/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/nla-digbench-scaling/sqrt1-ll_valuebound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:34:26,054 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:34:26,056 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:34:26,086 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:34:26,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:34:26,107 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:34:26,109 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:34:26,110 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:34:26,112 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:34:26,113 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:34:26,115 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:34:26,122 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:34:26,123 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:34:26,124 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:34:26,125 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:34:26,127 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:34:26,134 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:34:26,142 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:34:26,144 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:34:26,145 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:34:26,146 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 12:34:26,163 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:34:26,163 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:34:26,166 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:34:26,166 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:34:26,166 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:34:26,167 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:34:26,167 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:34:26,167 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:34:26,167 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:34:26,167 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:34:26,168 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:34:26,168 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:34:26,168 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:34:26,168 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:34:26,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:34:26,169 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:34:26,169 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:34:26,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:34:26,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:34:26,169 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:34:26,169 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:34:26,169 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:34:26,170 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:34:26,170 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:34:26,469 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:34:26,486 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:34:26,489 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:34:26,490 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:34:26,490 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:34:26,491 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound1.c [2021-05-06 12:34:26,555 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e69df4e9/8190f30692f04ecf9043a4488db72bac/FLAG9ca9de7b5 [2021-05-06 12:34:27,037 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:34:27,037 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound1.c [2021-05-06 12:34:27,043 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e69df4e9/8190f30692f04ecf9043a4488db72bac/FLAG9ca9de7b5 [2021-05-06 12:34:27,526 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e69df4e9/8190f30692f04ecf9043a4488db72bac [2021-05-06 12:34:27,529 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:34:27,530 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:34:27,533 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:34:27,533 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:34:27,537 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:34:27,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,539 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26d27221 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27, skipping insertion in model container [2021-05-06 12:34:27,539 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,546 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:34:27,562 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:34:27,708 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound1.c[520,533] [2021-05-06 12:34:27,745 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:34:27,761 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:34:27,779 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound1.c[520,533] [2021-05-06 12:34:27,814 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:34:27,827 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:34:27,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27 WrapperNode [2021-05-06 12:34:27,827 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:34:27,829 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:34:27,830 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:34:27,830 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:34:27,840 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,840 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,846 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,847 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,857 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,861 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,864 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (1/1) ... [2021-05-06 12:34:27,869 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:34:27,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:34:27,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:34:27,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:34:27,872 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (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 12:34:27,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:34:27,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:34:27,940 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:34:27,940 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:34:27,940 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:34:27,941 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:34:27,941 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:34:27,941 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:34:27,941 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:34:27,941 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:34:27,941 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 12:34:27,942 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:34:27,942 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:34:27,942 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:34:27,942 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:34:27,942 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:34:27,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:34:27,943 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:34:27,943 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:34:27,944 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:34:28,233 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:34:28,233 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 12:34:28,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:34:28 BoogieIcfgContainer [2021-05-06 12:34:28,234 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:34:28,236 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:34:28,252 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:34:28,255 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:34:28,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:34:27" (1/3) ... [2021-05-06 12:34:28,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45e797d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:34:28, skipping insertion in model container [2021-05-06 12:34:28,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:27" (2/3) ... [2021-05-06 12:34:28,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45e797d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:34:28, skipping insertion in model container [2021-05-06 12:34:28,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:34:28" (3/3) ... [2021-05-06 12:34:28,258 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_valuebound1.c [2021-05-06 12:34:28,263 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:34:28,282 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:34:28,313 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:34:28,332 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:34:28,332 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:34:28,332 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:34:28,332 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:34:28,333 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:34:28,333 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:34:28,333 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:34:28,333 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:34:28,352 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 12:34:28,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 12:34:28,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:28,359 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:28,360 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:28,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:28,368 INFO L82 PathProgramCache]: Analyzing trace with hash 326851384, now seen corresponding path program 1 times [2021-05-06 12:34:28,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:28,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242685813] [2021-05-06 12:34:28,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:28,423 