/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/loops/n.c40.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-22 02:20:53,038 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-22 02:20:53,041 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-22 02:20:53,080 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-22 02:20:53,081 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-22 02:20:53,082 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-22 02:20:53,084 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-22 02:20:53,086 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-22 02:20:53,088 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-22 02:20:53,089 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-22 02:20:53,090 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-22 02:20:53,091 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-22 02:20:53,092 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-22 02:20:53,093 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-22 02:20:53,094 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-22 02:20:53,096 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-22 02:20:53,097 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-22 02:20:53,098 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-22 02:20:53,100 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-22 02:20:53,102 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-22 02:20:53,104 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-22 02:20:53,107 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-22 02:20:53,109 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-22 02:20:53,110 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-22 02:20:53,113 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-22 02:20:53,122 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-22 02:20:53,123 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-22 02:20:53,124 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-22 02:20:53,125 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 02:20:53,137 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-22 02:20:53,138 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-22 02:20:53,139 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-22 02:20:53,140 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-22 02:20:53,140 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-22 02:20:53,140 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-22 02:20:53,140 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-22 02:20:53,141 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-22 02:20:53,141 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-22 02:20:53,141 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-22 02:20:53,141 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-22 02:20:53,141 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-22 02:20:53,142 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-22 02:20:53,142 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-22 02:20:53,142 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-22 02:20:53,142 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-22 02:20:53,143 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-22 02:20:53,143 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-22 02:20:53,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 02:20:53,143 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-22 02:20:53,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-22 02:20:53,144 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-22 02:20:53,144 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-22 02:20:53,144 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-22 02:20:53,536 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-22 02:20:53,569 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-22 02:20:53,572 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-22 02:20:53,573 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-22 02:20:53,574 INFO L275 PluginConnector]: CDTParser initialized [2021-02-22 02:20:53,575 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/n.c40.c [2021-02-22 02:20:53,663 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/534bf4566/1c1afd46c20740208c4eb7eb0d5a43b4/FLAGdf97d8fb5 [2021-02-22 02:20:54,328 INFO L306 CDTParser]: Found 1 translation units. [2021-02-22 02:20:54,330 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c40.c [2021-02-22 02:20:54,337 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/534bf4566/1c1afd46c20740208c4eb7eb0d5a43b4/FLAGdf97d8fb5 [2021-02-22 02:20:54,713 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/534bf4566/1c1afd46c20740208c4eb7eb0d5a43b4 [2021-02-22 02:20:54,716 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-22 02:20:54,732 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-22 02:20:54,738 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-22 02:20:54,738 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-22 02:20:54,742 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-22 02:20:54,743 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:54,744 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d649ef2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54, skipping insertion in model container [2021-02-22 02:20:54,745 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:54,753 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-22 02:20:54,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-22 02:20:54,923 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c40.c[498,511] [2021-02-22 02:20:54,932 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:20:54,945 INFO L203 MainTranslator]: Completed pre-run [2021-02-22 02:20:54,963 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c40.c[498,511] [2021-02-22 02:20:54,964 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:20:54,982 INFO L208 MainTranslator]: Completed translation [2021-02-22 02:20:54,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54 WrapperNode [2021-02-22 02:20:54,983 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-22 02:20:54,984 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-22 02:20:54,984 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-22 02:20:54,984 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-22 02:20:54,997 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:54,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:55,005 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:55,006 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:55,014 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:55,018 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:55,019 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (1/1) ... [2021-02-22 02:20:55,022 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-22 02:20:55,023 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-22 02:20:55,023 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-22 02:20:55,023 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-22 02:20:55,024 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (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 02:20:55,121 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-22 02:20:55,121 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-22 02:20:55,121 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-22 02:20:55,121 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-22 02:20:55,121 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-22 02:20:55,122 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-22 02:20:55,122 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-22 02:20:55,122 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-22 02:20:55,122 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-02-22 02:20:55,122 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-22 02:20:55,122 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-22 02:20:55,123 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-22 02:20:55,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-22 02:20:55,123 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-22 02:20:55,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-22 02:20:55,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-22 02:20:55,387 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-22 02:20:55,387 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-22 02:20:55,390 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:20:55 BoogieIcfgContainer [2021-02-22 02:20:55,390 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-22 02:20:55,392 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-22 02:20:55,392 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-22 02:20:55,395 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-22 02:20:55,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.02 02:20:54" (1/3) ... [2021-02-22 02:20:55,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d59e2f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:20:55, skipping insertion in model container [2021-02-22 02:20:55,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:20:54" (2/3) ... [2021-02-22 02:20:55,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d59e2f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:20:55, skipping insertion in model container [2021-02-22 02:20:55,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:20:55" (3/3) ... [2021-02-22 02:20:55,399 INFO L111 eAbstractionObserver]: Analyzing ICFG n.c40.c [2021-02-22 02:20:55,407 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-22 02:20:55,411 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-22 02:20:55,434 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-22 02:20:55,467 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-22 02:20:55,467 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-22 02:20:55,470 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-22 02:20:55,470 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-22 02:20:55,470 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-22 02:20:55,471 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-22 