/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:39:55,815 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:39:55,818 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:39:55,831 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:39:55,831 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:39:55,832 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:39:55,834 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:39:55,836 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:39:55,837 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:39:55,838 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:39:55,839 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:39:55,840 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:39:55,841 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:39:55,842 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:39:55,843 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:39:55,844 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:39:55,845 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:39:55,846 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:39:55,850 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:39:55,856 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:39:55,858 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:39:55,860 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:39:55,864 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:39:55,865 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:39:55,867 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:39:55,867 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:39:55,869 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:39:55,870 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:39:55,871 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:39:55,872 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 11:39:55,872 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 11:39:55,875 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 11:39:55,876 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 11:39:55,878 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 11:39:55,880 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 11:39:55,880 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 11:39:55,882 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 11:39:55,882 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 11:39:55,882 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:39:55,883 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:39:55,885 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:39:55,886 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 [2020-07-21 11:39:55,906 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:39:55,906 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:39:55,909 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:39:55,909 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:39:55,909 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:39:55,909 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:39:55,910 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:39:55,910 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:39:55,910 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:39:55,910 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:39:55,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:39:55,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:39:55,912 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:39:55,912 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:39:55,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:39:55,912 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:39:55,913 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:39:55,913 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:39:55,913 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:39:55,913 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:39:55,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:39:55,914 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:39:55,914 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:39:55,914 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:39:55,914 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:39:55,914 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:39:55,915 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:55,915 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:39:55,915 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:39:55,915 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:39:56,192 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:39:56,207 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:39:56,210 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:39:56,212 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:39:56,213 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:39:56,214 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-2.i [2020-07-21 11:39:56,288 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/905cec2dd/2581cdd3640b4d73ab3dcb874aa69ea7/FLAG6488f21c0 [2020-07-21 11:39:56,736 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:39:56,737 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-2.i [2020-07-21 11:39:56,744 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/905cec2dd/2581cdd3640b4d73ab3dcb874aa69ea7/FLAG6488f21c0 [2020-07-21 11:39:57,114 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/905cec2dd/2581cdd3640b4d73ab3dcb874aa69ea7 [2020-07-21 11:39:57,125 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:39:57,129 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:39:57,130 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:39:57,131 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:39:57,134 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:39:57,135 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,138 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5957ebad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57, skipping insertion in model container [2020-07-21 11:39:57,139 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,147 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:39:57,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:39:57,346 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:39:57,353 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:39:57,375 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:39:57,394 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:39:57,395 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57 WrapperNode [2020-07-21 11:39:57,395 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:39:57,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:39:57,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:39:57,396 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:39:57,407 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,412 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,412 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,415 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,419 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (1/1) ... [2020-07-21 11:39:57,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:39:57,421 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:39:57,421 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:39:57,422 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:39:57,422 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (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 [2020-07-21 11:39:57,573 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:39:57,573 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:39:57,573 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:39:57,574 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:39:57,574 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:39:57,574 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:39:57,574 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:39:57,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:39:57,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:39:57,759 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:39:57,760 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:39:57,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:39:57 BoogieIcfgContainer [2020-07-21 11:39:57,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:39:57,765 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:39:57,765 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:39:57,769 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:39:57,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:39:57" (1/3) ... [2020-07-21 11:39:57,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24880bdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:39:57, skipping insertion in model container [2020-07-21 11:39:57,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:57" (2/3) ... [2020-07-21 11:39:57,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24880bdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:39:57, skipping insertion in model container [2020-07-21 11:39:57,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:39:57" (3/3) ... [2020-07-21 11:39:57,773 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-2.i [2020-07-21 11:39:57,785 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:39:57,792 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:39:57,807 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:39:57,833 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:39:57,834 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:39:57,834 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:39:57,834 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:39:57,834 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:39:57,834 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:39:57,835 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:39:57,835 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:39:57,854 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-07-21 11:39:57,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 11:39:57,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:57,862 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:57,863 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:57,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:57,870 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2020-07-21 11:39:57,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:57,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943558454] [2020-07-21 11:39:57,878 