/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/for_bounded_loop1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:08:59,035 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:08:59,037 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:08:59,062 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:08:59,104 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:08:59,105 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:08:59,105 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:08:59,126 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:08:59,145 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:08:59,145 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:08:59,146 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:08:59,146 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:08:59,146 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:08:59,146 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:08:59,147 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:08:59,148 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:08:59,149 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:08:59,149 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:08:59,149 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:08:59,149 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:08:59,444 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:08:59,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:08:59,464 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:08:59,465 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:08:59,466 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:08:59,467 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/for_bounded_loop1.c [2021-05-06 11:08:59,515 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0aa49af3b/330b90a607f44d4d8475e254b8f1a437/FLAG7311f4e5b [2021-05-06 11:08:59,877 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:08:59,878 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/for_bounded_loop1.c [2021-05-06 11:08:59,882 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0aa49af3b/330b90a607f44d4d8475e254b8f1a437/FLAG7311f4e5b [2021-05-06 11:09:00,313 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0aa49af3b/330b90a607f44d4d8475e254b8f1a437 [2021-05-06 11:09:00,315 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:09:00,317 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:09:00,321 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:00,322 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:09:00,324 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:09:00,324 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,325 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fbca7d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00, skipping insertion in model container [2021-05-06 11:09:00,325 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,330 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:09:00,344 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:09:00,433 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/for_bounded_loop1.c[416,429] [2021-05-06 11:09:00,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:00,445 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:09:00,452 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/for_bounded_loop1.c[416,429] [2021-05-06 11:09:00,455 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:00,463 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:09:00,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00 WrapperNode [2021-05-06 11:09:00,464 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:00,465 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:09:00,465 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:09:00,465 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:09:00,471 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,475 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,475 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,478 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,490 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,492 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,501 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:09:00,501 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:09:00,501 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:09:00,502 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:09:00,502 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (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 [2021-05-06 11:09:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:09:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:09:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:09:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 11:09:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:09:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:09:00,581 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:09:00,581 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:09:00,581 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:09:00,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:09:00,581 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 11:09:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:09:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 11:09:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:09:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:09:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:09:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:09:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:09:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:09:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:09:00,798 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:09:00,798 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:09:00,799 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:00 BoogieIcfgContainer [2021-05-06 11:09:00,799 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:09:00,800 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:09:00,800 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:09:00,802 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:09:00,802 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:09:00" (1/3) ... [2021-05-06 11:09:00,803 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@612ae34d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:00, skipping insertion in model container [2021-05-06 11:09:00,803 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (2/3) ... [2021-05-06 11:09:00,803 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@612ae34d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:00, skipping insertion in model container [2021-05-06 11:09:00,803 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:00" (3/3) ... [2021-05-06 11:09:00,804 INFO L111 eAbstractionObserver]: Analyzing ICFG for_bounded_loop1.c [2021-05-06 11:09:00,807 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:09:00,810 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:09:00,819 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:09:00,841 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:09:00,841 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:09:00,841 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:09:00,841 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:09:00,841 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:09:00,841 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:09:00,841 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:09:00,841 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:09:00,853 