/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-acceleration/simple_3-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 04:26:53,398 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 04:26:53,402 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 04:26:53,460 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-22 04:26:53,489 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 04:26:53,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 04:26:53,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 04:26:53,497 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 04:26:53,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 04:26:53,501 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 04:26:53,508 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 04:26:53,518 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 04:26:53,520 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 04:26:53,522 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 04:26:53,524 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 04:26:53,527 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 04:26:53,535 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 04:26:53,548 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 04:26:53,549 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 04:26:53,549 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 04:26:53,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 04:26:53,604 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 04:26:53,604 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 04:26:53,609 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 04:26:53,610 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 04:26:53,610 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 04:26:53,610 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 04:26:53,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 04:26:53,610 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 04:26:53,611 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 04:26:53,611 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 04:26:53,612 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 04:26:53,613 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 04:26:53,613 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 04:26:53,613 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 04:26:53,613 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 04:26:53,614 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 04:26:53,614 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 04:26:53,614 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 04:26:53,614 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 04:26:53,614 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 04:26:53,615 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 04:26:53,615 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 04:26:53,615 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 04:26:53,617 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 04:26:53,617 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 04:26:53,618 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 04:26:54,065 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 04:26:54,101 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 04:26:54,104 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 04:26:54,106 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 04:26:54,107 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 04:26:54,108 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/simple_3-2.c [2020-12-22 04:26:54,210 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/10c09308c/61d4340568aa4618b791ba385dbff55e/FLAG006ebfdcd [2020-12-22 04:26:54,845 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 04:26:54,846 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/simple_3-2.c [2020-12-22 04:26:54,854 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/10c09308c/61d4340568aa4618b791ba385dbff55e/FLAG006ebfdcd [2020-12-22 04:26:55,192 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/10c09308c/61d4340568aa4618b791ba385dbff55e [2020-12-22 04:26:55,195 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 04:26:55,198 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 04:26:55,200 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 04:26:55,200 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 04:26:55,204 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 04:26:55,205 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,206 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ead2a6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55, skipping insertion in model container [2020-12-22 04:26:55,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,215 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 04:26:55,230 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 04:26:55,380 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-acceleration/simple_3-2.c[376,389] [2020-12-22 04:26:55,392 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:26:55,403 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 04:26:55,418 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-acceleration/simple_3-2.c[376,389] [2020-12-22 04:26:55,421 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:26:55,436 INFO L208 MainTranslator]: Completed translation [2020-12-22 04:26:55,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55 WrapperNode [2020-12-22 04:26:55,436 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 04:26:55,438 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 04:26:55,438 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 04:26:55,438 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 04:26:55,446 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,453 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,473 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 04:26:55,474 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 04:26:55,474 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 04:26:55,475 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 04:26:55,484 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,484 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,485 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,486 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,489 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,493 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,495 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (1/1) ... [2020-12-22 04:26:55,496 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 04:26:55,498 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 04:26:55,498 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 04:26:55,498 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 04:26:55,499 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (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 04:26:55,599 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 