/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/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-21 20:30:18,180 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-21 20:30:18,183 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-21 20:30:18,224 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-21 20:30:18,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-21 20:30:18,249 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-21 20:30:18,250 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-21 20:30:18,252 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-21 20:30:18,252 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-21 20:30:18,254 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-21 20:30:18,256 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-21 20:30:18,258 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-21 20:30:18,260 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-21 20:30:18,261 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-21 20:30:18,263 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-21 20:30:18,264 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-21 20:30:18,267 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-21 20:30:18,277 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-21 20:30:18,278 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-21 20:30:18,279 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-21 20:30:18,280 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-21 20:30:18,292 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-21 20:30:18,293 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-21 20:30:18,294 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-21 20:30:18,295 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-21 20:30:18,295 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-21 20:30:18,295 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-21 20:30:18,295 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-21 20:30:18,296 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-21 20:30:18,296 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-21 20:30:18,296 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-21 20:30:18,296 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-21 20:30:18,297 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-21 20:30:18,297 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-21 20:30:18,297 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-21 20:30:18,298 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-21 20:30:18,298 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-21 20:30:18,298 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-21 20:30:18,298 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-21 20:30:18,299 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-21 20:30:18,299 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-21 20:30:18,299 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-21 20:30:18,299 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-21 20:30:18,299 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-21 20:30:18,683 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-21 20:30:18,719 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-21 20:30:18,722 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-21 20:30:18,723 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-21 20:30:18,724 INFO L275 PluginConnector]: CDTParser initialized [2021-02-21 20:30:18,725 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2021-02-21 20:30:18,820 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c2f6579a/62da01c15ea04762b10d221e7d94d09e/FLAGa66ded5f7 [2021-02-21 20:30:19,370 INFO L306 CDTParser]: Found 1 translation units. [2021-02-21 20:30:19,370 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2021-02-21 20:30:19,376 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c2f6579a/62da01c15ea04762b10d221e7d94d09e/FLAGa66ded5f7 [2021-02-21 20:30:19,762 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c2f6579a/62da01c15ea04762b10d221e7d94d09e [2021-02-21 20:30:19,765 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-21 20:30:19,781 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-21 20:30:19,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-21 20:30:19,786 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-21 20:30:19,791 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-21 20:30:19,792 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 08:30:19" (1/1) ... [2021-02-21 20:30:19,794 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e6e093b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:19, skipping insertion in model container [2021-02-21 20:30:19,794 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 08:30:19" (1/1) ... [2021-02-21 20:30:19,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-21 20:30:19,821 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-21 20:30:19,972 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/sum_2x3-1.c[479,492] [2021-02-21 20:30:19,976 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 20:30:19,988 INFO L203 MainTranslator]: Completed pre-run [2021-02-21 20:30:20,005 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/sum_2x3-1.c[479,492] [2021-02-21 20:30:20,006 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 20:30:20,024 INFO L208 MainTranslator]: Completed translation [2021-02-21 20:30:20,025 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20 WrapperNode [2021-02-21 20:30:20,025 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-21 20:30:20,026 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-21 20:30:20,026 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-21 20:30:20,027 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-21 20:30:20,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,050 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,056 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,058 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,060 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (1/1) ... [2021-02-21 20:30:20,061 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-21 20:30:20,062 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-21 20:30:20,063 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-21 20:30:20,063 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-21 20:30:20,064 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (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 [2021-02-21 20:30:20,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-21 20:30:20,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-21 20:30:20,177 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-21 20:30:20,177 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2021-02-21 20:30:20,178 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-21 20:30:20,178 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-21 20:30:20,178 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-21 20:30:20,178 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-21 20:30:20,179 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-21 20:30:20,179 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2021-02-21 20:30:20,179 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-21 20:30:20,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-21 20:30:20,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-21 20:30:20,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-21 20:30:20,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-21 20:30:20,180 