/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 21:47:35,759 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 21:47:35,762 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 21:47:35,798 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 21:47:35,812 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 21:47:35,826 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 21:47:35,828 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 21:47:35,834 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 21:47:35,835 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 21:47:35,836 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 21:47:35,842 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 21:47:35,849 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 21:47:35,854 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 21:47:35,859 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 21:47:35,861 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 21:47:35,862 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 21:47:35,868 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 21:47:35,887 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 21:47:35,912 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 21:47:35,912 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 21:47:35,918 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 21:47:35,918 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 21:47:35,918 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 21:47:35,918 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 21:47:35,919 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 21:47:35,919 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 21:47:35,919 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 21:47:35,919 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 21:47:35,920 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 21:47:35,921 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 21:47:35,921 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 21:47:35,921 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 21:47:35,921 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 21:47:35,922 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 21:47:35,922 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 21:47:35,922 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 21:47:35,922 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 21:47:35,922 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 21:47:35,922 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 21:47:35,923 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 21:47:35,923 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 21:47:36,336 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 21:47:36,390 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 21:47:36,394 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 21:47:36,396 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 21:47:36,396 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 21:47:36,398 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-10-23 21:47:36,486 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f549158c3/0bb4bbad213e4cc3a9a19a9f0ce45238/FLAG04e734f08 [2020-10-23 21:47:37,130 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 21:47:37,131 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-10-23 21:47:37,138 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f549158c3/0bb4bbad213e4cc3a9a19a9f0ce45238/FLAG04e734f08 [2020-10-23 21:47:37,511 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f549158c3/0bb4bbad213e4cc3a9a19a9f0ce45238 [2020-10-23 21:47:37,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 21:47:37,525 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 21:47:37,527 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:37,527 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 21:47:37,531 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 21:47:37,532 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,536 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@557941f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37, skipping insertion in model container [2020-10-23 21:47:37,536 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,545 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 21:47:37,560 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 21:47:37,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:37,729 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 21:47:37,746 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:37,765 INFO L208 MainTranslator]: Completed translation [2020-10-23 21:47:37,766 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37 WrapperNode [2020-10-23 21:47:37,766 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:37,767 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 21:47:37,768 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 21:47:37,768 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 21:47:37,783 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,783 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,792 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,792 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,798 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,803 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,804 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (1/1) ... [2020-10-23 21:47:37,807 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 21:47:37,808 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 21:47:37,808 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 21:47:37,808 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 21:47:37,809 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (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 [2020-10-23 21:47:37,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 21:47:37,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 21:47:37,907 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 21:47:37,907 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 21:47:37,907 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 21:47:37,908 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 21:47:37,908 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 21:47:37,908 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 21:47:37,909 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 21:47:37,909 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 21:47:37,910 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 21:47:37,910 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 21:47:37,910 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 21:47:37,911 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 21:47:37,911 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 21:47:37,911 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 21:47:37,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 21:47:38,425 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 21:47:38,426 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 21:47:38,429 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:38 BoogieIcfgContainer [2020-10-23 21:47:38,430 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 21:47:38,434 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 21:47:38,438 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 21:47:38,442 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 21:47:38,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:47:37" (1/3) ... [2020-10-23 21:47:38,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@179853ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:38, skipping insertion in model container [2020-10-23 21:47:38,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:37" (2/3) ... [2020-10-23 21:47:38,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@179853ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:38, skipping insertion in model container [2020-10-23 21:47:38,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:38" (3/3) ... [2020-10-23 21:47:38,447 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-10-23 21:47:38,461 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 21:47:38,467 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 21:47:38,482 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 21:47:38,523 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 21:47:38,524 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 21:47:38,524 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 21:47:38,524 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 21:47:38,524 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 21:47:38,524 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 21:47:38,524 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 21:47:38,524 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 21:47:38,568 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-10-23 21:47:38,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-23 21:47:38,578 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:38,579 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:38,579 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:38,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:38,587 INFO L82 PathProgramCache]: Analyzing trace with hash -772490682, now seen corresponding path program 1 times [2020-10-23 21:47:38,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:38,596 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142869943] [2020-10-23 21:47:38,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:38,677 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:38,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:38,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:38,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:38,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:38,948 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142869943] [2020-10-23 21:47:38,950 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:38,950 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 21:47:38,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417259587] [2020-10-23 21:47:38,957 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 21:47:38,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:38,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 21:47:38,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 