/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loop-simple/nested_2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 04:49:31,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 04:49:31,699 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 04:49:31,756 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-22 04:49:31,789 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 04:49:31,792 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 04:49:31,794 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 04:49:31,797 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 04:49:31,810 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 04:49:31,813 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 04:49:31,820 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 04:49:31,827 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 04:49:31,829 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 04:49:31,831 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 04:49:31,833 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 04:49:31,836 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 04:49:31,846 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 04:49:31,858 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 04:49:31,858 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 04:49:31,859 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 04:49:31,860 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 04:49:31,910 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 04:49:31,910 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 04:49:31,914 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 04:49:31,914 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 04:49:31,915 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 04:49:31,915 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 04:49:31,915 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 04:49:31,915 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 04:49:31,915 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 04:49:31,916 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 04:49:31,917 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 04:49:31,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 04:49:31,917 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 04:49:31,917 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 04:49:31,918 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 04:49:31,918 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 04:49:31,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 04:49:31,918 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 04:49:31,919 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 04:49:31,919 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 04:49:31,919 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 04:49:31,919 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 04:49:31,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 04:49:31,920 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 04:49:31,920 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 04:49:31,920 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 04:49:32,371 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 04:49:32,397 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 04:49:32,400 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 04:49:32,401 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 04:49:32,402 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 04:49:32,403 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/nested_2.c [2020-12-22 04:49:32,493 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be8e28bed/e0e124401d5242909a81b99e6014e772/FLAG820e2cc96 [2020-12-22 04:49:33,072 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 04:49:33,073 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_2.c [2020-12-22 04:49:33,080 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be8e28bed/e0e124401d5242909a81b99e6014e772/FLAG820e2cc96 [2020-12-22 04:49:33,470 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be8e28bed/e0e124401d5242909a81b99e6014e772 [2020-12-22 04:49:33,474 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 04:49:33,476 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 04:49:33,481 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 04:49:33,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 04:49:33,485 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 04:49:33,487 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,490 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@159db8b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33, skipping insertion in model container [2020-12-22 04:49:33,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,499 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 04:49:33,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 04:49:33,739 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_2.c[730,743] [2020-12-22 04:49:33,749 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:49:33,762 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 04:49:33,779 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_2.c[730,743] [2020-12-22 04:49:33,780 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:49:33,796 INFO L208 MainTranslator]: Completed translation [2020-12-22 04:49:33,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33 WrapperNode [2020-12-22 04:49:33,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 04:49:33,799 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 04:49:33,799 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 04:49:33,799 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 04:49:33,807 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,817 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,842 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 04:49:33,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 04:49:33,847 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 04:49:33,847 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 04:49:33,857 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,857 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,860 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,860 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,865 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,874 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,882 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (1/1) ... [2020-12-22 04:49:33,884 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 04:49:33,886 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 04:49:33,886 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 04:49:33,886 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 04:49:33,887 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (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 [2020-12-22 04:49:33,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 04:49:33,992 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 04:49:33,992 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 04:49:33,993 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 04:49:34,199 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 04:49:34,200 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2020-12-22 04:49:34,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:49:34 BoogieIcfgContainer [2020-12-22 04:49:34,201 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 04:49:34,203 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 04:49:34,203 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 04:49:34,206 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 04:49:34,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:49:33" (1/3) ... [2020-12-22 04:49:34,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e8cf305 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:49:34, skipping insertion in model container [2020-12-22 04:49:34,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:49:33" (2/3) ... [2020-12-22 04:49:34,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e8cf305 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:49:34, skipping insertion in model container [2020-12-22 04:49:34,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:49:34" (3/3) ... [2020-12-22 