/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/loops/insertion_sort-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:02:56,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:02:56,694 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:02:56,713 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:02:56,713 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:02:56,715 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:02:56,717 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:02:56,729 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:02:56,731 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:02:56,733 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:02:56,735 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:02:56,736 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:02:56,736 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:02:56,737 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:02:56,738 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:02:56,739 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:02:56,740 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:02:56,740 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:02:56,742 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:02:56,743 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:02:56,745 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:02:56,746 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:02:56,746 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:02:56,747 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:02:56,749 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 04:02:56,749 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 04:02:56,751 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 04:02:56,752 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 04:02:56,753 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 04:02:56,754 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 04:02:56,754 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 04:02:56,755 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 04:02:56,755 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 04:02:56,758 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 04:02:56,759 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 04:02:56,760 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 04:02:56,760 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 04:02:56,760 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 04:02:56,761 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:02:56,762 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:02:56,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:02:56,767 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 04:02:56,786 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:02:56,786 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:02:56,788 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:02:56,788 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:02:56,788 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:02:56,788 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:02:56,789 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:02:56,789 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:02:56,789 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:02:56,789 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:02:56,789 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:02:56,790 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:02:56,790 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:02:56,790 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:02:56,790 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:02:56,791 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:02:56,791 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:02:56,791 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:02:56,791 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:02:56,791 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:02:56,792 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:02:56,792 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:02:56,792 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:02:56,792 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:02:56,793 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:02:56,793 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:02:56,793 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:02:56,793 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:02:56,793 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 04:02:57,085 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:02:57,098 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:02:57,101 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:02:57,102 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:02:57,103 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:02:57,103 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/insertion_sort-2.c [2019-11-07 04:02:57,161 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc8ca0d1a/c1e1d5f98bf84d0db9b885b000ebf10e/FLAG3513b8790 [2019-11-07 04:02:57,583 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:02:57,584 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/insertion_sort-2.c [2019-11-07 04:02:57,590 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc8ca0d1a/c1e1d5f98bf84d0db9b885b000ebf10e/FLAG3513b8790 [2019-11-07 04:02:57,991 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc8ca0d1a/c1e1d5f98bf84d0db9b885b000ebf10e [2019-11-07 04:02:58,003 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:02:58,005 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:02:58,007 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:02:58,007 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:02:58,010 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:02:58,011 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:02:57" (1/1) ... [2019-11-07 04:02:58,014 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fbc0dd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58, skipping insertion in model container [2019-11-07 04:02:58,015 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:02:57" (1/1) ... [2019-11-07 04:02:58,025 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:02:58,047 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:02:58,263 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:02:58,267 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:02:58,290 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:02:58,308 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:02:58,309 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58 WrapperNode [2019-11-07 04:02:58,309 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:02:58,309 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:02:58,309 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:02:58,310 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:02:58,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,399 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,407 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,409 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,420 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,429 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... [2019-11-07 04:02:58,431 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:02:58,432 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:02:58,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:02:58,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:02:58,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:02:58,494 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:02:58,494 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:02:58,494 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:02:58,494 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:02:58,495 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:02:58,495 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:02:58,495 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-11-07 04:02:58,495 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:02:58,495 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 04:02:58,495 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 04:02:58,496 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 04:02:58,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 04:02:58,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:02:58,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:02:58,867 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:02:58,868 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 04:02:58,869 