/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_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 21:47:50,751 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 21:47:50,761 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 21:47:50,819 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 21:47:50,820 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 21:47:50,826 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 21:47:50,830 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 21:47:50,839 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 21:47:50,843 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 21:47:50,851 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 21:47:50,853 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 21:47:50,855 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 21:47:50,855 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 21:47:50,858 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 21:47:50,860 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 21:47:50,862 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 21:47:50,863 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 21:47:50,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 21:47:50,874 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 21:47:50,882 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 21:47:50,884 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 21:47:50,886 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 21:47:50,889 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 21:47:50,891 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 21:47:50,899 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 21:47:50,921 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 21:47:50,923 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 21:47:50,923 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 21:47:50,925 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 21:47:50,949 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 21:47:50,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 21:47:50,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 21:47:50,954 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 21:47:50,955 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 21:47:50,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 21:47:50,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 21:47:50,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 21:47:50,955 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 21:47:50,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 21:47:50,957 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 21:47:50,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 21:47:50,957 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 21:47:50,958 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 21:47:50,958 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 21:47:50,958 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 21:47:50,959 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 21:47:50,959 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 21:47:50,959 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 21:47:50,959 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 21:47:50,959 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 21:47:50,960 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 21:47:50,960 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 21:47:51,479 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 21:47:51,507 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 21:47:51,511 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 21:47:51,512 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 21:47:51,513 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 21:47:51,514 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-10-23 21:47:51,610 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce1488ca3/63e5899792f54682be88242564c95dbb/FLAG44436f871 [2020-10-23 21:47:52,386 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 21:47:52,386 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-10-23 21:47:52,394 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce1488ca3/63e5899792f54682be88242564c95dbb/FLAG44436f871 [2020-10-23 21:47:52,727 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce1488ca3/63e5899792f54682be88242564c95dbb [2020-10-23 21:47:52,731 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 21:47:52,739 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 21:47:52,741 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:52,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 21:47:52,745 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 21:47:52,747 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:52" (1/1) ... [2020-10-23 21:47:52,750 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38d5935a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:52, skipping insertion in model container [2020-10-23 21:47:52,751 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:52" (1/1) ... [2020-10-23 21:47:52,760 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 21:47:52,775 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 21:47:52,982 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:52,994 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 21:47:53,011 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:53,028 INFO L208 MainTranslator]: Completed translation [2020-10-23 21:47:53,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53 WrapperNode [2020-10-23 21:47:53,029 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:53,030 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 21:47:53,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 21:47:53,031 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 21:47:53,045 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,045 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,060 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,065 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,066 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ... [2020-10-23 21:47:53,068 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 21:47:53,070 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 21:47:53,070 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 21:47:53,070 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 21:47:53,071 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (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 21:47:53,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 21:47:53,157 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 21:47:53,157 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 21:47:53,157 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 21:47:53,157 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 21:47:53,157 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 21:47:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 21:47:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 21:47:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 21:47:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 21:47:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 21:47:53,581 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 21:47:53,582 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 21:47:53,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:53 BoogieIcfgContainer [2020-10-23 21:47:53,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 21:47:53,594 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 21:47:53,596 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 21:47:53,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 21:47:53,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:47:52" (1/3) ... [2020-10-23 21:47:53,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139e2fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:53, skipping insertion in model container [2020-10-23 21:47:53,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (2/3) ... [2020-10-23 21:47:53,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139e2fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:53, skipping insertion in model container [2020-10-23 21:47:53,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:53" (3/3) ... [2020-10-23 21:47:53,607 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-10-23 21:47:53,623 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 21:47:53,630 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 21:47:53,649 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 21:47:53,703 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 21:47:53,704 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 21:47:53,704 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 21:47:53,704 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 21:47:53,704 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 21:47:53,704 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 21:47:53,705 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 21:47:53,705 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 21:47:53,731 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-10-23 21:47:53,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-23 21:47:53,747 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:53,748 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 21:47:53,749 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:53,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:53,764 INFO L82 PathProgramCache]: Analyzing trace with hash -772490682, now seen corresponding path program 1 times [2020-10-23 21:47:53,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:53,787 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612542686] [2020-10-23 21:47:53,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:53,884 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:54,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:54,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:54,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:54,365 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 21:47:54,367 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612542686] [2020-10-23 21:47:54,370 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:54,371 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 21:47:54,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725768790] [2020-10-23 21:47:54,378 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 