21:47:38,982 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 4 states. [2020-10-23 21:47:39,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:39,313 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-10-23 21:47:39,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 21:47:39,318 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-23 21:47:39,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:39,336 INFO L225 Difference]: With dead ends: 49 [2020-10-23 21:47:39,337 INFO L226 Difference]: Without dead ends: 28 [2020-10-23 21:47:39,343 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 21:47:39,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-23 21:47:39,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-10-23 21:47:39,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-23 21:47:39,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-10-23 21:47:39,426 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 20 [2020-10-23 21:47:39,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:39,427 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-10-23 21:47:39,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 21:47:39,428 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-10-23 21:47:39,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 21:47:39,430 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:39,430 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:39,430 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 21:47:39,431 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:39,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:39,432 INFO L82 PathProgramCache]: Analyzing trace with hash 515607529, now seen corresponding path program 1 times [2020-10-23 21:47:39,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:39,432 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699261917] [2020-10-23 21:47:39,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:39,690 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:39,709 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:39,712 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:39,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:39,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:39,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:39,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:39,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699261917] [2020-10-23 21:47:39,989 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:39,990 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 21:47:39,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959369916] [2020-10-23 21:47:39,993 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 21:47:39,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:39,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 21:47:39,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-23 21:47:39,996 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 6 states. [2020-10-23 21:47:40,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:40,280 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-10-23 21:47:40,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-23 21:47:40,281 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-10-23 21:47:40,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:40,282 INFO L225 Difference]: With dead ends: 39 [2020-10-23 21:47:40,282 INFO L226 Difference]: Without dead ends: 33 [2020-10-23 21:47:40,284 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2020-10-23 21:47:40,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-23 21:47:40,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-10-23 21:47:40,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-23 21:47:40,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-10-23 21:47:40,297 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 25 [2020-10-23 21:47:40,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:40,297 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-10-23 21:47:40,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 21:47:40,298 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-10-23 21:47:40,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-23 21:47:40,299 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:40,299 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:40,300 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 21:47:40,300 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:40,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:40,301 INFO L82 PathProgramCache]: Analyzing trace with hash -1732949978, now seen corresponding path program 2 times [2020-10-23 21:47:40,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:40,301 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935762491] [2020-10-23 21:47:40,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:40,802 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:40,943 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:40,947 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:40,950 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:40,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:41,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:41,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:41,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:41,179 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935762491] [2020-10-23 21:47:41,179 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:41,179 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-23 21:47:41,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528660508] [2020-10-23 21:47:41,180 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 21:47:41,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:41,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 21:47:41,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-10-23 21:47:41,182 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 8 states. [2020-10-23 21:47:41,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:41,565 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-10-23 21:47:41,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 21:47:41,584 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2020-10-23 21:47:41,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:41,586 INFO L225 Difference]: With dead ends: 44 [2020-10-23 21:47:41,586 INFO L226 Difference]: Without dead ends: 38 [2020-10-23 21:47:41,589 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2020-10-23 21:47:41,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-23 21:47:41,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-10-23 21:47:41,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-23 21:47:41,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-10-23 21:47:41,613 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 30 [2020-10-23 21:47:41,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:41,615 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-10-23 21:47:41,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 21:47:41,615 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-10-23 21:47:41,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-23 21:47:41,619 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:41,619 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:41,620 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 21:47:41,620 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:41,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:41,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1450661367, now seen corresponding path program 3 times [2020-10-23 21:47:41,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:41,623 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99826694] [2020-10-23 21:47:41,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:42,154 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:42,311 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:42,316 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:42,321 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:42,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:42,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:42,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:42,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:42,529 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99826694] [2020-10-23 21:47:42,529 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:42,529 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-10-23 21:47:42,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403139708] [2020-10-23 21:47:42,530 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 21:47:42,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:42,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 21:47:42,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-10-23 21:47:42,532 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 10 states. [2020-10-23 21:47:43,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:43,205 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-10-23 21:47:43,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-23 21:47:43,206 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2020-10-23 21:47:43,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:43,207 INFO L225 Difference]: With dead ends: 49 [2020-10-23 21:47:43,207 INFO L226 Difference]: Without dead ends: 43 [2020-10-23 21:47:43,209 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2020-10-23 21:47:43,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-23 21:47:43,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-10-23 21:47:43,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-23 21:47:43,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-10-23 21:47:43,243 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 35 [2020-10-23 21:47:43,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:43,243 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-10-23 21:47:43,243 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 21:47:43,243 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-10-23 21:47:43,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-23 21:47:43,245 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:43,245 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:43,245 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 21:47:43,246 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:43,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:43,248 