/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 22:55:55,730 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 22:55:55,734 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 22:55:55,781 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-23 22:55:55,829 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 22:55:55,832 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 22:55:55,834 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 22:55:55,838 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 22:55:55,842 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 22:55:55,844 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 22:55:55,856 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 22:55:55,862 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 22:55:55,869 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 22:55:55,870 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 22:55:55,872 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 22:55:55,873 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 22:55:55,880 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 22:55:55,895 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 22:55:55,910 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 22:55:55,911 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 22:55:55,913 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 22:55:55,914 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 22:55:55,914 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 22:55:55,914 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 22:55:55,915 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 22:55:55,915 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 22:55:55,915 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 22:55:55,916 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 22:55:55,916 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 22:55:55,916 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 22:55:55,917 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 22:55:55,917 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 22:55:55,917 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 22:55:55,917 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 22:55:55,918 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 22:55:55,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 22:55:55,918 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 22:55:55,919 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 22:55:55,919 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 22:55:55,919 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 22:55:55,919 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2021-02-23 22:55:56,373 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 22:55:56,413 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 22:55:56,417 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 22:55:56,418 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 22:55:56,422 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 22:55:56,424 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2021-02-23 22:55:56,523 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/276026e1c/d37f1d945b4a47d2bc3f061a405df792/FLAG142489f8c [2021-02-23 22:55:57,201 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 22:55:57,202 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2021-02-23 22:55:57,228 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/276026e1c/d37f1d945b4a47d2bc3f061a405df792/FLAG142489f8c [2021-02-23 22:55:57,603 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/276026e1c/d37f1d945b4a47d2bc3f061a405df792 [2021-02-23 22:55:57,608 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 22:55:57,630 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 22:55:57,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 22:55:57,638 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 22:55:57,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 22:55:57,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:57,647 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1732a27f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57, skipping insertion in model container [2021-02-23 22:55:57,647 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:57,657 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 22:55:57,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 22:55:57,934 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/id2_b3_o2.c[771,784] [2021-02-23 22:55:57,938 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 22:55:57,950 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 22:55:57,969 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/id2_b3_o2.c[771,784] [2021-02-23 22:55:57,970 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 22:55:57,987 INFO L208 MainTranslator]: Completed translation [2021-02-23 22:55:57,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57 WrapperNode [2021-02-23 22:55:57,988 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 22:55:57,990 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 22:55:57,990 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 22:55:57,990 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 22:55:58,004 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,005 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,014 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,015 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,025 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (1/1) ... [2021-02-23 22:55:58,027 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 22:55:58,029 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 22:55:58,029 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 22:55:58,029 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 22:55:58,030 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (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 22:55:58,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 22:55:58,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 22:55:58,224 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 22:55:58,224 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-02-23 22:55:58,225 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2021-02-23 22:55:58,225 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 22:55:58,225 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-02-23 22:55:58,225 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 22:55:58,226 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 22:55:58,226 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 22:55:58,227 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 22:55:58,227 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-02-23 22:55:58,228 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2021-02-23 22:55:58,228 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 22:55:58,228 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 22:55:58,229 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 22:55:58,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 22:55:58,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 22:55:58,230 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 22:55:58,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 22:55:58,647 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 22:55:58,648 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-23 22:55:58,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 10:55:58 BoogieIcfgContainer [2021-02-23 22:55:58,653 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 22:55:58,662 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 22:55:58,662 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 22:55:58,673 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 22:55:58,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 10:55:57" (1/3) ... [2021-02-23 22:55:58,675 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ed4e5e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 10:55:58, skipping insertion in model container [2021-02-23 22:55:58,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:55:57" (2/3) ... [2021-02-23 22:55:58,675 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ed4e5e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 10:55:58, skipping insertion in model container [2021-02-23 22:55:58,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 10:55:58" (3/3) ... [2021-02-23 22:55:58,686 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2021-02-23 22:55:58,701 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 22:55:58,708 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 22:55:58,732 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 22:55:58,764 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 22:55:58,764 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 22:55:58,764 INFO L378 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2021-02-23 