04:26:55,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 04:26:55,599 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 04:26:55,600 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 04:26:55,839 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 04:26:55,840 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-22 04:26:55,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:26:55 BoogieIcfgContainer [2020-12-22 04:26:55,845 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 04:26:55,850 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 04:26:55,850 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 04:26:55,857 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 04:26:55,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:26:55" (1/3) ... [2020-12-22 04:26:55,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@dcf007d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:26:55, skipping insertion in model container [2020-12-22 04:26:55,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:26:55" (2/3) ... [2020-12-22 04:26:55,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@dcf007d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:26:55, skipping insertion in model container [2020-12-22 04:26:55,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:26:55" (3/3) ... [2020-12-22 04:26:55,865 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_3-2.c [2020-12-22 04:26:55,881 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 04:26:55,895 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 04:26:55,951 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 04:26:56,022 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 04:26:56,023 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 04:26:56,023 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 04:26:56,023 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 04:26:56,023 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 04:26:56,023 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 04:26:56,023 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 04:26:56,024 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 04:26:56,059 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2020-12-22 04:26:56,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-22 04:26:56,072 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:26:56,072 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-22 04:26:56,076 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:26:56,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:26:56,090 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2020-12-22 04:26:56,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:26:56,116 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583395397] [2020-12-22 04:26:56,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:26:56,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:26:56,476 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 04:26:56,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583395397] [2020-12-22 04:26:56,478 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 04:26:56,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-22 04:26:56,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392698065] [2020-12-22 04:26:56,488 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-22 04:26:56,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:26:56,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-22 04:26:56,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-22 04:26:56,511 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 4 states. [2020-12-22 04:26:56,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:26:56,585 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2020-12-22 04:26:56,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 04:26:56,587 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2020-12-22 04:26:56,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:26:56,597 INFO L225 Difference]: With dead ends: 23 [2020-12-22 04:26:56,597 INFO L226 Difference]: Without dead ends: 8 [2020-12-22 04:26:56,600 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-22 04:26:56,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-22 04:26:56,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-22 04:26:56,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-22 04:26:56,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-12-22 04:26:56,635 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2020-12-22 04:26:56,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:26:56,635 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-12-22 04:26:56,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-22 04:26:56,636 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-12-22 04:26:56,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-22 04:26:56,636 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:26:56,636 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:26:56,637 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 04:26:56,637 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:26:56,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:26:56,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2020-12-22 04:26:56,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:26:56,639 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353465651] [2020-12-22 04:26:56,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:26:56,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:26:56,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:26:56,767 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353465651] [2020-12-22 04:26:56,768 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745795282] [2020-12-22 04:26:56,769 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 04:26:56,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:26:56,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-22 04:26:56,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:26:56,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:26:56,920 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:26:56,920 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2020-12-22 04:26:56,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494525740] [2020-12-22 04:26:56,924 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 04:26:56,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:26:56,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 04:26:56,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:26:56,941 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2020-12-22 04:26:57,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:26:57,044 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2020-12-22 04:26:57,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 04:26:57,045 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-12-22 04:26:57,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:26:57,045 INFO L225 Difference]: With dead ends: 11 [2020-12-22 04:26:57,046 INFO L226 Difference]: Without dead ends: 0 [2020-12-22 