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:00,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:09:00,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:00,861 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:00,861 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:00,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:00,870 INFO L82 PathProgramCache]: Analyzing trace with hash 669529748, now seen corresponding path program 1 times [2021-05-06 11:09:00,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:00,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [702361626] [2021-05-06 11:09:00,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,131 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:01,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:01,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:01,285 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:01,285 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [702361626] [2021-05-06 11:09:01,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [702361626] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:01,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:01,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:09:01,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944668726] [2021-05-06 11:09:01,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:09:01,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:01,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:09:01,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:01,303 INFO L87 Difference]: Start difference. First operand has 24 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:01,388 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2021-05-06 11:09:01,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:09:01,390 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:09:01,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:01,395 INFO L225 Difference]: With dead ends: 41 [2021-05-06 11:09:01,395 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:09:01,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:01,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:09:01,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 11:09:01,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:01,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-06 11:09:01,438 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-05-06 11:09:01,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:01,438 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-06 11:09:01,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,439 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-06 11:09:01,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:09:01,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:01,440 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:01,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:09:01,440 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:01,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:01,441 INFO L82 PathProgramCache]: Analyzing trace with hash 657523975, now seen corresponding path program 1 times [2021-05-06 11:09:01,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:01,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639921482] [2021-05-06 11:09:01,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,449 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:01,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:01,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:01,546 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:01,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639921482] [2021-05-06 11:09:01,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1639921482] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:01,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:01,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:09:01,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742453969] [2021-05-06 11:09:01,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:09:01,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:01,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:09:01,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:09:01,551 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:01,651 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-06 11:09:01,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:09:01,652 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:09:01,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:01,653 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:09:01,653 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 11:09:01,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 65.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:01,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 11:09:01,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2021-05-06 11:09:01,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:01,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-06 11:09:01,660 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2021-05-06 11:09:01,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:01,660 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-06 11:09:01,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,660 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-06 11:09:01,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:09:01,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:01,661 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:01,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:09:01,661 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:01,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:01,661 INFO L82 PathProgramCache]: Analyzing trace with hash 659251853, now seen corresponding path program 1 times [2021-05-06 11:09:01,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:01,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344304178] [2021-05-06 11:09:01,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,663 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:01,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:01,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:01,783 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:01,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344304178] [2021-05-06 11:09:01,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [344304178] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:01,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:01,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:01,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285405097] [2021-05-06 11:09:01,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:01,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:01,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:01,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:01,785 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,048 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-06 11:09:02,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:02,048 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:09:02,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,051 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:09:02,051 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 11:09:02,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 219.7ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:02,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 11:09:02,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-05-06 11:09:02,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.125) internal