04:49:34,210 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_2.c [2020-12-22 04:49:34,217 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 04:49:34,221 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 04:49:34,242 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 04:49:34,274 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 04:49:34,275 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 04:49:34,275 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 04:49:34,275 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 04:49:34,275 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 04:49:34,275 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 04:49:34,275 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 04:49:34,276 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 04:49:34,290 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2020-12-22 04:49:34,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-22 04:49:34,295 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:34,296 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-12-22 04:49:34,297 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:34,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:34,304 INFO L82 PathProgramCache]: Analyzing trace with hash 28697382, now seen corresponding path program 1 times [2020-12-22 04:49:34,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:34,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140602868] [2020-12-22 04:49:34,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:34,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:34,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:49:34,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140602868] [2020-12-22 04:49:34,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 04:49:34,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 04:49:34,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517625184] [2020-12-22 04:49:34,546 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 04:49:34,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:34,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 04:49:34,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 04:49:34,566 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 3 states. [2020-12-22 04:49:34,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:34,607 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2020-12-22 04:49:34,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 04:49:34,610 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2020-12-22 04:49:34,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:34,620 INFO L225 Difference]: With dead ends: 28 [2020-12-22 04:49:34,621 INFO L226 Difference]: Without dead ends: 13 [2020-12-22 04:49:34,625 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 04:49:34,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-22 04:49:34,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 10. [2020-12-22 04:49:34,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-22 04:49:34,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2020-12-22 04:49:34,667 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 5 [2020-12-22 04:49:34,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:34,667 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2020-12-22 04:49:34,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 04:49:34,667 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2020-12-22 04:49:34,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-22 04:49:34,668 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:34,668 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:49:34,669 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 04:49:34,669 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:34,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:34,670 INFO L82 PathProgramCache]: Analyzing trace with hash 269344378, now seen corresponding path program 1 times [2020-12-22 04:49:34,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:34,671 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029139711] [2020-12-22 04:49:34,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:34,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:34,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:49:34,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029139711] [2020-12-22 04:49:34,718 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 04:49:34,718 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 04:49:34,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729495373] [2020-12-22 04:49:34,725 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 04:49:34,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:34,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 04:49:34,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 04:49:34,727 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 3 states. [2020-12-22 04:49:34,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:34,757 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2020-12-22 04:49:34,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 04:49:34,758 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-22 04:49:34,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:34,759 INFO L225 Difference]: With dead ends: 19 [2020-12-22 04:49:34,759 INFO L226 Difference]: Without dead ends: 12 [2020-12-22 04:49:34,760 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 04:49:34,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-22 04:49:34,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2020-12-22 04:49:34,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-22 04:49:34,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-12-22 04:49:34,764 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-12-22 04:49:34,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:34,764 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-12-22 04:49:34,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 04:49:34,765 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-12-22 04:49:34,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 04:49:34,765 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:34,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:49:34,766 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 04:49:34,766 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:34,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:34,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1485378760, now seen corresponding path program 1 times [2020-12-22 04:49:34,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:34,768 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571105447] [2020-12-22 04:49:34,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:34,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:34,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:49:34,817 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571105447] [2020-12-22 04:49:34,817 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848389429] [2020-12-22 04:49:34,817 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 -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 [2020-12-22 04:49:34,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:34,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-22 04:49:34,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:34,973 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:49:34,974 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:34,975 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-22 04:49:34,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502607470] [2020-12-22 04:49:34,977 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 04:49:34,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:34,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 04:49:34,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-22 04:49:34,982 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 5 states. [2020-12-22 04:49:35,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:35,032 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2020-12-22 04:49:35,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 04:49:35,033 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 