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:57,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:57,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:39:57,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:57,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:57,970 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:39:57,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943558454] [2020-07-21 11:39:57,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:39:57,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:39:57,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028399382] [2020-07-21 11:39:57,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:39:57,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:57,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:39:57,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:39:57,998 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2020-07-21 11:39:58,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:58,020 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-07-21 11:39:58,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:39:58,021 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 11:39:58,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:58,030 INFO L225 Difference]: With dead ends: 29 [2020-07-21 11:39:58,031 INFO L226 Difference]: Without dead ends: 12 [2020-07-21 11:39:58,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:39:58,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-21 11:39:58,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-21 11:39:58,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-21 11:39:58,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-21 11:39:58,074 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-21 11:39:58,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:58,074 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-21 11:39:58,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:39:58,075 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-21 11:39:58,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 11:39:58,075 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:58,076 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:58,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:58,291 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:58,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:58,293 INFO L82 PathProgramCache]: Analyzing trace with hash -15914692, now seen corresponding path program 1 times [2020-07-21 11:39:58,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:58,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1902079016] [2020-07-21 11:39:58,294 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:58,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:58,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 11:39:58,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:58,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:58,384 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:39:58,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1902079016] [2020-07-21 11:39:58,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:39:58,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:39:58,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391776446] [2020-07-21 11:39:58,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:39:58,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:58,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:39:58,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:39:58,391 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2020-07-21 11:39:58,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:58,415 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-07-21 11:39:58,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:39:58,416 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 11:39:58,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:58,418 INFO L225 Difference]: With dead ends: 19 [2020-07-21 11:39:58,418 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 11:39:58,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:39:58,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 11:39:58,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-07-21 11:39:58,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-21 11:39:58,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-07-21 11:39:58,425 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2020-07-21 11:39:58,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:58,436 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-07-21 11:39:58,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:39:58,437 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-07-21 11:39:58,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 11:39:58,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:58,438 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:58,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:58,655 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:58,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:58,656 INFO L82 PathProgramCache]: Analyzing trace with hash -1244203718, now seen corresponding path program 1 times [2020-07-21 11:39:58,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:58,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313643993] [2020-07-21 11:39:58,657 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:58,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:58,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:39:58,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:58,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:58,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:58,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:58,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313643993] [2020-07-21 11:39:58,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:39:58,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 11:39:58,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649121977] [2020-07-21 11:39:58,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:39:58,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:58,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:39:58,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:39:58,777 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2020-07-21 11:39:58,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:58,818 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-07-21 11:39:58,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:39:58,819 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-21 11:39:58,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:58,820 INFO L225 Difference]: With dead ends: 24 [2020-07-21 11:39:58,820 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 11:39:58,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:39:58,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 11:39:58,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 11:39:58,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 11:39:58,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-07-21 11:39:58,826 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12 [2020-07-21 11:39:58,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:58,827 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-07-21 11:39:58,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:39:58,827 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-07-21 11:39:58,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 11:39:58,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:58,828 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:59,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:59,030 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:59,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:59,031 INFO L82 PathProgramCache]: Analyzing trace with hash 263826484, now seen corresponding path program 2 times [2020-07-21 11:39:59,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:59,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984770279] [2020-07-21 11:39:59,033 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:59,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:59,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:39:59,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:59,131 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:59,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:59,203 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:59,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984770279] [2020-07-21 11:39:59,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:39:59,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 11:39:59,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737457129] [2020-07-21 11:39:59,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 11:39:59,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:59,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 11:39:59,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:39:59,207 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2020-07-21 11:39:59,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:59,255 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 11:39:59,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 11:39:59,255 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2020-07-21 11:39:59,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:59,257 INFO L225 Difference]: With dead ends: 32 [2020-07-21 11:39:59,257 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 11:39:59,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:39:59,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 11:39:59,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 11:39:59,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 11:39:59,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-07-21 11:39:59,265 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 18 [2020-07-21 11:39:59,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:59,265 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-07-21 11:39:59,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 11:39:59,266 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-07-21 11:39:59,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 11:39:59,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:59,267 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:59,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:59,482 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:59,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:59,483 INFO L82 PathProgramCache]: Analyzing trace with hash 386905900, now seen corresponding path program 3 times [2020-07-21 11:39:59,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:59,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360246033] [2020-07-21 