/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 17:40:01,597 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 17:40:01,600 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 17:40:01,636 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-23 17:40:01,649 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 17:40:01,650 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 17:40:01,651 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 17:40:01,653 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 17:40:01,654 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 17:40:01,667 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 17:40:01,673 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 17:40:01,678 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 17:40:01,680 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 17:40:01,686 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 17:40:01,688 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 17:40:01,689 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 17:40:01,695 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 17:40:01,716 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 17:40:01,739 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 17:40:01,740 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 17:40:01,745 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 17:40:01,745 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 17:40:01,745 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 17:40:01,746 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 17:40:01,746 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 17:40:01,746 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 17:40:01,746 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 17:40:01,746 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 17:40:01,747 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 17:40:01,747 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 17:40:01,748 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 17:40:01,748 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 17:40:01,749 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 17:40:01,749 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 17:40:01,749 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 17:40:01,749 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 17:40:01,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 17:40:01,751 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 17:40:01,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 17:40:01,757 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 17:40:01,757 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 17:40:02,178 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 17:40:02,210 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 17:40:02,214 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 17:40:02,215 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 17:40:02,216 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 17:40:02,217 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c [2021-02-23 17:40:02,307 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f76204b8/048b9b1b83724e05b6a1cdfa73da9b02/FLAG1dcb60a0d [2021-02-23 17:40:03,036 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 17:40:03,037 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec-1.c [2021-02-23 17:40:03,044 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f76204b8/048b9b1b83724e05b6a1cdfa73da9b02/FLAG1dcb60a0d [2021-02-23 17:40:03,434 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f76204b8/048b9b1b83724e05b6a1cdfa73da9b02 [2021-02-23 17:40:03,443 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 17:40:03,459 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 17:40:03,464 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 17:40:03,464 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 17:40:03,468 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 17:40:03,469 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,471 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4aa60480 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03, skipping insertion in model container [2021-02-23 17:40:03,471 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,480 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 17:40:03,497 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 17:40:03,660 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec-1.c[318,331] [2021-02-23 17:40:03,664 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 17:40:03,675 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 17:40:03,691 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec-1.c[318,331] [2021-02-23 17:40:03,692 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 17:40:03,708 INFO L208 MainTranslator]: Completed translation [2021-02-23 17:40:03,708 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03 WrapperNode [2021-02-23 17:40:03,709 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 17:40:03,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 17:40:03,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 17:40:03,710 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 17:40:03,724 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,733 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,738 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,740 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,741 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (1/1) ... [2021-02-23 17:40:03,743 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 17:40:03,744 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 17:40:03,744 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 17:40:03,745 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 17:40:03,746 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (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 [2021-02-23 17:40:03,856 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 17:40:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 17:40:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 17:40:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-02-23 17:40:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 17:40:03,857 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 17:40:03,858 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 17:40:03,858 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 17:40:03,859 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 17:40:03,859 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-02-23 17:40:03,860 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 17:40:03,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 17:40:03,860 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 17:40:03,861 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 17:40:03,862 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 17:40:03,862 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 17:40:03,863 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 17:40:04,283 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 17:40:04,284 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-23 17:40:04,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 05:40:04 BoogieIcfgContainer [2021-02-23 17:40:04,286 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 17:40:04,288 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 17:40:04,289 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 17:40:04,292 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 17:40:04,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 05:40:03" (1/3) ... [2021-02-23 17:40:04,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47923415 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 05:40:04, skipping insertion in model container [2021-02-23 17:40:04,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:40:03" (2/3) ... [2021-02-23 17:40:04,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47923415 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 05:40:04, skipping insertion in model container [2021-02-23 17:40:04,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 05:40:04" (3/3) ... [2021-02-23 17:40:04,297 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2021-02-23 17:40:04,325 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 17:40:04,330 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 17:40:04,353 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 17:40:04,377 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 17:40:04,378 