21:47:54,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:54,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 21:47:54,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 21:47:54,399 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 6 states. [2020-10-23 21:47:54,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:54,670 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-10-23 21:47:54,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-23 21:47:54,673 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-10-23 21:47:54,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:54,682 INFO L225 Difference]: With dead ends: 49 [2020-10-23 21:47:54,682 INFO L226 Difference]: Without dead ends: 28 [2020-10-23 21:47:54,686 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-10-23 21:47:54,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-23 21:47:54,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-10-23 21:47:54,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-23 21:47:54,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-10-23 21:47:54,769 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 20 [2020-10-23 21:47:54,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:54,770 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-10-23 21:47:54,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 21:47:54,771 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-10-23 21:47:54,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 21:47:54,773 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:54,774 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 21:47:54,774 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 21:47:54,775 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:54,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:54,776 INFO L82 PathProgramCache]: Analyzing trace with hash 515607529, now seen corresponding path program 1 times [2020-10-23 21:47:54,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:54,777 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025431548] [2020-10-23 21:47:54,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:54,950 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:54,968 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:54,970 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:54,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:55,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:55,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:55,137 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 21:47:55,137 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025431548] [2020-10-23 21:47:55,138 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:55,138 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-23 21:47:55,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842338527] [2020-10-23 21:47:55,139 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 21:47:55,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:55,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 21:47:55,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-10-23 21:47:55,141 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2020-10-23 21:47:55,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:55,408 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-10-23 21:47:55,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-23 21:47:55,409 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-10-23 21:47:55,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:55,410 INFO L225 Difference]: With dead ends: 39 [2020-10-23 21:47:55,411 INFO L226 Difference]: Without dead ends: 33 [2020-10-23 21:47:55,412 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-10-23 21:47:55,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-23 21:47:55,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-10-23 21:47:55,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-23 21:47:55,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-10-23 21:47:55,427 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 25 [2020-10-23 21:47:55,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:55,427 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-10-23 21:47:55,427 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 21:47:55,428 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-10-23 21:47:55,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-23 21:47:55,429 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:55,429 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 21:47:55,429 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 21:47:55,430 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:55,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:55,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1732949978, now seen corresponding path program 2 times [2020-10-23 21:47:55,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:55,431 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241645678] [2020-10-23 21:47:55,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:55,693 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:55,955 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:56,103 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:56,106 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:56,108 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:56,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:56,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:56,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:56,348 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 21:47:56,349 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241645678] [2020-10-23 21:47:56,349 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:56,350 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-10-23 21:47:56,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455791919] [2020-10-23 21:47:56,350 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 21:47:56,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:56,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 21:47:56,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-10-23 21:47:56,352 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 10 states. [2020-10-23 21:47:56,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:56,807 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-10-23 21:47:56,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 21:47:56,808 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-10-23 21:47:56,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:56,810 INFO L225 Difference]: With dead ends: 44 [2020-10-23 21:47:56,810 INFO L226 Difference]: Without dead ends: 38 [2020-10-23 21:47:56,811 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2020-10-23 21:47:56,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-23 21:47:56,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-10-23 21:47:56,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-23 21:47:56,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-10-23 21:47:56,838 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 30 [2020-10-23 21:47:56,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:56,839 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-10-23 21:47:56,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 21:47:56,840 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-10-23 21:47:56,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-23 21:47:56,843 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:56,843 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 21:47:56,843 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 21:47:56,844 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:56,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:56,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1450661367, now seen corresponding path program 3 times [2020-10-23 21:47:56,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:56,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604598053] [2020-10-23 21:47:56,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:56,994 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:57,139 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:57,278 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:57,466 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:57,625 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:57,629 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:57,630 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:57,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:57,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:57,864 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 21:47:57,865 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604598053] [2020-10-23 21:47:57,865 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:57,866 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-10-23 21:47:57,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627858818] [2020-10-23 21:47:57,866 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 21:47:57,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:57,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 21:47:57,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-10-23 21:47:57,869 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 12 states. [2020-10-23 21:47:58,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:58,581 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-10-23 21:47:58,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-23 21:47:58,590 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2020-10-23 21:47:58,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:58,591 INFO L225 Difference]: With dead ends: 49 [2020-10-23 21:47:58,591 INFO L226 Difference]: Without dead ends: 43 [2020-10-23 21:47:58,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-10-23 21:47:58,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-23 21:47:58,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-10-23 21:47:58,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-23 21:47:58,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-10-23 21:47:58,615 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 35 [2020-10-23 21:47:58,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:58,615 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-10-23 21:47:58,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 21:47:58,616 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-10-23 21:47:58,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-23 21:47:58,617 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:58,617 