11:39:59,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:59,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:59,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 11:39:59,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:59,697 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:59,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:59,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:40:00,012 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:00,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360246033] [2020-07-21 11:40:00,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:40:00,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 11:40:00,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753403783] [2020-07-21 11:40:00,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 11:40:00,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:00,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 11:40:00,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:40:00,018 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 22 states. [2020-07-21 11:40:00,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:00,187 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-07-21 11:40:00,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 11:40:00,187 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 26 [2020-07-21 11:40:00,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:00,188 INFO L225 Difference]: With dead ends: 34 [2020-07-21 11:40:00,189 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 11:40:00,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=451, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:40:00,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 11:40:00,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 11:40:00,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 11:40:00,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-07-21 11:40:00,197 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-07-21 11:40:00,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:00,197 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-07-21 11:40:00,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 11:40:00,198 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-07-21 11:40:00,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 11:40:00,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:00,199 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:00,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:00,413 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:00,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:00,414 INFO L82 PathProgramCache]: Analyzing trace with hash -680671446, now seen corresponding path program 4 times [2020-07-21 11:40:00,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:00,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640324264] [2020-07-21 11:40:00,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:00,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:00,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 11:40:00,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:00,531 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:00,532 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:40:00,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640324264] [2020-07-21 11:40:00,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:40:00,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-07-21 11:40:00,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252342459] [2020-07-21 11:40:00,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 11:40:00,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:00,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 11:40:00,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:40:00,535 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 11 states. [2020-07-21 11:40:00,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:00,603 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-07-21 11:40:00,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:40:00,604 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2020-07-21 11:40:00,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:00,604 INFO L225 Difference]: With dead ends: 29 [2020-07-21 11:40:00,604 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 11:40:00,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:40:00,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 11:40:00,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 11:40:00,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 11:40:00,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 11:40:00,606 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2020-07-21 11:40:00,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:00,606 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 11:40:00,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 11:40:00,607 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 11:40:00,607 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 11:40:00,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:00,819 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 11:40:01,093 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 52 [2020-07-21 11:40:01,097 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 11:40:01,097 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 11:40:01,097 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 11:40:01,098 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 11:40:01,098 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 11:40:01,098 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 11:40:01,098 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2020-07-21 11:40:01,098 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 17) no Hoare annotation was computed. [2020-07-21 11:40:01,099 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 11 17) no Hoare annotation was computed. [2020-07-21 11:40:01,099 INFO L268 CegarLoopResult]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2020-07-21 11:40:01,099 INFO L264 CegarLoopResult]: At program point L13-3(lines 13 15) the Hoare annotation is: (or (and (<= 2 main_~i~0) (<= main_~i~0 2) (= 2 main_~sn~0)) (and (<= main_~i~0 8) (<= 8 main_~i~0) (= 14 main_~sn~0)) (and (<= main_~i~0 4) (= 6 main_~sn~0) (<= 4 main_~i~0)) (and (= 0 main_~sn~0) (<= main_~i~0 1) (<= 1 main_~i~0)) (and (<= 9 main_~i~0) (= 16 main_~sn~0)) (and (< main_~i~0 7) (= 10 main_~sn~0) (<= 6 main_~i~0)) (and (<= main_~i~0 3) (= 4 main_~sn~0) (<= 3 main_~i~0)) (and (<= 5 main_~i~0) (= 8 main_~sn~0) (<= main_~i~0 5)) (and (<= 7 main_~i~0) (= 12 main_~sn~0) (< main_~i~0 8))) [2020-07-21 11:40:01,099 INFO L264 CegarLoopResult]: At program point L13-4(lines 13 15) the Hoare annotation is: (= 16 main_~sn~0) [2020-07-21 11:40:01,100 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-07-21 11:40:01,100 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-07-21 11:40:01,100 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-21 11:40:01,100 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-07-21 11:40:01,100 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-07-21 11:40:01,100 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-07-21 11:40:01,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:40:01 BoogieIcfgContainer [2020-07-21 11:40:01,121 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:40:01,124 INFO L168 Benchmark]: Toolchain (without parser) took 3996.26 ms. Allocated memory was 136.3 MB in the beginning and 229.6 MB in the end (delta: 93.3 MB). Free memory was 101.5 MB in the beginning and 91.3 MB in the end (delta: 10.1 MB). Peak memory consumption was 103.5 MB. Max. memory is 7.1 GB. [2020-07-21 11:40:01,125 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 11:40:01,126 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.49 ms. Allocated memory is still 136.3 MB. Free memory was 101.2 MB in the beginning and 91.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 11:40:01,127 INFO L168 Benchmark]: Boogie Preprocessor took 24.65 ms. Allocated memory is still 136.3 MB. Free memory was 91.9 MB in the beginning and 90.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 11:40:01,128 INFO L168 Benchmark]: RCFGBuilder took 342.66 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 90.5 MB in the beginning and 168.0 MB in the end (delta: -77.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 11:40:01,129 INFO L168 Benchmark]: TraceAbstraction took 3356.31 ms. Allocated memory was 200.3 MB in the beginning and 229.6 MB in the end (delta: 29.4 MB). Free memory was 168.0 MB in the beginning and 91.3 MB in the end (delta: 76.6 MB). Peak memory consumption was 106.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:40:01,133 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.49 ms. Allocated memory is still 136.3 MB. Free memory was 101.2 MB in the beginning and 91.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.65 ms. Allocated memory is still 136.3 MB. Free memory was 91.9 MB in the beginning and 90.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 342.66 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 90.5 MB in the beginning and 168.0 MB in the end (delta: -77.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3356.31 ms. Allocated memory was 200.3 MB in the beginning and 229.6 MB in the end (delta: 29.4 MB). Free memory was 168.0 MB in the beginning and 91.3 MB in the end (delta: 76.6 MB). Peak memory consumption was 106.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: (((((((((2 <= i && i <= 2) && 2 == sn) || ((i <= 8 && 8 <= i) && 14 == sn)) || ((i <= 4 && 6 == sn) && 4 <= i)) || ((0 == sn && i <= 1) && 1 <= i)) || (9 <= i && 16 == sn)) || ((i < 7 && 10 == sn) && 6 <= i)) || ((i <= 3 && 4 == sn) && 3 <= i)) || ((5 <= i && 8 == sn) && i <= 5)) || ((7 <= i && 12 == sn) && i < 8) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.9s, OverallIterations: 6, TraceHistogramMax: 9, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 70 SDtfs, 14 SDslu, 285 SDs, 0 SdLazy, 254 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 155 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 12 PreInvPairs, 22 NumberOfFragments, 96 HoareAnnotationTreeSize, 12 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 7 FomulaSimplificationsInter, 6 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 104 NumberOfCodeBlocks, 104 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 151 ConstructedInterpolants, 0 QuantifiedInterpolants, 9191 SizeOfPredicates, 6 NumberOfNonLiveVariables, 254 ConjunctsInSsa, 43 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 81/243 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...