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:02:58 BoogieIcfgContainer [2019-11-07 04:02:58,869 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:02:58,870 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:02:58,870 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:02:58,873 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:02:58,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:02:57" (1/3) ... [2019-11-07 04:02:58,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16d9855c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:02:58, skipping insertion in model container [2019-11-07 04:02:58,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:02:58" (2/3) ... [2019-11-07 04:02:58,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16d9855c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:02:58, skipping insertion in model container [2019-11-07 04:02:58,875 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:02:58" (3/3) ... [2019-11-07 04:02:58,876 INFO L109 eAbstractionObserver]: Analyzing ICFG insertion_sort-2.c [2019-11-07 04:02:58,886 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:02:58,894 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:02:58,902 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:02:58,922 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:02:58,922 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:02:58,922 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:02:58,922 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:02:58,922 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:02:58,923 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:02:58,923 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:02:58,923 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:02:58,937 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-07 04:02:58,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 04:02:58,943 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:58,944 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:58,946 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:58,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:58,951 INFO L82 PathProgramCache]: Analyzing trace with hash 369057583, now seen corresponding path program 1 times [2019-11-07 04:02:58,958 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:58,958 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942719572] [2019-11-07 04:02:58,958 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:59,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:59,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:59,215 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942719572] [2019-11-07 04:02:59,215 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:02:59,216 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 04:02:59,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975971518] [2019-11-07 04:02:59,221 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 04:02:59,222 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:59,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 04:02:59,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 04:02:59,237 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 4 states. [2019-11-07 04:02:59,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:59,337 INFO L93 Difference]: Finished difference Result 43 states and 56 transitions. [2019-11-07 04:02:59,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 04:02:59,339 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-11-07 04:02:59,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:59,348 INFO L225 Difference]: With dead ends: 43 [2019-11-07 04:02:59,348 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 04:02:59,352 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-07 04:02:59,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 04:02:59,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2019-11-07 04:02:59,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-07 04:02:59,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-07 04:02:59,393 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 11 [2019-11-07 04:02:59,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:59,395 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-07 04:02:59,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 04:02:59,395 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-07 04:02:59,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 04:02:59,397 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:59,397 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:59,398 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:59,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:59,399 INFO L82 PathProgramCache]: Analyzing trace with hash 2062416228, now seen corresponding path program 1 times [2019-11-07 04:02:59,399 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:59,400 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320506759] [2019-11-07 04:02:59,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:59,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:59,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:59,957 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320506759] [2019-11-07 04:02:59,957 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42954180] [2019-11-07 04:02:59,958 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:03:00,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:00,030 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-07 04:03:00,036 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:03:00,078 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,248 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-07 04:03:00,252 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2019-11-07 04:03:00,253 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,267 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:03:00,269 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-07 04:03:00,269 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:37, output treesize:30 [2019-11-07 04:03:00,314 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:03:00,314 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2019-11-07 04:03:00,316 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,318 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:03:00,318 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,318 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2019-11-07 04:03:00,320 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:00,362 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:03:00,487 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,488 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,491 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,494 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,505 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 41 [2019-11-07 04:03:00,509 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,513 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,521 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,528 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,542 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:03:00,542 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 51 treesize of output 63 [2019-11-07 04:03:00,543 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,544 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,545 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,546 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,547 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,549 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,549 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,551 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,552 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,553 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,555 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,556 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,558 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,559 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,560 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,562 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-07 04:03:00,574 INFO L567 ElimStorePlain]: treesize reduction 40, result has 23.1 percent of original size [2019-11-07 04:03:00,575 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,579 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2019-11-07 04:03:00,582 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,589 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,591 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,597 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-07 04:03:00,598 