/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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 0.1.25-3af5e1f [2020-09-04 17:46:36,902 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 17:46:36,906 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 17:46:36,934 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 17:46:36,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 17:46:36,936 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 17:46:36,937 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 17:46:36,940 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 17:46:36,941 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 17:46:36,943 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 17:46:36,944 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 17:46:36,945 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 17:46:36,946 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 17:46:36,947 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 17:46:36,948 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 17:46:36,950 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 17:46:36,951 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 17:46:36,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 17:46:36,954 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 17:46:36,957 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 17:46:36,958 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 17:46:36,960 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 17:46:36,961 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 17:46:36,963 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 17:46:36,966 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-04 17:46:36,966 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-04 17:46:36,966 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-04 17:46:36,968 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-04 17:46:36,968 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-04 17:46:36,969 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-04 17:46:36,970 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 17:46:36,971 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 17:46:36,972 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 17:46:36,973 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 17:46:36,976 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 17:46:36,976 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 17:46:36,977 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 17:46:36,977 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 17:46:36,977 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 17:46:36,979 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 17:46:36,980 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 17:46:36,981 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 17:46:36,993 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 17:46:36,993 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 17:46:36,995 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 17:46:36,995 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 17:46:36,995 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 17:46:36,996 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 17:46:36,996 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 17:46:36,996 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 17:46:36,996 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 17:46:36,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 17:46:36,997 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 17:46:36,997 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 17:46:36,997 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 17:46:36,997 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 17:46:36,997 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 17:46:36,998 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 17:46:36,998 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 17:46:36,998 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 17:46:36,998 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 17:46:36,998 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 17:46:36,999 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 17:46:36,999 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 17:46:36,999 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 17:46:37,465 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 17:46:37,495 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 17:46:37,500 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 17:46:37,502 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 17:46:37,503 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 17:46:37,504 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-09-04 17:46:37,619 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/74e1de6e4/868c8a62569d4c9ab63a4e79e4187c38/FLAG589ef5dd9 [2020-09-04 17:46:38,251 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 17:46:38,252 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-09-04 17:46:38,262 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/74e1de6e4/868c8a62569d4c9ab63a4e79e4187c38/FLAG589ef5dd9 [2020-09-04 17:46:38,591 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/74e1de6e4/868c8a62569d4c9ab63a4e79e4187c38 [2020-09-04 17:46:38,606 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 17:46:38,609 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 17:46:38,610 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 17:46:38,610 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 17:46:38,615 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 17:46:38,616 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:38,621 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b6d277a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38, skipping insertion in model container [2020-09-04 17:46:38,621 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:38,631 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 17:46:38,655 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 17:46:38,859 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:46:38,868 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 17:46:38,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:46:38,907 INFO L208 MainTranslator]: Completed translation [2020-09-04 17:46:38,908 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38 WrapperNode [2020-09-04 17:46:38,908 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 17:46:38,909 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 17:46:38,910 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 17:46:38,910 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 17:46:38,928 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:38,928 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:38,935 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:38,935 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:39,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:39,031 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:39,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... [2020-09-04 17:46:39,033 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 17:46:39,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 17:46:39,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 17:46:39,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 17:46:39,035 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 17:46:39,105 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 17:46:39,106 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 17:46:39,106 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 17:46:39,106 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 17:46:39,106 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 17:46:39,106 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 17:46:39,106 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 17:46:39,106 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 17:46:39,107 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 17:46:39,284 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 17:46:39,285 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 17:46:39,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:46:39 BoogieIcfgContainer [2020-09-04 17:46:39,290 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 17:46:39,291 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 17:46:39,292 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 17:46:39,296 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 17:46:39,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 05:46:38" (1/3) ... [2020-09-04 17:46:39,297 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cf2581 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:46:39, skipping insertion in model container [2020-09-04 17:46:39,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:38" (2/3) ... [2020-09-04 17:46:39,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cf2581 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:46:39, skipping insertion in model container [2020-09-04 17:46:39,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:46:39" (3/3) ... [2020-09-04 17:46:39,301 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-09-04 17:46:39,314 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 17:46:39,325 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 17:46:39,355 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 17:46:39,393 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 17:46:39,394 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 17:46:39,394 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 17:46:39,394 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 17:46:39,394 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 17:46:39,394 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 17:46:39,395 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 17:46:39,395 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 17:46:39,421 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-09-04 17:46:39,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 17:46:39,439 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:39,441 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:39,441 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:39,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:39,454 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-09-04 17:46:39,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:39,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107753228] [2020-09-04 17:46:39,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:39,574 