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 17:40:04,378 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-23 17:40:04,378 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 17:40:04,378 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 17:40:04,378 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 17:40:04,379 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 17:40:04,379 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 17:40:04,395 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2021-02-23 17:40:04,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-23 17:40:04,405 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:40:04,409 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 17:40:04,409 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:40:04,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:40:04,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1187410242, now seen corresponding path program 1 times [2021-02-23 17:40:04,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:40:04,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919192360] [2021-02-23 17:40:04,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:40:04,517 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:40:04,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:40:04,751 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,753 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:40:04,755 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,757 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:40:04,778 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,779 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:40:04,798 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,800 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:40:04,820 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,822 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:40:04,845 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,847 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:40:04,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:40:04,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:40:04,974 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:04,976 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:40:04,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-02-23 17:40:04,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:40:05,000 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:05,001 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:40:05,035 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:40:05,036 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:40:05,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 17:40:05,079 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919192360] [2021-02-23 17:40:05,081 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:40:05,081 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-02-23 17:40:05,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790191418] [2021-02-23 17:40:05,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-23 17:40:05,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:40:05,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-23 17:40:05,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-02-23 17:40:05,107 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 9 states. [2021-02-23 17:40:05,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:40:05,766 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-02-23 17:40:05,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-23 17:40:05,773 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2021-02-23 17:40:05,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:40:05,785 INFO L225 Difference]: With dead ends: 38 [2021-02-23 17:40:05,785 INFO L226 Difference]: Without dead ends: 29 [2021-02-23 17:40:05,795 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-02-23 17:40:05,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-02-23 17:40:05,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-02-23 17:40:05,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-02-23 17:40:05,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2021-02-23 17:40:05,893 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 24 [2021-02-23 17:40:05,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:40:05,893 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2021-02-23 17:40:05,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-02-23 17:40:05,894 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2021-02-23 17:40:05,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-02-23 17:40:05,897 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:40:05,897 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 17:40:05,898 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 17:40:05,898 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:40:05,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:40:05,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1529674669, now seen corresponding path program 2 times [2021-02-23 17:40:05,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:40:05,904 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597713185] [2021-02-23 17:40:05,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:40:05,910 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:40:05,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 17:40:05,934 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 17:40:05,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 17:40:05,958 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 17:40:05,988 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 17:40:05,988 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 17:40:05,989 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 17:40:06,005 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 05:40:06 BoogieIcfgContainer [2021-02-23 17:40:06,005 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 17:40:06,007 INFO L168 Benchmark]: Toolchain (without parser) took 2561.55 ms. Allocated memory is still 151.0 MB. Free memory was 127.7 MB in the beginning and 93.2 MB in the end (delta: 34.5 MB). Peak memory consumption was 34.8 MB. Max. memory is 8.0 GB. [2021-02-23 17:40:06,008 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory was 125.3 MB in the beginning and 125.2 MB in the end (delta: 118.7 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 17:40:06,009 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.19 ms. Allocated memory is still 151.0 MB. Free memory was 126.6 MB in the beginning and 117.7 MB in the end (delta: 8.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2021-02-23 17:40:06,010 INFO L168 Benchmark]: Boogie Preprocessor took 33.63 ms. Allocated memory is still 151.0 MB. Free memory was 117.7 MB in the beginning and 115.9 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-23 17:40:06,011 INFO L168 Benchmark]: RCFGBuilder took 541.96 ms. Allocated memory is still 151.0 MB. Free memory was 115.9 MB in the beginning and 103.7 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-02-23 17:40:06,011 INFO L168 Benchmark]: TraceAbstraction took 1716.66 ms. Allocated memory is still 151.0 MB. Free memory was 103.3 MB in the beginning and 93.2 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.7 MB. Max. memory is 8.0 GB. [2021-02-23 17:40:06,015 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory was 125.3 MB in the beginning and 125.2 MB in the end (delta: 118.7 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 245.19 ms. Allocated memory is still 151.0 MB. Free memory was 126.6 MB in the beginning and 117.7 MB in the end (delta: 8.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.63 ms. Allocated memory is still 151.0 MB. Free memory was 117.7 MB in the beginning and 115.9 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 541.96 ms. Allocated memory is still 151.0 MB. Free memory was 115.9 MB in the beginning and 103.7 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1716.66 ms. Allocated memory is still 151.0 MB. Free memory was 103.3 MB in the beginning and 93.2 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] CALL f(4) [L6] COND FALSE !(n<3) [L7] n-- [L8] CALL f(n) [L6] COND FALSE !(n<3) [L7] n-- [L8] CALL f(n) [L6] COND TRUE n<3 [L8] RET f(n) [L9] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.6s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 17 SDtfs, 25 SDslu, 78 SDs, 0 SdLazy, 66 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=1, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...