/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/acceleratedInterpolationWernerOverapprox_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-22 01:50:59,997 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-22 01:51:00,000 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-22 01:51:00,049 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-22 01:51:00,050 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-22 01:51:00,055 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-22 01:51:00,059 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-22 01:51:00,069 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-22 01:51:00,073 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-22 01:51:00,080 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-22 01:51:00,082 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-22 01:51:00,083 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-22 01:51:00,084 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-22 01:51:00,087 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-22 01:51:00,089 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-22 01:51:00,091 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-22 01:51:00,096 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-22 01:51:00,098 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-22 01:51:00,106 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-22 01:51:00,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-22 01:51:00,113 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-22 01:51:00,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-22 01:51:00,119 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-22 01:51:00,121 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-22 01:51:00,136 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-02-22 01:51:00,137 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-02-22 01:51:00,137 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-02-22 01:51:00,138 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-02-22 01:51:00,139 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-02-22 01:51:00,140 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-02-22 01:51:00,140 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-02-22 01:51:00,141 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-02-22 01:51:00,142 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-02-22 01:51:00,143 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-02-22 01:51:00,144 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-02-22 01:51:00,144 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-02-22 01:51:00,145 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-02-22 01:51:00,146 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-02-22 01:51:00,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-22 01:51:00,147 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-22 01:51:00,148 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-22 01:51:00,149 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-22 01:51:00,162 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-22 01:51:00,162 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-22 01:51:00,164 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-22 01:51:00,164 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-22 01:51:00,164 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-22 01:51:00,164 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-22 01:51:00,165 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-22 01:51:00,165 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-22 01:51:00,165 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-22 01:51:00,165 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-22 01:51:00,165 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-22 01:51:00,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-22 01:51:00,166 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-22 01:51:00,166 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-22 01:51:00,166 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-22 01:51:00,167 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-22 01:51:00,167 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-22 01:51:00,167 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-22 01:51:00,167 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 01:51:00,168 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-22 01:51:00,168 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-22 01:51:00,168 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-22 01:51:00,168 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-22 01:51:00,168 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-22 01:51:00,552 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-22 01:51:00,597 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-22 01:51:00,601 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-22 01:51:00,602 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-22 01:51:00,603 INFO L275 PluginConnector]: CDTParser initialized [2021-02-22 01:51:00,604 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2021-02-22 01:51:00,684 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e93158349/601d46fcb3f74e5ebd6e05b06ba90004/FLAG9de772fa2 [2021-02-22 01:51:01,335 INFO L306 CDTParser]: Found 1 translation units. [2021-02-22 01:51:01,336 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2021-02-22 01:51:01,343 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e93158349/601d46fcb3f74e5ebd6e05b06ba90004/FLAG9de772fa2 [2021-02-22 01:51:01,685 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e93158349/601d46fcb3f74e5ebd6e05b06ba90004 [2021-02-22 01:51:01,689 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-22 01:51:01,703 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-22 01:51:01,705 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-22 01:51:01,705 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-22 01:51:01,710 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-22 01:51:01,711 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,712 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6db04ced and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01, skipping insertion in model container [2021-02-22 01:51:01,713 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,722 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-22 01:51:01,738 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-22 01:51:01,894 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] [2021-02-22 01:51:01,898 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 01:51:01,910 INFO L203 MainTranslator]: Completed pre-run [2021-02-22 01:51:01,927 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] [2021-02-22 01:51:01,928 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 01:51:01,946 INFO L208 MainTranslator]: Completed translation [2021-02-22 01:51:01,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01 WrapperNode [2021-02-22 01:51:01,946 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-22 01:51:01,948 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-22 01:51:01,948 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-22 01:51:01,948 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-22 01:51:01,962 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,962 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,970 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,977 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,979 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,980 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (1/1) ... [2021-02-22 01:51:01,982 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-22 01:51:01,984 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-22 01:51:01,984 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-22 01:51:01,984 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-22 01:51:01,985 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (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 [2021-02-22 01:51:02,087 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-22 01:51:02,088 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-22 01:51:02,088 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-22 01:51:02,088 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2021-02-22 01:51:02,088 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-22 01:51:02,088 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-22 01:51:02,089 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-22 01:51:02,089 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-22 01:51:02,089 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-22 01:51:02,089 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2021-02-22 01:51:02,089 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-22 01:51:02,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-22 01:51:02,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-22 01:51:02,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-22 01:51:02,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-22 01:51:02,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-22 01:51:02,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-22 01:51:02,355 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-22 01:51:02,355 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-22 01:51:02,358 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 01:51:02 BoogieIcfgContainer [2021-02-22 01:51:02,358 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-22 01:51:02,360 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-22 01:51:02,360 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-22 01:51:02,365 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-22 01:51:02,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.02 01:51:01" (1/3) ... [2021-02-22 01:51:02,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b34015 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 01:51:02, skipping insertion in model container [2021-02-22 01:51:02,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:51:01" (2/3) ... [2021-02-22 01:51:02,367 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b34015 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 01:51:02, skipping insertion in model container [2021-02-22 01:51:02,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 01:51:02" (3/3) ... [2021-02-22 01:51:02,369 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2021-02-22 01:51:02,377 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-22 01:51:02,383 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-22 01:51:02,429 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-22 01:51:02,516 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-22 01:51:02,517 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-22 01:51:02,517 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-22 01:51:02,517 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-22 01:51:02,517 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-22 01:51:02,517 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-22 01:51:02,517 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-22 01:51:02,518 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-22 01:51:02,550 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2021-02-22 01:51:02,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-22 01:51:02,563 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:51:02,564 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] [2021-02-22 