04:49:35,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:35,037 INFO L225 Difference]: With dead ends: 22 [2020-12-22 04:49:35,037 INFO L226 Difference]: Without dead ends: 14 [2020-12-22 04:49:35,038 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-22 04:49:35,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-22 04:49:35,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-12-22 04:49:35,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-22 04:49:35,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-22 04:49:35,048 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-12-22 04:49:35,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:35,049 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-22 04:49:35,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 04:49:35,049 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-22 04:49:35,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-22 04:49:35,050 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:35,050 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:49:35,265 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 04:49:35,266 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:35,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:35,268 INFO L82 PathProgramCache]: Analyzing trace with hash 147832950, now seen corresponding path program 2 times [2020-12-22 04:49:35,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:35,269 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253605500] [2020-12-22 04:49:35,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:35,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:35,312 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 04:49:35,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253605500] [2020-12-22 04:49:35,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457292987] [2020-12-22 04:49:35,313 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-12-22 04:49:35,368 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 04:49:35,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:35,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-22 04:49:35,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:35,414 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:49:35,415 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:35,415 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-22 04:49:35,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510203909] [2020-12-22 04:49:35,416 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 04:49:35,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:35,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 04:49:35,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:49:35,417 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 7 states. [2020-12-22 04:49:35,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:35,531 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2020-12-22 04:49:35,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-22 04:49:35,532 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-22 04:49:35,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:35,533 INFO L225 Difference]: With dead ends: 45 [2020-12-22 04:49:35,533 INFO L226 Difference]: Without dead ends: 35 [2020-12-22 04:49:35,534 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2020-12-22 04:49:35,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-22 04:49:35,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 24. [2020-12-22 04:49:35,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-22 04:49:35,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-22 04:49:35,542 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 12 [2020-12-22 04:49:35,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:35,542 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-22 04:49:35,542 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 04:49:35,543 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-22 04:49:35,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-22 04:49:35,544 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:35,544 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-22 04:49:35,759 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:35,760 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:35,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:35,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1657769242, now seen corresponding path program 3 times [2020-12-22 04:49:35,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:35,762 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073512040] [2020-12-22 04:49:35,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:35,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:35,835 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-22 04:49:35,836 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073512040] [2020-12-22 04:49:35,836 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918833781] [2020-12-22 04:49:35,836 INFO L93 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 [2020-12-22 04:49:35,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-22 04:49:35,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:35,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-22 04:49:35,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:35,974 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 04:49:35,974 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:35,975 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-22 04:49:35,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443630492] [2020-12-22 04:49:35,976 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 04:49:35,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:35,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 04:49:35,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:49:35,977 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-12-22 04:49:36,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:36,016 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-12-22 04:49:36,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 04:49:36,017 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-12-22 04:49:36,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:36,018 INFO L225 Difference]: With dead ends: 44 [2020-12-22 04:49:36,019 INFO L226 Difference]: Without dead ends: 30 [2020-12-22 04:49:36,020 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:49:36,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-22 04:49:36,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-12-22 04:49:36,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-22 04:49:36,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-22 04:49:36,027 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2020-12-22 04:49:36,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:36,027 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-22 04:49:36,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 04:49:36,027 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-22 04:49:36,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-22 04:49:36,045 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:36,046 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-22 04:49:36,246 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:36,247 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:36,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:36,249 INFO L82 PathProgramCache]: Analyzing trace with hash 953965478, now seen corresponding path program 4 times [2020-12-22 04:49:36,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:36,250 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579874070] [2020-12-22 04:49:36,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:36,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:36,369 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-22 04:49:36,370 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579874070] [2020-12-22 04:49:36,371 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069835044] [2020-12-22 04:49:36,372 INFO L93 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 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 [2020-12-22 04:49:36,419 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 04:49:36,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:36,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 