22:55:58,764 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 22:55:58,765 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 22:55:58,765 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 22:55:58,765 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 22:55:58,765 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 22:55:58,785 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2021-02-23 22:55:58,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-23 22:55:58,796 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:55:58,797 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 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 22:55:58,798 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:55:58,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:55:58,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1880205997, now seen corresponding path program 1 times [2021-02-23 22:55:58,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:55:58,817 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986607992] [2021-02-23 22:55:58,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:55:58,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:55:59,061 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,063 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:55:59,065 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,066 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 22:55:59,084 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,085 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 22:55:59,101 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,102 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:55:59,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:55:59,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:55:59,194 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,195 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:55:59,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 22:55:59,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:55:59,215 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,216 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:55:59,227 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:55:59,229 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:55:59,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 22:55:59,263 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986607992] [2021-02-23 22:55:59,266 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:55:59,267 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 22:55:59,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745087623] [2021-02-23 22:55:59,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 22:55:59,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:55:59,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 22:55:59,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 22:55:59,299 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 6 states. [2021-02-23 22:56:00,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:56:00,086 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2021-02-23 22:56:00,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 22:56:00,088 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2021-02-23 22:56:00,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:56:00,099 INFO L225 Difference]: With dead ends: 60 [2021-02-23 22:56:00,099 INFO L226 Difference]: Without dead ends: 44 [2021-02-23 22:56:00,103 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-23 22:56:00,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-02-23 22:56:00,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-02-23 22:56:00,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-02-23 22:56:00,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-02-23 22:56:00,170 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 24 [2021-02-23 22:56:00,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:56:00,171 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-02-23 22:56:00,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 22:56:00,171 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-02-23 22:56:00,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-02-23 22:56:00,176 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:56:00,176 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:56:00,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 22:56:00,177 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:56:00,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:56:00,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1658084422, now seen corresponding path program 1 times [2021-02-23 22:56:00,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:56:00,178 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825191793] [2021-02-23 22:56:00,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:56:00,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:00,307 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,308 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:00,309 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,310 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:00,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:56:00,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:00,390 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,391 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:00,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 22:56:00,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:00,452 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,456 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:00,457 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,458 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:00,472 WARN L141 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size [2021-02-23 22:56:00,474 WARN L147 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size 23 [2021-02-23 22:56:00,501 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,502 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:00,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 22:56:00,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:00,516 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,517 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:00,518 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:00,519 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:00,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 22:56:00,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825191793] [2021-02-23 22:56:00,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:56:00,537 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 22:56:00,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850068977] [2021-02-23 22:56:00,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 22:56:00,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:56:00,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 22:56:00,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 22:56:00,541 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 6 states. [2021-02-23 22:56:00,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:56:00,902 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2021-02-23 22:56:00,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 22:56:00,903 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2021-02-23 22:56:00,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:56:00,905 INFO L225 Difference]: With dead ends: 71 [2021-02-23 22:56:00,905 INFO L226 Difference]: Without dead ends: 52 [2021-02-23 22:56:00,907 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-23 22:56:00,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-02-23 22:56:00,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 49. [2021-02-23 22:56:00,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2021-02-23 22:56:00,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-02-23 22:56:00,938 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 33 [2021-02-23 22:56:00,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:56:00,939 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-02-23 22:56:00,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 22:56:00,939 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-02-23 22:56:00,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-02-23 22:56:00,943 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:56:00,943 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:56:00,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 22:56:00,945 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:56:00,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:56:00,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1671222138, now seen corresponding path program 1 times [2021-02-23 22:56:00,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:56:00,948 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159275352] [2021-02-23 