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2019-11-07 04:03:00,598 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,599 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:03:00,600 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,602 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 04:03:00,602 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,619 INFO L567 ElimStorePlain]: treesize reduction 9, result has 43.8 percent of original size [2019-11-07 04:03:00,619 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 04:03:00,620 INFO L221 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:83, output treesize:7 [2019-11-07 04:03:00,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:00,695 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1304043177] [2019-11-07 04:03:00,729 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 04:03:00,729 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:03:00,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:03:00,744 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:03:00,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:03:00,858 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:03:01,157 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2019-11-07 04:03:01,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:03:01,168 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:03:01,881 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:03:01,881 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 33 [2019-11-07 04:03:01,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791205804] [2019-11-07 04:03:01,888 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-07 04:03:01,888 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:03:01,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-07 04:03:01,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=953, Unknown=0, NotChecked=0, Total=1056 [2019-11-07 04:03:01,896 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 33 states. [2019-11-07 04:03:04,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:03:04,893 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2019-11-07 04:03:04,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-07 04:03:04,894 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 15 [2019-11-07 04:03:04,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:03:04,898 INFO L225 Difference]: With dead ends: 78 [2019-11-07 04:03:04,899 INFO L226 Difference]: Without dead ends: 76 [2019-11-07 04:03:04,901 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1011 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=531, Invalid=3501, Unknown=0, NotChecked=0, Total=4032 [2019-11-07 04:03:04,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-07 04:03:04,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 35. [2019-11-07 04:03:04,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-07 04:03:04,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2019-11-07 04:03:04,919 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 15 [2019-11-07 04:03:04,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:03:04,920 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2019-11-07 04:03:04,920 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-07 04:03:04,920 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2019-11-07 04:03:04,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 04:03:04,922 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:03:04,922 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:03:05,125 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:03:05,126 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:03:05,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:03:05,126 INFO L82 PathProgramCache]: Analyzing trace with hash -974186864, now seen corresponding path program 1 times [2019-11-07 04:03:05,127 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:03:05,127 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232574872] [2019-11-07 04:03:05,127 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:03:05,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:05,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:05,177 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232574872] [2019-11-07 04:03:05,178 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664616122] [2019-11-07 04:03:05,178 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 [2019-11-07 04:03:05,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:05,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 04:03:05,248 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:03:05,261 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:05,262 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:03:05,303 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:05,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [642876198] [2019-11-07 04:03:05,306 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 04:03:05,306 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:03:05,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:03:05,306 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:03:05,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:03:05,344 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:03:05,622 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2019-11-07 04:03:05,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:03:05,631 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:03:06,103 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:03:06,104 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 11] total 17 [2019-11-07 04:03:06,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485812742] [2019-11-07 04:03:06,105 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 04:03:06,106 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:03:06,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 04:03:06,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2019-11-07 04:03:06,108 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand 17 states. [2019-11-07 04:03:07,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:03:07,566 INFO L93 Difference]: Finished difference Result 75 states and 91 transitions. [2019-11-07 04:03:07,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-07 04:03:07,568 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 19 [2019-11-07 04:03:07,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:03:07,571 INFO L225 Difference]: With dead ends: 75 [2019-11-07 04:03:07,571 INFO L226 Difference]: Without dead ends: 56 [2019-11-07 04:03:07,572 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=212, Invalid=978, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 04:03:07,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-07 04:03:07,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 37. [2019-11-07 04:03:07,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 04:03:07,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2019-11-07 04:03:07,584 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 19 [2019-11-07 04:03:07,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:03:07,585 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2019-11-07 04:03:07,585 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 04:03:07,585 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2019-11-07 04:03:07,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 04:03:07,586 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:03:07,586 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:03:07,789 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:03:07,792 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:03:07,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:03:07,793 INFO L82 PathProgramCache]: Analyzing trace with hash 167961903, now seen corresponding path program 2 times [2019-11-07 04:03:07,793 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:03:07,793 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408169300] [2019-11-07 04:03:07,794 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:03:07,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:08,183 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:08,184 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408169300] [2019-11-07 04:03:08,184 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767945311] [2019-11-07 04:03:08,184 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 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 [2019-11-07 04:03:08,241 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 04:03:08,242 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:03:08,243 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 04:03:08,245 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:03:08,422 