successors, (18), 18 states have internal predecessors, (18), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:09:02,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-05-06 11:09:02,065 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 12 [2021-05-06 11:09:02,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,066 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-05-06 11:09:02,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,066 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-05-06 11:09:02,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:09:02,067 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,067 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:02,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:09:02,068 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,068 INFO L82 PathProgramCache]: Analyzing trace with hash -932371294, now seen corresponding path program 1 times [2021-05-06 11:09:02,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087938946] [2021-05-06 11:09:02,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,072 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-05-06 11:09:02,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,184 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087938946] [2021-05-06 11:09:02,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1087938946] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:02,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168444959] [2021-05-06 11:09:02,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:02,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:02,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:02,186 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:02,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,418 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-05-06 11:09:02,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:02,418 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-05-06 11:09:02,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,419 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:09:02,419 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 11:09:02,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 184.1ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:02,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 11:09:02,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2021-05-06 11:09:02,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 23 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:02,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-06 11:09:02,425 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 19 [2021-05-06 11:09:02,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,425 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-06 11:09:02,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:02,425 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-06 11:09:02,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:09:02,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,426 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:02,426 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:09:02,426 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1861509246, now seen corresponding path program 1 times [2021-05-06 11:09:02,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360392523] [2021-05-06 11:09:02,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,495 WARN L240 tifierPushTermWalker]: treesize reduction 26, result has 80.0 percent of original size [2021-05-06 11:09:02,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:02,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:02,584 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:09:02,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:09:02,632 WARN L245 tifierPushTermWalker]: treesize reduction 26, result has 80.0 percent of original size 104 [2021-05-06 11:09:02,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:02,675 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:02,987 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360392523] [2021-05-06 11:09:02,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [360392523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,987 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,987 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:02,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002424349] [2021-05-06 11:09:02,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:02,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:02,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:02,989 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:03,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:03,368 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-05-06 11:09:03,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:03,369 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-06 11:09:03,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:03,370 INFO L225 Difference]: With dead ends: 41 [2021-05-06 11:09:03,370 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 11:09:03,371 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 8 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 468.5ms TimeCoverageRelationStatistics Valid=121, Invalid=529, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:03,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 11:09:03,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 11:09:03,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 11:09:03,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 11:09:03,371 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 26 [2021-05-06 11:09:03,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:03,372 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 11:09:03,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:03,372 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 11:09:03,372 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 11:09:03,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:09:03,374 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 11:09:04,005 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2021-05-06 11:09:04,005 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 3) no Hoare annotation was computed. [2021-05-06 11:09:04,005 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2021-05-06 11:09:04,005 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-06 11:09:04,006 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 6 8) no Hoare annotation was computed. [2021-05-06 11:09:04,006 INFO L198 CegarLoopUtils]: For program point L7(line 7) no Hoare annotation was computed. [2021-05-06 11:09:04,006 INFO L198 CegarLoopUtils]: For program point L7-2(lines 6 8) no Hoare annotation was computed. [2021-05-06 11:09:04,006 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 6 8) no Hoare annotation was computed. [2021-05-06 11:09:04,006 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 18 32) the Hoare annotation is: true [2021-05-06 11:09:04,006 INFO L194 CegarLoopUtils]: At program point L29(line 29) the Hoare annotation is: (and (<= 0 (+ main_~y~0 2147483648)) (not (= main_~y~0 0)) (= main_~y~0 main_~x~0) (<= main_~y~0 2147483647)) [2021-05-06 11:09:04,006 INFO L194 CegarLoopUtils]: At program point L29-1(lines 22 30) the Hoare annotation is: (and (<= 0 (+ main_~y~0 2147483648)) (not (= main_~y~0 0)) (= main_~y~0 main_~x~0) (<= main_~y~0 2147483647)) [2021-05-06 11:09:04,006 INFO L194 CegarLoopUtils]: At program point L27(line 27) the Hoare annotation is: (and (<= 0 (+ main_~y~0 