04:49:36,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:36,469 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-22 04:49:36,470 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:36,470 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-22 04:49:36,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724325426] [2020-12-22 04:49:36,471 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 04:49:36,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:36,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 04:49:36,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:49:36,472 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-12-22 04:49:36,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:36,504 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-12-22 04:49:36,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 04:49:36,505 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-12-22 04:49:36,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:36,505 INFO L225 Difference]: With dead ends: 50 [2020-12-22 04:49:36,506 INFO L226 Difference]: Without dead ends: 34 [2020-12-22 04:49:36,506 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:49:36,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-22 04:49:36,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-12-22 04:49:36,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-22 04:49:36,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-22 04:49:36,513 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2020-12-22 04:49:36,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:36,514 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-22 04:49:36,514 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 04:49:36,514 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-22 04:49:36,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-22 04:49:36,515 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:36,515 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-22 04:49:36,732 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:36,732 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:36,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:36,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1188152166, now seen corresponding path program 5 times [2020-12-22 04:49:36,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:36,734 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668708149] [2020-12-22 04:49:36,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:36,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:36,807 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-12-22 04:49:36,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668708149] [2020-12-22 04:49:36,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644063552] [2020-12-22 04:49:36,808 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2020-12-22 04:49:36,862 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-22 04:49:36,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:36,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-22 04:49:36,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:36,912 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-12-22 04:49:36,913 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:36,913 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-22 04:49:36,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219753923] [2020-12-22 04:49:36,914 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 04:49:36,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:36,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 04:49:36,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-22 04:49:36,915 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 9 states. [2020-12-22 04:49:36,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:36,948 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-12-22 04:49:36,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 04:49:36,948 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-12-22 04:49:36,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:36,949 INFO L225 Difference]: With dead ends: 54 [2020-12-22 04:49:36,949 INFO L226 Difference]: Without dead ends: 36 [2020-12-22 04:49:36,950 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-22 04:49:36,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-22 04:49:36,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-22 04:49:36,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-22 04:49:36,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-22 04:49:36,956 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-12-22 04:49:36,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:36,956 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-22 04:49:36,956 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 04:49:36,956 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-22 04:49:36,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-22 04:49:36,957 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:36,957 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-22 04:49:37,170 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-22 04:49:37,171 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:37,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:37,172 INFO L82 PathProgramCache]: Analyzing trace with hash 750610982, now seen corresponding path program 6 times [2020-12-22 04:49:37,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:37,172 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652462362] [2020-12-22 04:49:37,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:37,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:37,262 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-22 04:49:37,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652462362] [2020-12-22 04:49:37,263 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675822658] [2020-12-22 04:49:37,263 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:37,298 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2020-12-22 04:49:37,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:37,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-22 04:49:37,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:37,350 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-22 04:49:37,351 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:37,351 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-22 04:49:37,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136624494] [2020-12-22 04:49:37,352 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 04:49:37,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:37,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 04:49:37,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-22 04:49:37,353 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 6 states. [2020-12-22 04:49:37,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:37,374 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2020-12-22 04:49:37,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 04:49:37,375 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2020-12-22 04:49:37,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:37,376 INFO L225 Difference]: With dead ends: 68 [2020-12-22 04:49:37,376 INFO L226 Difference]: Without dead ends: 65 [2020-12-22 04:49:37,377 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-22 04:49:37,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-12-22 04:49:37,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 51. [2020-12-22 04:49:37,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-22 04:49:37,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-12-22 04:49:37,385 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 35 [2020-12-22 04:49:37,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:37,385 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-12-22 04:49:37,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 04:49:37,386 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-12-22 04:49:37,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-22 04:49:37,387 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:37,387 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 1, 1, 1, 1, 1] [2020-12-22 