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:28,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:28,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:28,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:28,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:34:28,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:28,584 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 12:34:28,585 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:28,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242685813] [2021-05-06 12:34:28,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [242685813] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:28,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:28,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:34:28,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689791642] [2021-05-06 12:34:28,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:34:28,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:28,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:34:28,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:34:28,604 INFO L87 Difference]: Start difference. First operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:34:28,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:28,748 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-05-06 12:34:28,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:34:28,750 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 12:34:28,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:28,756 INFO L225 Difference]: With dead ends: 53 [2021-05-06 12:34:28,756 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 12:34:28,759 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:34:28,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 12:34:28,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 12:34:28,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 12:34:28,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-06 12:34:28,811 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 17 [2021-05-06 12:34:28,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:28,811 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-06 12:34:28,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:34:28,811 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-06 12:34:28,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 12:34:28,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:28,813 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:28,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:34:28,813 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:28,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:28,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1008578050, now seen corresponding path program 1 times [2021-05-06 12:34:28,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:28,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [349760927] [2021-05-06 12:34:28,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:28,817 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:28,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:28,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:28,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:28,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:34:28,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:28,956 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 12:34:28,957 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:28,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [349760927] [2021-05-06 12:34:28,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [349760927] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:28,957 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:28,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 12:34:28,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558666135] [2021-05-06 12:34:28,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 12:34:28,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:28,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 12:34:28,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:34:28,963 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:34:29,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:29,262 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-06 12:34:29,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 12:34:29,262 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 12:34:29,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:29,264 INFO L225 Difference]: With dead ends: 40 [2021-05-06 12:34:29,264 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 12:34:29,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 161.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 12:34:29,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 12:34:29,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-05-06 12:34:29,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 12:34:29,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-06 12:34:29,278 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 17 [2021-05-06 12:34:29,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:29,278 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-06 12:34:29,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:34:29,278 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-06 12:34:29,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 12:34:29,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:29,279 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:29,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:34:29,279 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:29,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:29,280 INFO L82 PathProgramCache]: Analyzing trace with hash -789682422, now seen corresponding path program 1 times [2021-05-06 12:34:29,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:29,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141249022] [2021-05-06 12:34:29,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:29,282 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:29,293 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2021-05-06 12:34:29,293 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 12:34:29,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 12:34:29,307 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-06 12:34:29,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 12:34:29 BoogieIcfgContainer [2021-05-06 12:34:29,308 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 12:34:29,309 INFO L168 Benchmark]: Toolchain (without parser) took 1778.51 ms. Allocated memory was 127.9 MB in the beginning and 190.8 MB in the end (delta: 62.9 MB). Free memory was 92.0 MB in the beginning and 107.3 MB in the end (delta: -15.3 MB). Peak memory consumption was 48.8 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:29,309 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 127.9 MB. Free memory is still 109.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 12:34:29,310 INFO L168 Benchmark]: CACSL2BoogieTranslator took 294.97 ms. Allocated memory was 127.9 MB in the beginning and 190.8 MB in the end (delta: 62.9 MB). Free memory was 91.8 MB in the beginning and 174.1 MB in the end (delta: -82.3 MB). Peak memory consumption was 12.4 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:29,310 INFO L168 Benchmark]: Boogie Preprocessor took 39.66 ms. Allocated memory is still 190.8 MB. Free memory was 174.1 MB in the beginning and 172.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:29,311 INFO L168 Benchmark]: RCFGBuilder took 364.33 ms. Allocated memory is still 190.8 MB. Free memory was 172.7 MB in the beginning and 158.4 MB in the end (delta: 14.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:29,311 INFO L168 Benchmark]: TraceAbstraction took 1071.83 ms. Allocated memory is still 190.8 MB. Free memory was 158.0 MB in the beginning and 107.3 MB in the end (delta: 50.7 MB). Peak memory consumption was 51.6 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:29,313 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 127.9 MB. Free memory is still 109.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 294.97 ms. Allocated memory was 127.9 MB in the beginning and 190.8 MB in the end (delta: 62.9 MB). Free memory was 91.8 MB in the beginning and 174.1 MB in the end (delta: -82.3 MB). Peak memory consumption was 12.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.66 ms. Allocated memory is still 190.8 MB. Free memory was 174.1 MB in the beginning and 172.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 364.33 ms. Allocated memory is still 190.8 MB. Free memory was 172.7 MB in the beginning and 158.4 MB in the end (delta: 14.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1071.83 ms. Allocated memory is still 190.8 MB. Free memory was 158.0 MB in the beginning and 107.3 MB in the end (delta: 50.7 MB). Peak memory consumption was 51.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 14]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L21] int n; [L22] long long a, s, t; [L23] n = __VERIFIER_nondet_int() [L24] CALL assume_abort_if_not(n>=0 && n<=1) [L9] COND FALSE !(!cond) [L24] RET assume_abort_if_not(n>=0 && n<=1) [L26] a = 0 [L27] s = 1 [L28] t = 1 [L30] COND TRUE 1 [L31] CALL __VERIFIER_assert(t == 2*a + 1) [L12] COND FALSE !(!(cond)) [L31] RET __VERIFIER_assert(t == 2*a + 1) [L32] CALL __VERIFIER_assert(s == (a + 1) * (a + 1)) [L12] COND TRUE !(cond) [L14] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 968.9ms, OverallIterations: 3, TraceHistogramMax: 2, EmptinessCheckTime: 13.4ms, AutomataDifference: 472.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 13.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 49 SDtfs, 40 SDslu, 32 SDs, 0 SdLazy, 99 SolverSat, 35 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 218.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 196.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred in iteration=2, InterpolantAutomatonStates: 10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 38.2ms AutomataMinimizationTime, 2 MinimizatonAttempts, 2 StatesRemovedByMinimization, 1 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request...