01:51:02,565 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:51:02,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:51:02,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1485133070, now seen corresponding path program 1 times [2021-02-22 01:51:02,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:51:02,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777640733] [2021-02-22 01:51:02,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:51:02,689 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:51:02,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:02,977 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:02,979 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:51:02,981 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:02,985 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,006 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,009 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:51:03,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 01:51:03,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:03,116 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,117 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:51:03,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-22 01:51:03,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:03,160 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,160 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,178 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,180 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-22 01:51:03,193 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,194 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,215 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 01:51:03,217 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777640733] [2021-02-22 01:51:03,219 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 01:51:03,219 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-02-22 01:51:03,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153323520] [2021-02-22 01:51:03,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-22 01:51:03,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 01:51:03,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-22 01:51:03,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-02-22 01:51:03,256 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 7 states. [2021-02-22 01:51:03,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 01:51:03,584 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2021-02-22 01:51:03,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-22 01:51:03,586 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2021-02-22 01:51:03,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 01:51:03,598 INFO L225 Difference]: With dead ends: 48 [2021-02-22 01:51:03,599 INFO L226 Difference]: Without dead ends: 33 [2021-02-22 01:51:03,603 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-22 01:51:03,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-02-22 01:51:03,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-02-22 01:51:03,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-02-22 01:51:03,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-02-22 01:51:03,667 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 26 [2021-02-22 01:51:03,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 01:51:03,668 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-02-22 01:51:03,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-02-22 01:51:03,669 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-02-22 01:51:03,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-02-22 01:51:03,671 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:51:03,672 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] [2021-02-22 01:51:03,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-22 01:51:03,672 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:51:03,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:51:03,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1822905144, now seen corresponding path program 1 times [2021-02-22 01:51:03,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:51:03,674 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664285719] [2021-02-22 01:51:03,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:51:03,678 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:51:03,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:03,729 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,730 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:51:03,731 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,732 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,736 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,737 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:51:03,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 01:51:03,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:03,777 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,778 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:51:03,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-22 01:51:03,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:03,818 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,819 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,827 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,829 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-02-22 01:51:03,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:51:03,872 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,873 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,876 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,878 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-22 01:51:03,890 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:51:03,891 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:51:03,918 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-02-22 01:51:03,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664285719] [2021-02-22 01:51:03,919 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 01:51:03,919 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-22 01:51:03,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145447807] [2021-02-22 01:51:03,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-22 01:51:03,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 01:51:03,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-22 01:51:03,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-02-22 01:51:03,922 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 8 states. [2021-02-22 01:51:04,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 01:51:04,192 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-02-22 01:51:04,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-22 01:51:04,192 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 35 [2021-02-22 01:51:04,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 01:51:04,194 INFO L225 Difference]: With dead ends: 44 [2021-02-22 01:51:04,194 INFO L226 Difference]: Without dead ends: 38 [2021-02-22 01:51:04,196 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 [2021-02-22 01:51:04,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-02-22 01:51:04,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-02-22 01:51:04,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-02-22 01:51:04,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-02-22 01:51:04,210 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 35 [2021-02-22 01:51:04,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 01:51:04,210 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-02-22 01:51:04,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-22 01:51:04,211 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-02-22 01:51:04,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-02-22 01:51:04,212 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:51:04,213 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] [2021-02-22 01:51:04,213 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-22 01:51:04,213 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:51:04,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:51:04,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1004193542, now seen corresponding path program 2 times [2021-02-22 01:51:04,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:51:04,214 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824082368] [2021-02-22 01:51:04,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:51:04,217 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:51:04,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 01:51:04,261 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 01:51:04,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 01:51:04,308 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 01:51:04,355 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-22 01:51:04,355 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-22 01:51:04,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-22 01:51:04,378 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.02 01:51:04 BoogieIcfgContainer [2021-02-22 01:51:04,379 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-22 01:51:04,381 INFO L168 Benchmark]: Toolchain (without parser) took 2688.97 ms. Allocated memory is still 152.0 MB. Free memory was 129.1 MB in the beginning and 90.3 MB in the end (delta: 38.8 MB). Peak memory consumption was 39.3 MB. Max. memory is 8.0 GB. [2021-02-22 01:51:04,381 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 152.0 MB. Free memory is still 127.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 01:51:04,383 INFO L168 Benchmark]: CACSL2BoogieTranslator took 241.96 ms. Allocated memory is still 152.0 MB. Free memory was 128.1 MB in the beginning and 118.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-22 01:51:04,385 INFO L168 Benchmark]: Boogie Preprocessor took 34.94 ms. Allocated memory is still 152.0 MB. Free memory was 118.9 MB in the beginning and 117.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-22 01:51:04,386 INFO L168 Benchmark]: RCFGBuilder took 374.46 ms. Allocated memory is still 152.0 MB. Free memory was 117.7 MB in the beginning and 104.0 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-02-22 01:51:04,393 INFO L168 Benchmark]: TraceAbstraction took 2018.63 ms. Allocated memory is still 152.0 MB. Free memory was 103.6 MB in the beginning and 90.3 MB in the end (delta: 13.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 8.0 GB. [2021-02-22 01:51:04,396 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 152.0 MB. Free memory is still 127.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 241.96 ms. Allocated memory is still 152.0 MB. Free memory was 128.1 MB in the beginning and 118.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.94 ms. Allocated memory is still 152.0 MB. Free memory was 118.9 MB in the beginning and 117.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 374.46 ms. Allocated memory is still 152.0 MB. Free memory was 117.7 MB in the beginning and 104.0 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2018.63 ms. Allocated memory is still 152.0 MB. Free memory was 103.6 MB in the beginning and 90.3 MB in the end (delta: 13.2 MB). Peak memory consumption was 14.1 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: 1.8s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.6s, 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, 0.3s 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...