04:49:37,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:37,603 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:37,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:37,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1549796206, now seen corresponding path program 7 times [2020-12-22 04:49:37,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:37,605 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797344685] [2020-12-22 04:49:37,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:37,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:37,726 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-12-22 04:49:37,726 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797344685] [2020-12-22 04:49:37,727 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070505593] [2020-12-22 04:49:37,727 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:37,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:37,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-22 04:49:37,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-12-22 04:49:37,873 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:37,873 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-22 04:49:37,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158057250] [2020-12-22 04:49:37,874 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 04:49:37,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:37,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 04:49:37,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:49:37,875 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 7 states. [2020-12-22 04:49:37,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:37,903 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2020-12-22 04:49:37,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 04:49:37,903 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 50 [2020-12-22 04:49:37,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:37,904 INFO L225 Difference]: With dead ends: 83 [2020-12-22 04:49:37,904 INFO L226 Difference]: Without dead ends: 80 [2020-12-22 04:49:37,905 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:49:37,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-22 04:49:37,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 66. [2020-12-22 04:49:37,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-22 04:49:37,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2020-12-22 04:49:37,915 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 50 [2020-12-22 04:49:37,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:37,916 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2020-12-22 04:49:37,916 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 04:49:37,916 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2020-12-22 04:49:37,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-22 04:49:37,918 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:37,918 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 4, 4, 4, 1, 1, 1, 1, 1] [2020-12-22 04:49:38,131 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:38,132 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:38,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:38,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1394520358, now seen corresponding path program 8 times [2020-12-22 04:49:38,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:38,134 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074045634] [2020-12-22 04:49:38,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:38,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:38,228 INFO L134 CoverageAnalysis]: Checked inductivity of 670 backedges. 0 proven. 526 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-22 04:49:38,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074045634] [2020-12-22 04:49:38,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576844322] [2020-12-22 04:49:38,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:38,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 04:49:38,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:38,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 04:49:38,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:38,384 INFO L134 CoverageAnalysis]: Checked inductivity of 670 backedges. 0 proven. 526 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-22 04:49:38,385 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:49:38,385 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-22 04:49:38,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723704695] [2020-12-22 04:49:38,386 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 04:49:38,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:38,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 04:49:38,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:49:38,387 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 8 states. [2020-12-22 04:49:38,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:38,428 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-12-22 04:49:38,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 04:49:38,429 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 65 [2020-12-22 04:49:38,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:38,430 INFO L225 Difference]: With dead ends: 98 [2020-12-22 04:49:38,430 INFO L226 Difference]: Without dead ends: 95 [2020-12-22 04:49:38,431 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:49:38,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-12-22 04:49:38,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 81. [2020-12-22 04:49:38,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-12-22 04:49:38,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 86 transitions. [2020-12-22 04:49:38,443 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 86 transitions. Word has length 65 [2020-12-22 04:49:38,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:38,443 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 86 transitions. [2020-12-22 04:49:38,443 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 04:49:38,443 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 86 transitions. [2020-12-22 04:49:38,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-22 04:49:38,445 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:49:38,445 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 5, 5, 5, 1, 1, 1, 1, 1] [2020-12-22 04:49:38,656 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-22 04:49:38,656 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:49:38,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:49:38,657 INFO L82 PathProgramCache]: Analyzing trace with hash -60302226, now seen corresponding path program 9 times [2020-12-22 04:49:38,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:49:38,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433924743] [2020-12-22 04:49:38,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:49:38,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:49:38,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1055 backedges. 0 proven. 875 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2020-12-22 04:49:38,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433924743] [2020-12-22 04:49:38,783 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279941904] [2020-12-22 04:49:38,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:38,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-22 04:49:38,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:49:38,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-22 04:49:38,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:49:39,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1055 backedges. 360 proven. 0 refuted. 0 times theorem prover too weak. 695 trivial. 