] [2019-10-15 01:37:41,109 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-15 01:37:41,109 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:41,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-15 01:37:41,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2019-10-15 01:37:41,110 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand 32 states. [2019-10-15 01:37:41,287 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2019-10-15 01:37:42,349 WARN L191 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 54 [2019-10-15 01:37:43,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:43,462 INFO L93 Difference]: Finished difference Result 298 states and 421 transitions. [2019-10-15 01:37:43,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-15 01:37:43,463 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 77 [2019-10-15 01:37:43,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:43,465 INFO L225 Difference]: With dead ends: 298 [2019-10-15 01:37:43,466 INFO L226 Difference]: Without dead ends: 205 [2019-10-15 01:37:43,468 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=704, Invalid=2376, Unknown=0, NotChecked=0, Total=3080 [2019-10-15 01:37:43,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2019-10-15 01:37:43,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 201. [2019-10-15 01:37:43,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2019-10-15 01:37:43,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 226 transitions. [2019-10-15 01:37:43,503 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 226 transitions. Word has length 77 [2019-10-15 01:37:43,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:43,503 INFO L462 AbstractCegarLoop]: Abstraction has 201 states and 226 transitions. [2019-10-15 01:37:43,503 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-15 01:37:43,503 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 226 transitions. [2019-10-15 01:37:43,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2019-10-15 01:37:43,506 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:43,506 INFO L380 BasicCegarLoop]: trace histogram [98, 28, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:43,709 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:43,710 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:43,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:43,711 INFO L82 PathProgramCache]: Analyzing trace with hash 2101373704, now seen corresponding path program 5 times [2019-10-15 01:37:43,711 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:43,711 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069872720] [2019-10-15 01:37:43,712 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:43,712 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:43,712 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:43,723 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:43,723 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1923234443] [2019-10-15 01:37:43,723 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:49,837 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-10-15 01:37:49,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:37:49,844 INFO L256 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-15 01:37:49,851 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:50,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5926 backedges. 227 proven. 105 refuted. 0 times theorem prover too weak. 5594 trivial. 0 not checked. [2019-10-15 01:37:50,125 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:50,503 INFO L134 CoverageAnalysis]: Checked inductivity of 5926 backedges. 2 proven. 330 refuted. 0 times theorem prover too weak. 5594 trivial. 0 not checked. [2019-10-15 01:37:50,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069872720] [2019-10-15 01:37:50,503 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:50,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923234443] [2019-10-15 01:37:50,504 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2192399] [2019-10-15 01:37:50,505 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:50,505 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:50,505 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:50,506 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:50,506 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:50,526 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:50,821 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:37:50,828 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:50,833 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:51,392 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:51,392 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 14] total 48 [2019-10-15 01:37:51,392 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060924004] [2019-10-15 01:37:51,394 INFO L442 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-10-15 01:37:51,394 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:51,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-10-15 01:37:51,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=1679, Unknown=0, NotChecked=0, Total=2256 [2019-10-15 01:37:51,395 INFO L87 Difference]: Start difference. First operand 201 states and 226 transitions. Second operand 48 states. [2019-10-15 01:37:51,579 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2019-10-15 01:37:54,062 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 54 [2019-10-15 01:37:56,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:56,144 INFO L93 Difference]: Finished difference Result 577 states and 803 transitions. [2019-10-15 01:37:56,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-10-15 01:37:56,145 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 157 [2019-10-15 01:37:56,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:56,149 INFO L225 Difference]: With dead ends: 577 [2019-10-15 01:37:56,149 INFO L226 Difference]: Without dead ends: 397 [2019-10-15 01:37:56,153 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2280 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2056, Invalid=5600, Unknown=0, NotChecked=0, Total=7656 [2019-10-15 01:37:56,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2019-10-15 01:37:56,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 393. [2019-10-15 01:37:56,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2019-10-15 01:37:56,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 434 transitions. [2019-10-15 01:37:56,204 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 434 transitions. Word has length 157 [2019-10-15 01:37:56,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:56,204 INFO L462 AbstractCegarLoop]: Abstraction has 393 states and 434 transitions. [2019-10-15 01:37:56,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-10-15 01:37:56,204 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 434 transitions. [2019-10-15 01:37:56,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2019-10-15 01:37:56,209 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:56,209 INFO L380 BasicCegarLoop]: trace histogram [210, 60, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:56,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:56,410 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:56,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:56,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1260267000, now seen corresponding path program 6 times [2019-10-15 01:37:56,411 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:56,411 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135901286] [2019-10-15 01:37:56,412 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:56,412 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:56,412 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:56,430 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:56,430 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1218770429] [2019-10-15 01:37:56,430 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:56,817 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:37:56,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:37:56,822 INFO L256 TraceCheckSpWp]: Trace formula consists of 947 conjuncts, 40 conjunts are in the unsatisfiable core [2019-10-15 01:37:56,830 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:57,928 INFO L134 CoverageAnalysis]: Checked inductivity of 25358 backedges. 435 proven. 20239 refuted. 0 times theorem prover too weak. 4684 trivial. 0 not checked. [2019-10-15 01:37:57,929 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:59,178 INFO L134 CoverageAnalysis]: Checked inductivity of 25358 backedges. 435 proven. 20239 refuted. 0 times theorem prover too weak. 4684 trivial. 0 not checked. [2019-10-15 01:37:59,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135901286] [2019-10-15 01:37:59,179 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:59,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218770429] [2019-10-15 01:37:59,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823940350] [2019-10-15 01:37:59,181 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:59,181 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:59,182 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:59,182 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:59,182 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:59,202 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:59,459 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:37:59,470 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:59,474 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:00,590 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:38:00,590 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 14] total 94 [2019-10-15 01:38:00,591 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479076894] [2019-10-15 01:38:00,592 INFO L442 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-10-15 01:38:00,593 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:00,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-10-15 01:38:00,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2243, Invalid=6499, Unknown=0, NotChecked=0, Total=8742 [2019-10-15 01:38:00,596 INFO L87 Difference]: Start difference. First operand 393 states and 434 transitions. Second operand 94 states. [2019-10-15 01:38:00,821 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 43