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:39,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:39,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:39,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:39,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:39,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107753228] [2020-09-04 17:46:39,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:39,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 17:46:39,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856559165] [2020-09-04 17:46:39,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 17:46:39,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:39,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 17:46:39,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 17:46:39,683 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-09-04 17:46:39,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:39,718 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-09-04 17:46:39,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 17:46:39,720 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-09-04 17:46:39,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:39,732 INFO L225 Difference]: With dead ends: 33 [2020-09-04 17:46:39,732 INFO L226 Difference]: Without dead ends: 16 [2020-09-04 17:46:39,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 17:46:39,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-04 17:46:39,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-04 17:46:39,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-04 17:46:39,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-04 17:46:39,790 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-09-04 17:46:39,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:39,791 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-04 17:46:39,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 17:46:39,792 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-04 17:46:39,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 17:46:39,792 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:39,793 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:39,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 17:46:39,793 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:39,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:39,794 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-09-04 17:46:39,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:39,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934705663] [2020-09-04 17:46:39,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:39,797 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:39,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:39,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:39,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:39,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:39,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934705663] [2020-09-04 17:46:39,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:39,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 17:46:39,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799622361] [2020-09-04 17:46:39,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 17:46:39,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:39,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 17:46:39,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 17:46:39,932 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-09-04 17:46:39,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:39,964 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-04 17:46:39,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 17:46:39,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-09-04 17:46:39,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:39,966 INFO L225 Difference]: With dead ends: 24 [2020-09-04 17:46:39,966 INFO L226 Difference]: Without dead ends: 19 [2020-09-04 17:46:39,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 17:46:39,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-04 17:46:39,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-09-04 17:46:39,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-04 17:46:39,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-04 17:46:39,976 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-09-04 17:46:39,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:39,976 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-04 17:46:39,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 17:46:39,977 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-04 17:46:39,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 17:46:39,978 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:39,978 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:39,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 17:46:39,978 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:39,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:39,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-09-04 17:46:39,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:39,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313311695] [2020-09-04 17:46:39,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:40,008 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:40,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:40,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:40,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:40,163 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:40,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313311695] [2020-09-04 17:46:40,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:40,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 17:46:40,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426317322] [2020-09-04 17:46:40,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 17:46:40,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:40,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 17:46:40,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 17:46:40,167 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-09-04 17:46:40,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:40,218 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-09-04 17:46:40,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 17:46:40,219 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-09-04 17:46:40,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:40,220 INFO L225 Difference]: With dead ends: 31 [2020-09-04 17:46:40,220 INFO L226 Difference]: Without dead ends: 26 [2020-09-04 17:46:40,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-04 17:46:40,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-04 17:46:40,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2020-09-04 17:46:40,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-04 17:46:40,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-09-04 17:46:40,230 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-09-04 17:46:40,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:40,230 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-09-04 17:46:40,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 17:46:40,231 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-09-04 17:46:40,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-04 17:46:40,232 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:40,232 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:40,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 17:46:40,233 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:40,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:40,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-09-04 17:46:40,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:40,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933441220] [2020-09-04 17:46:40,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:40,246 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:40,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:40,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:40,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:40,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:40,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933441220] [2020-09-04 17:46:40,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:40,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 17:46:40,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849242733] [2020-09-04 17:46:40,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 17:46:40,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:40,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 17:46:40,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-04 17:46:40,412 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 7 states. [2020-09-04 17:46:40,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:40,460 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-09-04 17:46:40,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 17:46:40,460 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-09-04 17:46:40,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:40,462 INFO L225 Difference]: With dead ends: 36 [2020-09-04 17:46:40,462 INFO L226 Difference]: Without dead ends: 31 [2020-09-04 17:46:40,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 17:46:40,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-04 17:46:40,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2020-09-04 17:46:40,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-04 17:46:40,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-04 17:46:40,472 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-09-04 17:46:40,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:40,472 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-04 17:46:40,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 17:46:40,473 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-04 17:46:40,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 17:46:40,474 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:40,474 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:40,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 17:46:40,475 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:40,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:40,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-09-04 17:46:40,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:40,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52282290] [2020-09-04 17:46:40,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:40,482 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:40,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:40,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:40,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:40,700 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:40,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52282290] [2020-09-04 