/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_valuebound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:34:31,345 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:34:31,347 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:34:31,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:34:31,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:34:31,405 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:34:31,407 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:34:31,408 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:34:31,410 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:34:31,411 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:34:31,413 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:34:31,418 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:34:31,419 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:34:31,420 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:34:31,421 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:34:31,422 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:34:31,428 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:34:31,436 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:34:31,436 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:34:31,437 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:34:31,437 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 12:34:31,454 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:34:31,454 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:34:31,459 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:34:31,459 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:34:31,459 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:34:31,460 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:34:31,460 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:34:31,460 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:34:31,460 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:34:31,460 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:34:31,461 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:34:31,461 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:34:31,461 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:34:31,461 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:34:31,462 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:34:31,462 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:34:31,462 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:34:31,462 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:34:31,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:34:31,462 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:34:31,462 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:34:31,462 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:34:31,463 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:34:31,463 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:34:31,768 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:34:31,786 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:34:31,789 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:34:31,790 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:34:31,790 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:34:31,791 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound5.c [2021-05-06 12:34:31,859 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6091da256/da76f50b765a4ad6a39bae499e146413/FLAG18ae241a6 [2021-05-06 12:34:32,333 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:34:32,334 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound5.c [2021-05-06 12:34:32,340 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6091da256/da76f50b765a4ad6a39bae499e146413/FLAG18ae241a6 [2021-05-06 12:34:32,362 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6091da256/da76f50b765a4ad6a39bae499e146413 [2021-05-06 12:34:32,364 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:34:32,366 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:34:32,370 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:34:32,370 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:34:32,373 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:34:32,374 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,375 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38ef0404 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32, skipping insertion in model container [2021-05-06 12:34:32,375 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,381 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:34:32,394 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:34:32,524 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_valuebound5.c[520,533] [2021-05-06 12:34:32,535 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:34:32,542 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:34:32,552 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_valuebound5.c[520,533] [2021-05-06 12:34:32,563 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:34:32,574 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:34:32,574 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32 WrapperNode [2021-05-06 12:34:32,575 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:34:32,576 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:34:32,576 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:34:32,577 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:34:32,595 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,601 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,601 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,605 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,609 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,610 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (1/1) ... [2021-05-06 12:34:32,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:34:32,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:34:32,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:34:32,614 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:34:32,615 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (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 12:34:32,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:34:32,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:34:32,689 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:34:32,689 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:34:32,689 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:34:32,689 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:34:32,689 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:34:32,689 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:34:32,689 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:34:32,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:34:32,691 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:34:32,691 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:34:32,691 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:34:32,887 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:34:32,887 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 12:34:32,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:34:32 BoogieIcfgContainer [2021-05-06 12:34:32,889 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:34:32,890 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:34:32,890 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:34:32,892 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:34:32,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:34:32" (1/3) ... [2021-05-06 12:34:32,893 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a44e93d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:34:32, skipping insertion in model container [2021-05-06 12:34:32,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:32" (2/3) ... [2021-05-06 12:34:32,893 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a44e93d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:34:32, skipping insertion in model container [2021-05-06 12:34:32,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:34:32" (3/3) ... [2021-05-06 12:34:32,895 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_valuebound5.c [2021-05-06 12:34:32,899 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:34:32,902 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:34:32,915 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:34:32,947 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:34:32,947 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:34:32,947 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:34:32,947 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:34:32,948 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:34:32,948 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:34:32,948 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:34:32,948 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:34:32,976 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 12:34:32,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 12:34:32,982 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:32,982 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 12:34:32,982 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:32,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:32,987 INFO L82 PathProgramCache]: Analyzing trace with hash 326851384, now seen corresponding path program 1 times [2021-05-06 12:34:33,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:33,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [251382885] [2021-05-06 