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-21 20:30:20,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-21 20:30:20,558 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-21 20:30:20,559 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-21 20:30:20,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 08:30:20 BoogieIcfgContainer [2021-02-21 20:30:20,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-21 20:30:20,564 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-21 20:30:20,564 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-21 20:30:20,569 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-21 20:30:20,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.02 08:30:19" (1/3) ... [2021-02-21 20:30:20,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@349fac8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 08:30:20, skipping insertion in model container [2021-02-21 20:30:20,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 08:30:20" (2/3) ... [2021-02-21 20:30:20,571 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@349fac8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 08:30:20, skipping insertion in model container [2021-02-21 20:30:20,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 08:30:20" (3/3) ... [2021-02-21 20:30:20,573 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2021-02-21 20:30:20,582 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-21 20:30:20,588 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-21 20:30:20,646 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-21 20:30:20,705 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-21 20:30:20,705 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-21 20:30:20,705 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-21 20:30:20,705 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-21 20:30:20,706 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-21 20:30:20,706 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-21 20:30:20,706 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-21 20:30:20,706 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-21 20:30:20,728 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2021-02-21 20:30:20,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-21 20:30:20,740 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 20:30:20,741 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] [2021-02-21 20:30:20,741 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 20:30:20,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 20:30:20,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1485133070, now seen corresponding path program 1 times [2021-02-21 20:30:20,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-21 20:30:20,760 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730839861] [2021-02-21 20:30:20,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 20:30:20,842 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-21 20:30:20,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:20,986 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:20,987 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 20:30:20,989 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:20,990 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:21,008 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,009 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 20:30:21,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 20:30:21,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:21,094 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,095 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 20:30:21,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-21 20:30:21,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:21,117 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,118 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:21,141 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,143 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-21 20:30:21,172 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,173 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:21,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-21 20:30:21,201 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730839861] [2021-02-21 20:30:21,203 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 20:30:21,204 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-02-21 20:30:21,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864319115] [2021-02-21 20:30:21,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-21 20:30:21,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-21 20:30:21,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-21 20:30:21,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-02-21 20:30:21,227 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 7 states. [2021-02-21 20:30:21,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 20:30:21,726 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2021-02-21 20:30:21,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-21 20:30:21,728 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2021-02-21 20:30:21,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 20:30:21,747 INFO L225 Difference]: With dead ends: 48 [2021-02-21 20:30:21,747 INFO L226 Difference]: Without dead ends: 33 [2021-02-21 20:30:21,756 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-21 20:30:21,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-02-21 20:30:21,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-02-21 20:30:21,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-02-21 20:30:21,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-02-21 20:30:21,826 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 26 [2021-02-21 20:30:21,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 20:30:21,827 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-02-21 20:30:21,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-02-21 20:30:21,827 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-02-21 20:30:21,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-02-21 20:30:21,830 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 20:30:21,830 INFO L422 BasicCegarLoop]: trace histogram [2, 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] [2021-02-21 20:30:21,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-21 20:30:21,831 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 20:30:21,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 20:30:21,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1822905144, now seen corresponding path program 1 times [2021-02-21 20:30:21,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-21 20:30:21,833 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035461118] [2021-02-21 20:30:21,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 20:30:21,839 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-21 20:30:21,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:21,947 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,948 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 20:30:21,949 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,951 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:21,956 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:21,957 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 20:30:21,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 20:30:22,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:22,028 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:22,028 