17:46:40,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:40,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-04 17:46:40,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155035829] [2020-09-04 17:46:40,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 17:46:40,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:40,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 17:46:40,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-04 17:46:40,706 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-09-04 17:46:40,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:40,938 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-09-04 17:46:40,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 17:46:40,939 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-04 17:46:40,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:40,940 INFO L225 Difference]: With dead ends: 39 [2020-09-04 17:46:40,940 INFO L226 Difference]: Without dead ends: 34 [2020-09-04 17:46:40,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-09-04 17:46:40,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-04 17:46:40,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-09-04 17:46:40,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 17:46:40,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-09-04 17:46:40,951 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-09-04 17:46:40,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:40,951 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-09-04 17:46:40,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 17:46:40,952 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-09-04 17:46:40,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 17:46:40,953 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:40,953 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:40,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 17:46:40,954 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:40,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:40,954 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-09-04 17:46:40,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:40,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258733431] [2020-09-04 17:46:40,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:40,960 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:40,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:41,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:41,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:41,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:41,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258733431] [2020-09-04 17:46:41,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:41,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-09-04 17:46:41,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14749932] [2020-09-04 17:46:41,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 17:46:41,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:41,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 17:46:41,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-09-04 17:46:41,185 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 11 states. [2020-09-04 17:46:41,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:41,449 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-04 17:46:41,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 17:46:41,449 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-09-04 17:46:41,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:41,451 INFO L225 Difference]: With dead ends: 44 [2020-09-04 17:46:41,451 INFO L226 Difference]: Without dead ends: 39 [2020-09-04 17:46:41,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-09-04 17:46:41,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-04 17:46:41,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-04 17:46:41,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 17:46:41,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-04 17:46:41,480 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-09-04 17:46:41,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:41,481 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-04 17:46:41,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 17:46:41,481 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-04 17:46:41,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 17:46:41,482 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:41,482 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:41,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 17:46:41,490 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:41,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:41,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-09-04 17:46:41,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:41,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581818168] [2020-09-04 17:46:41,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:41,502 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:41,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:41,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:41,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:41,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:46:41,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581818168] [2020-09-04 17:46:41,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:41,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-09-04 17:46:41,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130140462] [2020-09-04 17:46:41,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 17:46:41,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:41,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 17:46:41,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-04 17:46:41,777 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 13 states. [2020-09-04 17:46:42,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:42,113 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-09-04 17:46:42,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 17:46:42,114 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-09-04 17:46:42,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:42,115 INFO L225 Difference]: With dead ends: 49 [2020-09-04 17:46:42,115 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 17:46:42,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2020-09-04 17:46:42,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 17:46:42,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 17:46:42,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 17:46:42,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-09-04 17:46:42,125 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-09-04 17:46:42,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:42,126 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-09-04 17:46:42,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 17:46:42,126 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-09-04 17:46:42,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-04 17:46:42,127 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:42,128 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:42,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 17:46:42,128 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:42,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:42,129 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-09-04 17:46:42,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:42,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437611611] [2020-09-04 17:46:42,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:42,134 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:42,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 17:46:42,152 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 17:46:42,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 17:46:42,170 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 17:46:42,199 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 17:46:42,199 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 17:46:42,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 17:46:42,221 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 05:46:42 BoogieIcfgContainer [2020-09-04 17:46:42,221 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 17:46:42,225 INFO L168 Benchmark]: Toolchain (without parser) took 3615.35 ms. Allocated memory was 137.4 MB in the beginning and 249.6 MB in the end (delta: 112.2 MB). Free memory was 101.5 MB in the beginning and 199.9 MB in the end (delta: -98.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-09-04 17:46:42,226 INFO L168 Benchmark]: CDTParser took 1.14 ms. Allocated memory is still 137.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-04 17:46:42,227 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.00 ms. Allocated memory is still 137.4 MB. Free memory was 101.3 MB in the beginning and 92.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 17:46:42,228 INFO L168 Benchmark]: Boogie Preprocessor took 124.12 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 92.0 MB in the beginning and 179.9 MB in the end (delta: -87.9 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-09-04 17:46:42,229 INFO L168 Benchmark]: RCFGBuilder took 256.51 ms. Allocated memory is still 200.8 MB. Free memory was 179.9 MB in the beginning and 168.1 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2020-09-04 17:46:42,230 INFO L168 Benchmark]: TraceAbstraction took 2929.86 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 167.4 MB in the beginning and 199.9 MB in the end (delta: -32.5 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2020-09-04 17:46:42,234 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.14 ms. Allocated memory is still 137.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 299.00 ms. Allocated memory is still 137.4 MB. Free memory was 101.3 MB in the beginning and 92.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 124.12 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 92.0 MB in the beginning and 179.9 MB in the end (delta: -87.9 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 256.51 ms. Allocated memory is still 200.8 MB. Free memory was 179.9 MB in the beginning and 168.1 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2929.86 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 167.4 MB in the beginning and 199.9 MB in the end (delta: -32.5 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(y != 64) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.8s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 122 SDtfs, 62 SDslu, 454 SDs, 0 SdLazy, 392 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, 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, 7 MinimizatonAttempts, 16 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...