22:56:00,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:56:00,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:01,057 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,060 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:01,062 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,066 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:01,077 WARN L141 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size [2021-02-23 22:56:01,080 WARN L147 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size 23 [2021-02-23 22:56:01,109 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,113 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:01,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:56:01,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:01,181 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,182 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:01,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 22:56:01,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:01,234 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,234 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:01,236 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,239 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:01,258 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,259 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:01,277 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,279 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:01,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 22:56:01,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:01,323 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,325 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:01,327 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:01,328 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:01,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 22:56:01,347 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159275352] [2021-02-23 22:56:01,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:56:01,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-02-23 22:56:01,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819042841] [2021-02-23 22:56:01,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-23 22:56:01,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:56:01,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-23 22:56:01,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-02-23 22:56:01,356 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 9 states. [2021-02-23 22:56:01,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:56:01,957 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2021-02-23 22:56:01,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-23 22:56:01,958 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 33 [2021-02-23 22:56:01,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:56:01,960 INFO L225 Difference]: With dead ends: 57 [2021-02-23 22:56:01,960 INFO L226 Difference]: Without dead ends: 52 [2021-02-23 22:56:01,961 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-02-23 22:56:01,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-02-23 22:56:01,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-02-23 22:56:01,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-02-23 22:56:01,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-02-23 22:56:01,977 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 33 [2021-02-23 22:56:01,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:56:01,978 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-02-23 22:56:01,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-02-23 22:56:01,978 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-02-23 22:56:01,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-02-23 22:56:01,980 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:56:01,980 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:56:01,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-23 22:56:01,981 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:56:01,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:56:01,981 INFO L82 PathProgramCache]: Analyzing trace with hash -816709640, now seen corresponding path program 1 times [2021-02-23 22:56:01,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:56:01,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768419116] [2021-02-23 22:56:01,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:56:02,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,026 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,027 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,027 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,028 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:56:02,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,066 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,069 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 22:56:02,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,122 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,123 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,124 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,127 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 22:56:02,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,161 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,162 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,163 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,164 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,174 WARN L141 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size [2021-02-23 22:56:02,175 WARN L147 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size 23 [2021-02-23 22:56:02,198 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,198 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 22:56:02,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,208 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,209 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,210 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,212 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,231 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-23 22:56:02,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768419116] [2021-02-23 22:56:02,232 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:56:02,232 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 22:56:02,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344937018] [2021-02-23 22:56:02,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 22:56:02,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:56:02,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 22:56:02,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 22:56:02,235 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2021-02-23 22:56:02,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:56:02,559 INFO L93 Difference]: Finished difference Result 77 states and 84 transitions. [2021-02-23 22:56:02,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 22:56:02,559 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2021-02-23 22:56:02,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:56:02,561 INFO L225 Difference]: With dead ends: 77 [2021-02-23 22:56:02,561 INFO L226 Difference]: Without dead ends: 58 [2021-02-23 22:56:02,562 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-23 22:56:02,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-02-23 22:56:02,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2021-02-23 22:56:02,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2021-02-23 22:56:02,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-02-23 22:56:02,609 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 42 [2021-02-23 22:56:02,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:56:02,609 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-02-23 22:56:02,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 22:56:02,610 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-02-23 22:56:02,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-02-23 22:56:02,616 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:56:02,617 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:56:02,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-23 22:56:02,620 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:56:02,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:56:02,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1880334392, now seen corresponding path program 1 times [2021-02-23 22:56:02,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:56:02,623 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935327369] [2021-02-23 22:56:02,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:56:02,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,693 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,698 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,699 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,700 