2147483648)) (= main_~x~0 0) (<= main_~y~0 2147483647)) [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L25(line 25) the Hoare annotation is: (and (<= 0 (+ main_~y~0 2147483648)) (= main_~x~0 0) (<= main_~y~0 2147483647)) [2021-05-06 11:09:04,007 INFO L201 CegarLoopUtils]: At program point mainEXIT(lines 18 32) the Hoare annotation is: true [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L25-1(line 25) the Hoare annotation is: (and (<= 0 (+ main_~y~0 2147483648)) (= main_~x~0 0) (<= main_~y~0 2147483647)) [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L21(line 21) the Hoare annotation is: (and (= main_~y~0 0) (= main_~x~0 0)) [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L22-2(lines 22 30) the Hoare annotation is: (let ((.cse0 (= main_~y~0 0))) (or (and (<= 0 (+ main_~y~0 2147483648)) (not .cse0) (= main_~y~0 main_~x~0) (<= main_~y~0 2147483647)) (and (= main_~i~0 0) .cse0 (= (+ main_~x~0 main_~y~0) 0) (< main_~i~0 main_~n~0)))) [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L22-3(lines 22 30) the Hoare annotation is: false [2021-05-06 11:09:04,007 INFO L201 CegarLoopUtils]: At program point mainFINAL(lines 18 32) the Hoare annotation is: true [2021-05-06 11:09:04,007 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 9 14) the Hoare annotation is: true [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L11(line 11) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point L10(lines 10 12) the Hoare annotation is: (let ((.cse0 (= |__VERIFIER_assert_#in~cond| 0)) (.cse1 (not (= main_~y~0 0))) (.cse2 (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond))) (and (or .cse0 (not (= __VERIFIER_assert_~cond 0))) (or (not (<= 0 (+ main_~y~0 2147483648))) (not (= (ite .cse1 1 0) |__VERIFIER_assert_#in~cond|)) .cse0 .cse2 (not (<= main_~y~0 2147483647))) (or .cse1 .cse2 (not (< main_~i~0 main_~n~0)) (not (= |__VERIFIER_assert_#in~cond| (ite (= (* main_~y~0 (- 1)) 0) 1 0)))))) [2021-05-06 11:09:04,007 INFO L194 CegarLoopUtils]: At program point __VERIFIER_assertEXIT(lines 9 14) the Hoare annotation is: (let ((.cse0 (= |__VERIFIER_assert_#in~cond| 0)) (.cse1 (not (= main_~y~0 0))) (.cse2 (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond))) (and (or .cse0 (not (= __VERIFIER_assert_~cond 0))) (or (not (<= 0 (+ main_~y~0 2147483648))) (not (= (ite .cse1 1 0) |__VERIFIER_assert_#in~cond|)) .cse0 .cse2 (not (<= main_~y~0 2147483647))) (or .cse1 .cse2 (not (< main_~i~0 main_~n~0)) (not (= |__VERIFIER_assert_#in~cond| (ite (= (* main_~y~0 (- 1)) 0) 1 0)))))) [2021-05-06 11:09:04,008 INFO L194 CegarLoopUtils]: At program point L10-2(lines 9 14) the Hoare annotation is: (let ((.cse0 (= |__VERIFIER_assert_#in~cond| 0)) (.cse1 (not (= main_~y~0 0))) (.cse2 (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond))) (and (or .cse0 (not (= __VERIFIER_assert_~cond 0))) (or (not (<= 0 (+ main_~y~0 2147483648))) (not (= (ite .cse1 1 0) |__VERIFIER_assert_#in~cond|)) .cse0 .cse2 (not (<= main_~y~0 2147483647))) (or .cse1 .cse2 (not (< main_~i~0 main_~n~0)) (not (= |__VERIFIER_assert_#in~cond| (ite (= (* main_~y~0 (- 1)) 0) 1 0)))))) [2021-05-06 11:09:04,008 INFO L194 CegarLoopUtils]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 11) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2021-05-06 11:09:04,018 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:09:04 BoogieIcfgContainer [2021-05-06 11:09:04,018 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:09:04,018 INFO L168 Benchmark]: Toolchain (without parser) took 3701.86 ms. Allocated memory was 175.1 MB in the beginning and 218.1 MB in the end (delta: 43.0 MB). Free memory was 141.2 MB in the beginning and 104.7 MB in the end (delta: 36.5 MB). Peak memory consumption was 109.8 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:04,019 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 175.1 MB. Free memory is still 157.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:09:04,019 INFO L168 Benchmark]: CACSL2BoogieTranslator took 142.70 ms. Allocated memory is still 175.1 MB. Free memory was 140.9 MB in the beginning and 131.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:04,019 INFO L168 Benchmark]: Boogie Preprocessor took 36.12 ms. Allocated memory is still 175.1 MB. Free memory was 131.4 MB in the beginning and 130.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:04,019 INFO L168 Benchmark]: RCFGBuilder took 297.51 ms. Allocated memory is still 175.1 MB. Free memory was 129.9 MB in the beginning and 145.0 MB in the end (delta: -15.1 MB). Peak memory consumption was 4.0 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:04,020 INFO L168 Benchmark]: TraceAbstraction took 3218.05 ms. Allocated memory was 175.1 MB in the beginning and 218.1 MB in the end (delta: 43.0 MB). Free memory was 145.0 MB in the beginning and 104.7 MB in the end (delta: 40.3 MB). Peak memory consumption was 113.2 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:04,020 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 175.1 MB. Free memory is still 157.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 142.70 ms. Allocated memory is still 175.1 MB. Free memory was 140.9 MB in the beginning and 131.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.12 ms. Allocated memory is still 175.1 MB. Free memory was 131.4 MB in the beginning and 130.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 297.51 ms. Allocated memory is still 175.1 MB. Free memory was 129.9 MB in the beginning and 145.0 MB in the end (delta: -15.1 MB). Peak memory consumption was 4.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3218.05 ms. Allocated memory was 175.1 MB in the beginning and 218.1 MB in the end (delta: 43.0 MB). Free memory was 145.0 MB in the beginning and 104.7 MB in the end (delta: 40.3 MB). Peak memory consumption was 113.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 11]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2533.3ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 13.2ms, AutomataDifference: 1095.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 631.9ms, InitialAbstractionConstructionTime: 8.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 84 SDtfs, 125 SDslu, 109 SDs, 0 SdLazy, 288 SolverSat, 70 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 281.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 78 GetRequests, 23 SyntacticMatches, 5 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 980.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=4, InterpolantAutomatonStates: 37, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 52.7ms AutomataMinimizationTime, 5 MinimizatonAttempts, 10 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 24 LocationsWithAnnotation, 72 PreInvPairs, 100 NumberOfFragments, 332 HoareAnnotationTreeSize, 72 FomulaSimplifications, 1309 FormulaSimplificationTreeSizeReduction, 130.8ms HoareSimplificationTime, 24 FomulaSimplificationsInter, 1563 FormulaSimplificationTreeSizeReductionInter, 489.3ms HoareSimplificationTimeInter, 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (((0 <= y + 2147483648 && !(y == 0)) && y == x) && y <= 2147483647) || (((i == 0 && y == 0) && x + y == 0) && i < n) - ProcedureContractResult [Line: 18]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 9]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: ((\old(cond) == 0 || !(cond == 0)) && ((((!(0 <= y + 2147483648) || !((if !(y == 0) then 1 else 0) == \old(cond))) || \old(cond) == 0) || \old(cond) == cond) || !(y <= 2147483647))) && (((!(y == 0) || \old(cond) == cond) || !(i < n)) || !(\old(cond) == (if y * -1 == 0 then 1 else 0))) RESULT: Ultimate proved your program to be correct! Received shutdown request...