INFO L82 PathProgramCache]: Analyzing trace with hash 772144646, now seen corresponding path program 4 times [2020-10-23 21:47:43,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:43,248 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615378166] [2020-10-23 21:47:43,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:43,370 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:43,503 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:43,640 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:43,802 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:43,962 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:43,965 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:43,969 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:43,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:44,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:44,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:44,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:44,234 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615378166] [2020-10-23 21:47:44,234 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:44,234 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-10-23 21:47:44,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615189377] [2020-10-23 21:47:44,235 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 21:47:44,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:44,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 21:47:44,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2020-10-23 21:47:44,236 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 12 states. [2020-10-23 21:47:45,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:45,051 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-10-23 21:47:45,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-23 21:47:45,051 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-10-23 21:47:45,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:45,053 INFO L225 Difference]: With dead ends: 54 [2020-10-23 21:47:45,053 INFO L226 Difference]: Without dead ends: 48 [2020-10-23 21:47:45,054 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2020-10-23 21:47:45,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-23 21:47:45,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-10-23 21:47:45,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-23 21:47:45,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-10-23 21:47:45,069 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 40 [2020-10-23 21:47:45,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:45,070 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-10-23 21:47:45,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 21:47:45,070 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-10-23 21:47:45,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-23 21:47:45,072 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:45,072 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:45,072 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 21:47:45,072 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:45,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:45,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1100914729, now seen corresponding path program 5 times [2020-10-23 21:47:45,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:45,074 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752352749] [2020-10-23 21:47:45,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:45,443 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:45,596 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:45,751 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:45,752 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:45,754 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:45,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:46,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:46,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:46,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:46,062 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752352749] [2020-10-23 21:47:46,062 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:46,063 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2020-10-23 21:47:46,063 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169346491] [2020-10-23 21:47:46,063 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-23 21:47:46,064 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:46,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-23 21:47:46,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-10-23 21:47:46,065 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 14 states. [2020-10-23 21:47:47,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:47,126 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-10-23 21:47:47,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-23 21:47:47,126 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 45 [2020-10-23 21:47:47,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:47,128 INFO L225 Difference]: With dead ends: 59 [2020-10-23 21:47:47,128 INFO L226 Difference]: Without dead ends: 53 [2020-10-23 21:47:47,130 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2020-10-23 21:47:47,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-23 21:47:47,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2020-10-23 21:47:47,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-23 21:47:47,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-10-23 21:47:47,146 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 45 [2020-10-23 21:47:47,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:47,146 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-10-23 21:47:47,146 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-23 21:47:47,147 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-10-23 21:47:47,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-23 21:47:47,148 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:47,148 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:47,148 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 21:47:47,149 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:47,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:47,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1507122150, now seen corresponding path program 6 times [2020-10-23 21:47:47,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:47,150 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009375194] [2020-10-23 21:47:47,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:47,280 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:47,424 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:47,549 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:47,699 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:47,843 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:47,846 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:47,847 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:47,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 21:47:47,874 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 21:47:47,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 21:47:47,902 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 21:47:47,945 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 21:47:47,945 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 21:47:47,946 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-23 21:47:47,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 09:47:47 BoogieIcfgContainer [2020-10-23 21:47:47,962 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 21:47:47,965 INFO L168 Benchmark]: Toolchain (without parser) took 10444.69 ms. Allocated memory was 161.5 MB in the beginning and 232.8 MB in the end (delta: 71.3 MB). Free memory was 138.5 MB in the beginning and 108.0 MB in the end (delta: 30.5 MB). Peak memory consumption was 102.8 MB. Max. memory is 8.0 GB. [2020-10-23 21:47:47,965 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 161.5 MB. Free memory is still 134.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 21:47:47,966 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.08 ms. Allocated memory is still 161.5 MB. Free memory was 137.9 MB in the beginning and 128.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 21:47:47,967 INFO L168 Benchmark]: Boogie Preprocessor took 39.38 ms. Allocated memory is still 161.5 MB. Free memory was 128.4 MB in the beginning and 127.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 21:47:47,968 INFO L168 Benchmark]: RCFGBuilder took 622.87 ms. Allocated memory is still 161.5 MB. Free memory was 126.9 MB in the beginning and 114.4 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 21:47:47,969 INFO L168 Benchmark]: TraceAbstraction took 9528.17 ms. Allocated memory was 161.5 MB in the beginning and 232.8 MB in the end (delta: 71.3 MB). Free memory was 113.9 MB in the beginning and 108.0 MB in the end (delta: 5.9 MB). Peak memory consumption was 77.6 MB. Max. memory is 8.0 GB. [2020-10-23 21:47:47,973 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 161.5 MB. Free memory is still 134.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 240.08 ms. Allocated memory is still 161.5 MB. Free memory was 137.9 MB in the beginning and 128.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.38 ms. Allocated memory is still 161.5 MB. Free memory was 128.4 MB in the beginning and 127.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 622.87 ms. Allocated memory is still 161.5 MB. Free memory was 126.9 MB in the beginning and 114.4 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 9528.17 ms. Allocated memory was 161.5 MB in the beginning and 232.8 MB in the end (delta: 71.3 MB). Free memory was 113.9 MB in the beginning and 108.0 MB in the end (delta: 5.9 MB). Peak memory consumption was 77.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L21] CALL __VERIFIER_assert(y != 64) [L6] COND TRUE !(cond) [L7] CALL reach_error() [L3] __assert_fail("0", "underapprox_1-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.4s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 3.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 198 SDslu, 469 SDs, 0 SdLazy, 740 SolverSat, 63 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 111 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 incorrect! Received shutdown request...