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:56:02,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,745 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,750 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 22:56:02,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,785 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,788 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,790 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,793 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,808 WARN L141 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size [2021-02-23 22:56:02,812 WARN L147 QuantifierPusher]: treesize reduction 1, result has 95.8 percent of original size 23 [2021-02-23 22:56:02,840 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,842 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 22:56:02,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,875 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,880 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,884 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,885 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,895 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,896 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,914 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,915 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 22:56:02,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:56:02,947 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,948 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:56:02,950 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:56:02,950 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:56:02,971 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-23 22:56:02,972 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935327369] [2021-02-23 22:56:02,972 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:56:02,972 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-02-23 22:56:02,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957917257] [2021-02-23 22:56:02,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-23 22:56:02,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:56:02,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-23 22:56:02,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-02-23 22:56:02,975 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand 9 states. [2021-02-23 22:56:03,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:56:03,658 INFO L93 Difference]: Finished difference Result 83 states and 91 transitions. [2021-02-23 22:56:03,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-23 22:56:03,658 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2021-02-23 22:56:03,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:56:03,660 INFO L225 Difference]: With dead ends: 83 [2021-02-23 22:56:03,660 INFO L226 Difference]: Without dead ends: 64 [2021-02-23 22:56:03,662 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-02-23 22:56:03,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-02-23 22:56:03,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2021-02-23 22:56:03,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2021-02-23 22:56:03,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2021-02-23 22:56:03,684 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 42 [2021-02-23 22:56:03,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:56:03,685 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2021-02-23 22:56:03,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-02-23 22:56:03,685 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2021-02-23 22:56:03,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-02-23 22:56:03,687 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:56:03,687 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:56:03,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-23 22:56:03,688 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:56:03,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:56:03,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1448972168, now seen corresponding path program 1 times [2021-02-23 22:56:03,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:56:03,689 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986609720] [2021-02-23 22:56:03,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:56:03,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 22:56:03,707 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 22:56:03,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 22:56:03,723 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 22:56:03,765 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 22:56:03,766 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 22:56:03,766 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-02-23 22:56:03,815 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 10:56:03 BoogieIcfgContainer [2021-02-23 22:56:03,815 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 22:56:03,817 INFO L168 Benchmark]: Toolchain (without parser) took 6203.13 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 136.4 MB in the beginning and 184.5 MB in the end (delta: -48.2 MB). Peak memory consumption was 20.8 MB. Max. memory is 8.0 GB. [2021-02-23 22:56:03,818 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 153.1 MB. Free memory is still 126.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 22:56:03,818 INFO L168 Benchmark]: CACSL2BoogieTranslator took 351.67 ms. Allocated memory is still 153.1 MB. Free memory was 135.3 MB in the beginning and 125.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2021-02-23 22:56:03,819 INFO L168 Benchmark]: Boogie Preprocessor took 37.95 ms. Allocated memory is still 153.1 MB. Free memory was 125.8 MB in the beginning and 124.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-23 22:56:03,820 INFO L168 Benchmark]: RCFGBuilder took 624.66 ms. Allocated memory is still 153.1 MB. Free memory was 124.5 MB in the beginning and 122.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. [2021-02-23 22:56:03,820 INFO L168 Benchmark]: TraceAbstraction took 5153.76 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 122.6 MB in the beginning and 184.5 MB in the end (delta: -62.0 MB). Peak memory consumption was 8.5 MB. Max. memory is 8.0 GB. [2021-02-23 22:56:03,823 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 153.1 MB. Free memory is still 126.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 351.67 ms. Allocated memory is still 153.1 MB. Free memory was 135.3 MB in the beginning and 125.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 37.95 ms. Allocated memory is still 153.1 MB. Free memory was 125.8 MB in the beginning and 124.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 624.66 ms. Allocated memory is still 153.1 MB. Free memory was 124.5 MB in the beginning and 122.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5153.76 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 122.6 MB in the beginning and 184.5 MB in the end (delta: -62.0 MB). Peak memory consumption was 8.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L24] unsigned int input = __VERIFIER_nondet_uint(); VAL [__VERIFIER_nondet_uint()=2, input=2] [L25] CALL, EXPR id(input) VAL [\old(x)=2] [L10] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L17] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L18] CALL, EXPR id(x-1) VAL [\old(x)=0] [L10] COND TRUE x==0 VAL [\old(x)=0, x=0] [L10] return 0; VAL [\old(x)=0, \result=0, x=0] [L18] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L18] unsigned int ret = id(x-1) + 1; VAL [\old(x)=1, id(x-1)=0, ret=1, x=1] [L19] COND FALSE !(ret > 3) VAL [\old(x)=1, ret=1, x=1] [L20] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L11] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L11] unsigned int ret = id2(x-1) + 1; VAL [\old(x)=2, id2(x-1)=1, ret=2, x=2] [L12] COND FALSE !(ret > 3) VAL [\old(x)=2, ret=2, x=2] [L13] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L25] RET, EXPR id(input) VAL [id(input)=2, input=2] [L25] unsigned int result = id(input); VAL [id(input)=2, input=2, result=2] [L26] COND TRUE result == 2 VAL [input=2, result=2] [L27] reach_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 50 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.0s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 2.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 210 SDtfs, 191 SDslu, 337 SDs, 0 SdLazy, 784 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 95 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 11 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 216 NumberOfCodeBlocks, 216 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 169 ConstructedInterpolants, 0 QuantifiedInterpolants, 19599 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 InterpolantCoveringCapability, 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...