0 not checked. [2020-12-22 04:49:39,062 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-22 04:49:39,062 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 13 [2020-12-22 04:49:39,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523457897] [2020-12-22 04:49:39,062 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 04:49:39,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:49:39,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 04:49:39,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2020-12-22 04:49:39,064 INFO L87 Difference]: Start difference. First operand 81 states and 86 transitions. Second operand 8 states. [2020-12-22 04:49:39,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:49:39,091 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2020-12-22 04:49:39,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 04:49:39,091 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 80 [2020-12-22 04:49:39,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:49:39,092 INFO L225 Difference]: With dead ends: 81 [2020-12-22 04:49:39,092 INFO L226 Difference]: Without dead ends: 0 [2020-12-22 04:49:39,093 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2020-12-22 04:49:39,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-22 04:49:39,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-22 04:49:39,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-22 04:49:39,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-22 04:49:39,093 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 80 [2020-12-22 04:49:39,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:49:39,094 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-22 04:49:39,094 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 04:49:39,094 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-22 04:49:39,094 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-22 04:49:39,304 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:49:39,308 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-22 04:49:39,467 WARN L197 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 23 [2020-12-22 04:49:39,516 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-22 04:49:39,516 INFO L189 CegarLoopUtils]: For program point L25-1(lines 25 27) no Hoare annotation was computed. [2020-12-22 04:49:39,516 INFO L189 CegarLoopUtils]: For program point L21-2(lines 21 23) no Hoare annotation was computed. [2020-12-22 04:49:39,517 INFO L185 CegarLoopUtils]: At program point L21-3(lines 21 23) the Hoare annotation is: (and (< ULTIMATE.start_main_~b~0 7) (<= ULTIMATE.start_main_~a~0 5)) [2020-12-22 04:49:39,517 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-22 04:49:39,517 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-22 04:49:39,517 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-22 04:49:39,517 INFO L192 CegarLoopUtils]: At program point L28(lines 15 29) the Hoare annotation is: true [2020-12-22 04:49:39,517 INFO L189 CegarLoopUtils]: For program point L26(line 26) no Hoare annotation was computed. [2020-12-22 04:49:39,517 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 26) no Hoare annotation was computed. [2020-12-22 04:49:39,517 INFO L189 CegarLoopUtils]: For program point L20-2(lines 20 24) no Hoare annotation was computed. [2020-12-22 04:49:39,518 INFO L185 CegarLoopUtils]: At program point L20-3(lines 20 24) the Hoare annotation is: (and (<= ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 7) (<= 6 ULTIMATE.start_main_~b~0)) [2020-12-22 04:49:39,518 INFO L189 CegarLoopUtils]: For program point L20-4(lines 15 29) no Hoare annotation was computed. [2020-12-22 04:49:39,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 04:49:39 BoogieIcfgContainer [2020-12-22 04:49:39,534 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 04:49:39,535 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 04:49:39,535 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 04:49:39,535 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 04:49:39,536 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:49:34" (3/4) ... [2020-12-22 04:49:39,541 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-22 04:49:39,551 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2020-12-22 04:49:39,552 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-22 04:49:39,552 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 04:49:39,552 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 04:49:39,585 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loop-simple/nested_2.c-witness.graphml [2020-12-22 04:49:39,585 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 04:49:39,586 INFO L168 Benchmark]: Toolchain (without parser) took 6110.36 ms. Allocated memory was 151.0 MB in the beginning and 195.0 MB in the end (delta: 44.0 MB). Free memory was 125.5 MB in the beginning and 138.7 MB in the end (delta: -13.2 MB). Peak memory consumption was 31.6 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,587 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 123.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 04:49:39,588 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.22 ms. Allocated memory is still 151.0 MB. Free memory was 125.3 MB in the beginning and 116.3 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,588 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.85 ms. Allocated memory is still 151.0 MB. Free memory was 116.3 MB in the beginning and 114.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,589 INFO L168 Benchmark]: Boogie Preprocessor took 36.87 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 113.9 MB in the end (delta: 840.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,590 INFO L168 Benchmark]: RCFGBuilder took 315.65 ms. Allocated memory is still 151.0 MB. Free memory was 113.7 MB in the beginning and 102.6 MB in the end (delta: 11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,591 INFO L168 Benchmark]: TraceAbstraction took 5331.34 ms. Allocated memory was 151.0 MB in the beginning and 195.0 MB in the end (delta: 44.0 MB). Free memory was 102.2 MB in the beginning and 140.8 MB in the end (delta: -38.5 MB). Peak memory consumption was 6.4 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,591 INFO L168 Benchmark]: Witness Printer took 50.24 ms. Allocated memory is still 195.0 MB. Free memory was 140.8 MB in the beginning and 138.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 04:49:39,595 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 123.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 317.22 ms. Allocated memory is still 151.0 MB. Free memory was 125.3 MB in the beginning and 116.3 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 44.85 ms. Allocated memory is still 151.0 MB. Free memory was 116.3 MB in the beginning and 114.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.87 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 113.9 MB in the end (delta: 840.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 315.65 ms. Allocated memory is still 151.0 MB. Free memory was 113.7 MB in the beginning and 102.6 MB in the end (delta: 11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5331.34 ms. Allocated memory was 151.0 MB in the beginning and 195.0 MB in the end (delta: 44.0 MB). Free memory was 102.2 MB in the beginning and 140.8 MB in the end (delta: -38.5 MB). Peak memory consumption was 6.4 MB. Max. memory is 8.0 GB. * Witness Printer took 50.24 ms. Allocated memory is still 195.0 MB. Free memory was 140.8 MB in the beginning and 138.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 26]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: (a <= 6 && b < 7) && 6 <= b - InvariantResult [Line: 15]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: b < 7 && a <= 5 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5.0s, OverallIterations: 11, TraceHistogramMax: 30, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 84 SDtfs, 98 SDslu, 159 SDs, 0 SdLazy, 218 SolverSat, 22 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 393 GetRequests, 332 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=10, 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, 11 MinimizatonAttempts, 62 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 45 NumberOfFragments, 18 HoareAnnotationTreeSize, 3 FomulaSimplifications, 1545 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 3 FomulaSimplificationsInter, 62 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 679 NumberOfCodeBlocks, 604 NumberOfCodeBlocksAsserted, 57 NumberOfCheckSat, 659 ConstructedInterpolants, 0 QuantifiedInterpolants, 81577 SizeOfPredicates, 2 NumberOfNonLiveVariables, 634 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 20 InterpolantComputations, 3 PerfectInterpolantSequences, 2269/5009 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...