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:08,422 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:03:08,663 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:08,664 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [763665095] [2019-11-07 04:03:08,665 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 04:03:08,665 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:03:08,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:03:08,666 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:03:08,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:03:08,695 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:03:08,909 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2019-11-07 04:03:08,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:03:08,920 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:03:09,589 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:03:09,589 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 35 [2019-11-07 04:03:09,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995564251] [2019-11-07 04:03:09,591 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 04:03:09,591 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:03:09,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 04:03:09,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 04:03:09,593 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand 35 states. [2019-11-07 04:03:10,182 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 43 [2019-11-07 04:03:13,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:03:13,998 INFO L93 Difference]: Finished difference Result 96 states and 122 transitions. [2019-11-07 04:03:13,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-11-07 04:03:13,999 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 21 [2019-11-07 04:03:13,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:03:14,001 INFO L225 Difference]: With dead ends: 96 [2019-11-07 04:03:14,001 INFO L226 Difference]: Without dead ends: 94 [2019-11-07 04:03:14,003 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=722, Invalid=4680, Unknown=0, NotChecked=0, Total=5402 [2019-11-07 04:03:14,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-07 04:03:14,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 43. [2019-11-07 04:03:14,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-07 04:03:14,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 53 transitions. [2019-11-07 04:03:14,017 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 53 transitions. Word has length 21 [2019-11-07 04:03:14,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:03:14,017 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 53 transitions. [2019-11-07 04:03:14,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 04:03:14,017 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 53 transitions. [2019-11-07 04:03:14,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-07 04:03:14,018 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:03:14,018 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:03:14,222 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:03:14,222 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:03:14,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:03:14,223 INFO L82 PathProgramCache]: Analyzing trace with hash -242389062, now seen corresponding path program 1 times [2019-11-07 04:03:14,223 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:03:14,223 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153677335] [2019-11-07 04:03:14,223 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:03:14,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:14,435 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:14,436 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153677335] [2019-11-07 04:03:14,436 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895412827] [2019-11-07 04:03:14,436 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 [2019-11-07 04:03:14,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:14,499 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 04:03:14,501 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:03:14,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:14,571 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:03:14,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:14,685 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2058608764] [2019-11-07 04:03:14,687 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 04:03:14,688 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:03:14,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:03:14,689 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:03:14,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:03:14,712 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:03:14,997 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2019-11-07 04:03:15,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:03:15,007 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:03:15,645 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:03:15,646 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6, 13] total 25 [2019-11-07 04:03:15,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334408731] [2019-11-07 04:03:15,647 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 04:03:15,647 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:03:15,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 04:03:15,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2019-11-07 04:03:15,648 INFO L87 Difference]: Start difference. First operand 43 states and 53 transitions. Second operand 25 states. [2019-11-07 04:03:16,918 WARN L191 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 54 [2019-11-07 04:03:18,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:03:18,007 INFO L93 Difference]: Finished difference Result 81 states and 102 transitions. [2019-11-07 04:03:18,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-07 04:03:18,013 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 22 [2019-11-07 04:03:18,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:03:18,014 INFO L225 Difference]: With dead ends: 81 [2019-11-07 04:03:18,014 INFO L226 Difference]: Without dead ends: 64 [2019-11-07 04:03:18,016 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=393, Invalid=2157, Unknown=0, NotChecked=0, Total=2550 [2019-11-07 04:03:18,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-07 04:03:18,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 43. [2019-11-07 04:03:18,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-07 04:03:18,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2019-11-07 04:03:18,027 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 22 [2019-11-07 04:03:18,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:03:18,027 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2019-11-07 04:03:18,027 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 04:03:18,028 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2019-11-07 04:03:18,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 04:03:18,029 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:03:18,029 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:03:18,232 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:03:18,232 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:03:18,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:03:18,233 INFO L82 PathProgramCache]: Analyzing trace with hash 72483108, now seen corresponding path program 3 times [2019-11-07 04:03:18,233 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:03:18,233 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978340134] [2019-11-07 04:03:18,233 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:03:18,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:03:18,770 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:18,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978340134] [2019-11-07 04:03:18,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678806759] [2019-11-07 04:03:18,770 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 [2019-11-07 04:03:18,829 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:03:18,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:03:18,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 35 conjunts are in the unsatisfiable core [2019-11-07 04:03:18,837 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:03:19,269 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:03:19,269 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:03:30,144 WARN L191 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 20 [2019-11-07 04:03:38,693 WARN L191 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 25