12:34:33,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:33,059 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:33,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:33,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:33,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:33,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:34:33,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:33,250 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 12:34:33,252 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:33,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [251382885] [2021-05-06 12:34:33,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [251382885] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:33,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:33,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:34:33,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761509179] [2021-05-06 12:34:33,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:34:33,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:33,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:34:33,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:34:33,275 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 12:34:33,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:33,410 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-05-06 12:34:33,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:34:33,412 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 12:34:33,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:33,418 INFO L225 Difference]: With dead ends: 53 [2021-05-06 12:34:33,418 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 12:34:33,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:34:33,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 12:34:33,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 12:34:33,475 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 12:34:33,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-06 12:34:33,477 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 17 [2021-05-06 12:34:33,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:33,478 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-06 12:34:33,478 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 12:34:33,478 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-06 12:34:33,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 12:34:33,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:33,509 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 12:34:33,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:34:33,509 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:33,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:33,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1008578050, now seen corresponding path program 1 times [2021-05-06 12:34:33,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:33,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333510820] [2021-05-06 12:34:33,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:33,513 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:33,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:33,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:33,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:33,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:34:33,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:33,664 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 12:34:33,665 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:33,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333510820] [2021-05-06 12:34:33,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1333510820] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:33,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:33,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 12:34:33,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249741058] [2021-05-06 12:34:33,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 12:34:33,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:33,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 12:34:33,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:34:33,667 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 12:34:33,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:33,897 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-06 12:34:33,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 12:34:33,897 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 12:34:33,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:33,898 INFO L225 Difference]: With dead ends: 40 [2021-05-06 12:34:33,899 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 12:34:33,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 118.7ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 12:34:33,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 12:34:33,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-05-06 12:34:33,911 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 12:34:33,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-06 12:34:33,913 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 17 [2021-05-06 12:34:33,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:33,913 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-06 12:34:33,913 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 12:34:33,913 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-06 12:34:33,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 12:34:33,914 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:33,914 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 12:34:33,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:34:33,915 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:33,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:33,915 INFO L82 PathProgramCache]: Analyzing trace with hash -789682422, now seen corresponding path program 1 times [2021-05-06 12:34:33,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:33,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412915040] [2021-05-06 12:34:33,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:33,918 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:33,928 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2021-05-06 12:34:33,928 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 12:34:33,931 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 12:34:33,941 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-06 12:34:33,941 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 12:34:33 BoogieIcfgContainer [2021-05-06 12:34:33,942 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 12:34:33,943 INFO L168 Benchmark]: Toolchain (without parser) took 1576.15 ms. Allocated memory is still 206.6 MB. Free memory was 170.6 MB in the beginning and 126.2 MB in the end (delta: 44.4 MB). Peak memory consumption was 44.2 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:33,943 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 206.6 MB. Free memory is still 187.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 12:34:33,943 INFO L168 Benchmark]: CACSL2BoogieTranslator took 206.23 ms. Allocated memory is still 206.6 MB. Free memory was 170.4 MB in the beginning and 186.5 MB in the end (delta: -16.1 MB). Peak memory consumption was 7.5 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:33,944 INFO L168 Benchmark]: Boogie Preprocessor took 35.17 ms. Allocated memory is still 206.6 MB. Free memory was 186.5 MB in the beginning and 190.3 MB in the end (delta: -3.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:33,944 INFO L168 Benchmark]: RCFGBuilder took 274.73 ms. Allocated memory is still 206.6 MB. Free memory was 190.3 MB in the beginning and 175.7 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:33,945 INFO L168 Benchmark]: TraceAbstraction took 1051.84 ms. Allocated memory is still 206.6 MB. Free memory was 175.3 MB in the beginning and 126.2 MB in the end (delta: 49.1 MB). Peak memory consumption was 49.3 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:33,947 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 206.6 MB. Free memory is still 187.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 206.23 ms. Allocated memory is still 206.6 MB. Free memory was 170.4 MB in the beginning and 186.5 MB in the end (delta: -16.1 MB). Peak memory consumption was 7.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.17 ms. Allocated memory is still 206.6 MB. Free memory was 186.5 MB in the beginning and 190.3 MB in the end (delta: -3.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 274.73 ms. Allocated memory is still 206.6 MB. Free memory was 190.3 MB in the beginning and 175.7 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1051.84 ms. Allocated memory is still 206.6 MB. Free memory was 175.3 MB in the beginning and 126.2 MB in the end (delta: 49.1 MB). Peak memory consumption was 49.3 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<=5) [L9] COND FALSE !(!cond) [L24] RET assume_abort_if_not(n>=0 && n<=5) [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: 987.0ms, OverallIterations: 3, TraceHistogramMax: 2, EmptinessCheckTime: 39.7ms, AutomataDifference: 395.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 24.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 49 SDtfs, 40 SDslu, 32 SDs, 0 SdLazy, 99 SolverSat, 35 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 168.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 170.9ms 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: 57.1ms 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...