04:26:57,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-12-22 04:26:57,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-22 04:26:57,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-22 04:26:57,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-22 04:26:57,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-22 04:26:57,048 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 7 [2020-12-22 04:26:57,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:26:57,049 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-22 04:26:57,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 04:26:57,049 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-22 04:26:57,049 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-22 04:26:57,264 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-22 04:26:57,268 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-22 04:26:57,305 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-22 04:26:57,305 INFO L185 CegarLoopUtils]: At program point L17-2(lines 17 19) the Hoare annotation is: (or (let ((.cse0 (div ULTIMATE.start_main_~x~0 2))) (and (< 0 .cse0) (<= ULTIMATE.start_main_~x~0 (* 2 .cse0)))) (= ULTIMATE.start_main_~x~0 0)) [2020-12-22 04:26:57,305 INFO L189 CegarLoopUtils]: For program point L17-3(lines 17 19) no Hoare annotation was computed. [2020-12-22 04:26:57,306 INFO L189 CegarLoopUtils]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-12-22 04:26:57,306 INFO L185 CegarLoopUtils]: At program point L7-2(lines 1 22) the Hoare annotation is: (not (= 0 ULTIMATE.start___VERIFIER_assert_~cond)) [2020-12-22 04:26:57,306 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-22 04:26:57,306 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-22 04:26:57,306 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-22 04:26:57,306 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-12-22 04:26:57,307 INFO L189 CegarLoopUtils]: For program point L8(line 8) no Hoare annotation was computed. [2020-12-22 04:26:57,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 04:26:57 BoogieIcfgContainer [2020-12-22 04:26:57,341 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 04:26:57,342 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 04:26:57,342 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 04:26:57,342 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 04:26:57,343 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:26:55" (3/4) ... [2020-12-22 04:26:57,347 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-22 04:26:57,359 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2020-12-22 04:26:57,359 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-22 04:26:57,360 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 04:26:57,360 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 04:26:57,409 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loop-acceleration/simple_3-2.c-witness.graphml [2020-12-22 04:26:57,409 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 04:26:57,412 INFO L168 Benchmark]: Toolchain (without parser) took 2213.23 ms. Allocated memory is still 152.0 MB. Free memory was 127.8 MB in the beginning and 131.0 MB in the end (delta: -3.2 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 04:26:57,413 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 152.0 MB. Free memory was 136.0 MB in the beginning and 135.9 MB in the end (delta: 110.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 04:26:57,414 INFO L168 Benchmark]: CACSL2BoogieTranslator took 237.31 ms. Allocated memory is still 152.0 MB. Free memory was 127.6 MB in the beginning and 118.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 04:26:57,414 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.73 ms. Allocated memory is still 152.0 MB. Free memory was 118.3 MB in the beginning and 117.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 04:26:57,415 INFO L168 Benchmark]: Boogie Preprocessor took 22.44 ms. Allocated memory is still 152.0 MB. Free memory was 117.0 MB in the beginning and 116.0 MB in the end (delta: 914.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 04:26:57,416 INFO L168 Benchmark]: RCFGBuilder took 347.43 ms. Allocated memory is still 152.0 MB. Free memory was 115.9 MB in the beginning and 104.8 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2020-12-22 04:26:57,417 INFO L168 Benchmark]: TraceAbstraction took 1491.33 ms. Allocated memory is still 152.0 MB. Free memory was 104.3 MB in the beginning and 134.1 MB in the end (delta: -29.7 MB). Peak memory consumption was 17.9 MB. Max. memory is 8.0 GB. [2020-12-22 04:26:57,418 INFO L168 Benchmark]: Witness Printer took 67.82 ms. Allocated memory is still 152.0 MB. Free memory was 134.1 MB in the beginning and 131.0 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-22 04:26:57,422 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 152.0 MB. Free memory was 136.0 MB in the beginning and 135.9 MB in the end (delta: 110.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 237.31 ms. Allocated memory is still 152.0 MB. Free memory was 127.6 MB in the beginning and 118.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 35.73 ms. Allocated memory is still 152.0 MB. Free memory was 118.3 MB in the beginning and 117.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 22.44 ms. Allocated memory is still 152.0 MB. Free memory was 117.0 MB in the beginning and 116.0 MB in the end (delta: 914.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 347.43 ms. Allocated memory is still 152.0 MB. Free memory was 115.9 MB in the beginning and 104.8 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1491.33 ms. Allocated memory is still 152.0 MB. Free memory was 104.3 MB in the beginning and 134.1 MB in the end (delta: -29.7 MB). Peak memory consumption was 17.9 MB. Max. memory is 8.0 GB. * Witness Printer took 67.82 ms. Allocated memory is still 152.0 MB. Free memory was 134.1 MB in the beginning and 131.0 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: 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: 17]: Loop Invariant Derived loop invariant: (0 < x / 2 && x <= 2 * (x / 2)) || x == 0 - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: !(0 == cond) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1.2s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 8 SDtfs, 11 SDslu, 14 SDs, 0 SdLazy, 27 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=10occurred in iteration=0, 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, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 6 NumberOfFragments, 21 HoareAnnotationTreeSize, 2 FomulaSimplifications, 9 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 2 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 20 NumberOfCodeBlocks, 20 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 17 ConstructedInterpolants, 0 QuantifiedInterpolants, 354 SizeOfPredicates, 2 NumberOfNonLiveVariables, 46 ConjunctsInSsa, 10 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 0/2 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...