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 20:30:22,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-21 20:30:22,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:22,049 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:22,050 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:22,056 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:22,057 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:22,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-02-21 20:30:22,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 20:30:22,079 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:22,079 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:22,081 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:22,082 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-21 20:30:22,093 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 20:30:22,093 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 20:30:22,107 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-02-21 20:30:22,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035461118] [2021-02-21 20:30:22,108 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 20:30:22,108 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-21 20:30:22,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35311127] [2021-02-21 20:30:22,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-21 20:30:22,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-21 20:30:22,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-21 20:30:22,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-02-21 20:30:22,111 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 8 states. [2021-02-21 20:30:22,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 20:30:22,344 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-02-21 20:30:22,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-21 20:30:22,345 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 35 [2021-02-21 20:30:22,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 20:30:22,347 INFO L225 Difference]: With dead ends: 44 [2021-02-21 20:30:22,347 INFO L226 Difference]: Without dead ends: 38 [2021-02-21 20:30:22,349 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-02-21 20:30:22,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-02-21 20:30:22,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-02-21 20:30:22,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-02-21 20:30:22,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-02-21 20:30:22,363 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 35 [2021-02-21 20:30:22,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 20:30:22,364 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-02-21 20:30:22,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-21 20:30:22,364 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-02-21 20:30:22,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-02-21 20:30:22,366 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 20:30:22,366 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 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] [2021-02-21 20:30:22,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-21 20:30:22,367 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 20:30:22,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 20:30:22,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1004193542, now seen corresponding path program 2 times [2021-02-21 20:30:22,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-21 20:30:22,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845101938] [2021-02-21 20:30:22,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 20:30:22,371 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-21 20:30:22,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-21 20:30:22,398 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-21 20:30:22,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-21 20:30:22,444 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-21 20:30:22,481 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-21 20:30:22,481 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-21 20:30:22,482 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-21 20:30:22,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.02 08:30:22 BoogieIcfgContainer [2021-02-21 20:30:22,500 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-21 20:30:22,502 INFO L168 Benchmark]: Toolchain (without parser) took 2734.08 ms. Allocated memory was 169.9 MB in the beginning and 210.8 MB in the end (delta: 40.9 MB). Free memory was 145.5 MB in the beginning and 127.3 MB in the end (delta: 18.3 MB). Peak memory consumption was 60.5 MB. Max. memory is 8.0 GB. [2021-02-21 20:30:22,503 INFO L168 Benchmark]: CDTParser took 1.21 ms. Allocated memory is still 169.9 MB. Free memory is still 143.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-21 20:30:22,504 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.08 ms. Allocated memory is still 169.9 MB. Free memory was 144.4 MB in the beginning and 135.4 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-21 20:30:22,504 INFO L168 Benchmark]: Boogie Preprocessor took 35.48 ms. Allocated memory is still 169.9 MB. Free memory was 135.2 MB in the beginning and 134.0 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-21 20:30:22,505 INFO L168 Benchmark]: RCFGBuilder took 499.16 ms. Allocated memory is still 169.9 MB. Free memory was 134.0 MB in the beginning and 120.3 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-02-21 20:30:22,506 INFO L168 Benchmark]: TraceAbstraction took 1936.16 ms. Allocated memory was 169.9 MB in the beginning and 210.8 MB in the end (delta: 40.9 MB). Free memory was 119.9 MB in the beginning and 127.3 MB in the end (delta: -7.4 MB). Peak memory consumption was 34.3 MB. Max. memory is 8.0 GB. [2021-02-21 20:30:22,510 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.21 ms. Allocated memory is still 169.9 MB. Free memory is still 143.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 240.08 ms. Allocated memory is still 169.9 MB. Free memory was 144.4 MB in the beginning and 135.4 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.48 ms. Allocated memory is still 169.9 MB. Free memory was 135.2 MB in the beginning and 134.0 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 499.16 ms. Allocated memory is still 169.9 MB. Free memory was 134.0 MB in the beginning and 120.3 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1936.16 ms. Allocated memory was 169.9 MB in the beginning and 210.8 MB in the end (delta: 40.9 MB). Free memory was 119.9 MB in the beginning and 127.3 MB in the end (delta: -7.4 MB). Peak memory consumption was 34.3 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 18]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] int a = 2; [L15] int b = 3; [L16] CALL, EXPR sum(a, b) [L6] COND FALSE !(n <= 0) [L9] CALL, EXPR sum(n - 1, m + 1) [L6] COND FALSE !(n <= 0) [L9] CALL, EXPR sum(n - 1, m + 1) [L6] COND TRUE n <= 0 [L7] return m + n; [L9] RET, EXPR sum(n - 1, m + 1) [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) [L9] return sum(n - 1, m + 1); [L16] RET, EXPR sum(a, b) [L16] int result = sum(a, b); [L17] COND TRUE result == a + b [L18] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 55 SDtfs, 76 SDslu, 87 SDs, 0 SdLazy, 128 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 28 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred in iteration=2, 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, 2 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...