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 21:47:58,618 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 21:47:58,618 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:58,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:58,620 INFO L82 PathProgramCache]: Analyzing trace with hash 772144646, now seen corresponding path program 4 times [2020-10-23 21:47:58,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:58,621 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617275109] [2020-10-23 21:47:58,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:58,872 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:59,005 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:47:59,158 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:59,305 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:47:59,308 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:47:59,310 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:59,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:59,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:59,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:59,622 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 21:47:59,622 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617275109] [2020-10-23 21:47:59,623 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:59,623 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2020-10-23 21:47:59,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905918015] [2020-10-23 21:47:59,624 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-23 21:47:59,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:59,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-23 21:47:59,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2020-10-23 21:47:59,625 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 14 states. [2020-10-23 21:48:00,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:48:00,532 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-10-23 21:48:00,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-23 21:48:00,534 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 40 [2020-10-23 21:48:00,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:48:00,535 INFO L225 Difference]: With dead ends: 54 [2020-10-23 21:48:00,535 INFO L226 Difference]: Without dead ends: 48 [2020-10-23 21:48:00,536 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2020-10-23 21:48:00,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-23 21:48:00,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-10-23 21:48:00,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-23 21:48:00,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-10-23 21:48:00,550 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 40 [2020-10-23 21:48:00,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:48:00,551 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-10-23 21:48:00,551 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-23 21:48:00,551 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-10-23 21:48:00,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-23 21:48:00,553 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:48:00,553 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 21:48:00,553 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 21:48:00,553 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:48:00,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:48:00,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1100914729, now seen corresponding path program 5 times [2020-10-23 21:48:00,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:48:00,555 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131151688] [2020-10-23 21:48:00,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:48:00,678 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:48:00,808 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:48:00,947 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:48:01,103 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:48:01,250 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:48:01,253 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:48:01,255 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:48:01,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:01,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:48:01,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:01,645 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 21:48:01,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131151688] [2020-10-23 21:48:01,645 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:48:01,646 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2020-10-23 21:48:01,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578315934] [2020-10-23 21:48:01,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-23 21:48:01,647 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:48:01,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-23 21:48:01,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2020-10-23 21:48:01,648 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 16 states. [2020-10-23 21:48:02,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:48:02,809 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-10-23 21:48:02,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-23 21:48:02,812 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-10-23 21:48:02,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:48:02,813 INFO L225 Difference]: With dead ends: 59 [2020-10-23 21:48:02,813 INFO L226 Difference]: Without dead ends: 53 [2020-10-23 21:48:02,814 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2020-10-23 21:48:02,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-23 21:48:02,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2020-10-23 21:48:02,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-23 21:48:02,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-10-23 21:48:02,830 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 45 [2020-10-23 21:48:02,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:48:02,831 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-10-23 21:48:02,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-23 21:48:02,831 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-10-23 21:48:02,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-23 21:48:02,832 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:48:02,833 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 21:48:02,833 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 21:48:02,833 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:48:02,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:48:02,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1507122150, now seen corresponding path program 6 times [2020-10-23 21:48:02,834 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:48:02,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669656639] [2020-10-23 21:48:02,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:48:03,077 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:48:03,206 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2020-10-23 21:48:03,361 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:48:03,507 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2020-10-23 21:48:03,509 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:48:03,510 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:48:03,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 21:48:03,538 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 21:48:03,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 21:48:03,561 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 21:48:03,615 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 21:48:03,616 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 21:48:03,617 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-23 21:48:03,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 09:48:03 BoogieIcfgContainer [2020-10-23 21:48:03,643 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 21:48:03,649 INFO L168 Benchmark]: Toolchain (without parser) took 10910.91 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 127.1 MB in the beginning and 119.6 MB in the end (delta: 7.5 MB). Peak memory consumption was 86.8 MB. Max. memory is 8.0 GB. [2020-10-23 21:48:03,650 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 126.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 21:48:03,651 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.81 ms. Allocated memory is still 151.0 MB. Free memory was 126.7 MB in the beginning and 117.6 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 21:48:03,651 INFO L168 Benchmark]: Boogie Preprocessor took 38.12 ms. Allocated memory is still 151.0 MB. Free memory was 117.6 MB in the beginning and 116.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 21:48:03,652 INFO L168 Benchmark]: RCFGBuilder took 518.03 ms. Allocated memory is still 151.0 MB. Free memory was 116.2 MB in the beginning and 102.6 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-10-23 21:48:03,653 INFO L168 Benchmark]: TraceAbstraction took 10049.18 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 102.2 MB in the beginning and 119.6 MB in the end (delta: -17.4 MB). Peak memory consumption was 61.6 MB. Max. memory is 8.0 GB. [2020-10-23 21:48:03,659 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 126.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 288.81 ms. Allocated memory is still 151.0 MB. Free memory was 126.7 MB in the beginning and 117.6 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 38.12 ms. Allocated memory is still 151.0 MB. Free memory was 117.6 MB in the beginning and 116.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 518.03 ms. Allocated memory is still 151.0 MB. Free memory was 116.2 MB in the beginning and 102.6 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 10049.18 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 102.2 MB in the beginning and 119.6 MB in the end (delta: -17.4 MB). Peak memory consumption was 61.6 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(x != 6) [L6] COND TRUE !(cond) [L7] CALL reach_error() [L3] __assert_fail("0", "underapprox_2-1.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: 9.9s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 3.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 198 SDslu, 649 SDs, 0 SdLazy, 980 SolverSat, 64 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 130 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 3.2s 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...