02:20:55,471 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-22 02:20:55,471 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-22 02:20:55,506 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2021-02-22 02:20:55,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-02-22 02:20:55,530 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:20:55,531 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] [2021-02-22 02:20:55,532 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:20:55,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:20:55,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1065949594, now seen corresponding path program 1 times [2021-02-22 02:20:55,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:20:55,573 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403905754] [2021-02-22 02:20:55,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:20:55,676 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:20:55,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:20:55,873 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:55,875 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:20:55,877 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:55,878 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:20:56,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:20:56,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:20:56,042 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,043 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:20:56,056 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 02:20:56,058 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403905754] [2021-02-22 02:20:56,060 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:20:56,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-22 02:20:56,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908245549] [2021-02-22 02:20:56,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-22 02:20:56,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:20:56,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-22 02:20:56,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-22 02:20:56,085 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2021-02-22 02:20:56,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:20:56,213 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2021-02-22 02:20:56,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-22 02:20:56,215 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2021-02-22 02:20:56,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:20:56,225 INFO L225 Difference]: With dead ends: 60 [2021-02-22 02:20:56,225 INFO L226 Difference]: Without dead ends: 40 [2021-02-22 02:20:56,229 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-22 02:20:56,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-02-22 02:20:56,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-02-22 02:20:56,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2021-02-22 02:20:56,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2021-02-22 02:20:56,279 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 30 [2021-02-22 02:20:56,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:20:56,280 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2021-02-22 02:20:56,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-22 02:20:56,280 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2021-02-22 02:20:56,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-22 02:20:56,282 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:20:56,282 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] [2021-02-22 02:20:56,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-22 02:20:56,283 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:20:56,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:20:56,284 INFO L82 PathProgramCache]: Analyzing trace with hash -896359144, now seen corresponding path program 1 times [2021-02-22 02:20:56,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:20:56,284 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638147286] [2021-02-22 02:20:56,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:20:56,288 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:20:56,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:20:56,362 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,363 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:20:56,364 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,365 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 02:20:56,369 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,403 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:20:56,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:20:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:20:56,481 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,482 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:20:56,488 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 02:20:56,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638147286] [2021-02-22 02:20:56,491 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:20:56,492 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-22 02:20:56,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174494520] [2021-02-22 02:20:56,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-22 02:20:56,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:20:56,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-22 02:20:56,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-22 02:20:56,494 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 4 states. [2021-02-22 02:20:56,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:20:56,646 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2021-02-22 02:20:56,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-22 02:20:56,646 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2021-02-22 02:20:56,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:20:56,648 INFO L225 Difference]: With dead ends: 56 [2021-02-22 02:20:56,649 INFO L226 Difference]: Without dead ends: 48 [2021-02-22 02:20:56,650 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-22 02:20:56,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-02-22 02:20:56,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-02-22 02:20:56,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2021-02-22 02:20:56,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2021-02-22 02:20:56,662 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 32 [2021-02-22 02:20:56,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:20:56,663 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2021-02-22 02:20:56,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-02-22 02:20:56,663 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2021-02-22 02:20:56,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-02-22 02:20:56,664 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:20:56,664 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-22 02:20:56,665 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-22 02:20:56,665 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:20:56,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:20:56,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1266891123, now seen corresponding path program 1 times [2021-02-22 02:20:56,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:20:56,666 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301229767] [2021-02-22 02:20:56,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:20:56,700 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,713 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-02-22 02:20:56,720 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,723 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-02-22 02:20:56,731 WARN L141 QuantifierPusher]: treesize reduction 2, result has 93.1 percent of original size [2021-02-22 02:20:56,745 WARN L147 QuantifierPusher]: treesize reduction 2, result has 93.1 percent of original size 27 [2021-02-22 02:20:56,751 WARN L141 QuantifierPusher]: treesize reduction 23, result has 65.7 percent of original size [2021-02-22 02:20:56,754 WARN L147 QuantifierPusher]: treesize reduction 23, result has 65.7 percent of original size 44 [2021-02-22 02:20:56,756 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,759 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-02-22 02:20:56,760 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:20:56,763 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-02-22 02:20:56,767 WARN L141 QuantifierPusher]: treesize reduction 2, result has 93.1 percent of original size [2021-02-22 02:20:56,770 WARN L147 QuantifierPusher]: treesize reduction 2, result has 93.1 percent of original size 27 [2021-02-22 02:20:56,774 WARN L141 QuantifierPusher]: treesize reduction 23, result has 65.7 percent of original size [2021-02-22 02:20:56,777 WARN L147 QuantifierPusher]: treesize reduction 23, result has 65.7 percent of original size 44 [2021-02-22 02:20:56,777 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-22 02:20:56,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 02:20:56,837 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 02:20:56,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 02:20:56,916 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 02:20:56,960 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-22 02:20:56,960 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-22 02:20:56,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-22 02:20:56,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.02 02:20:56 BoogieIcfgContainer [2021-02-22 02:20:56,978 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-22 02:20:56,979 INFO L168 Benchmark]: Toolchain (without parser) took 2260.26 ms. Allocated memory is still 153.1 MB. Free memory was 129.4 MB in the beginning and 85.0 MB in the end (delta: 44.4 MB). Peak memory consumption was 45.2 MB. Max. memory is 8.0 GB. [2021-02-22 02:20:56,980 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 153.1 MB. Free memory is still 132.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 02:20:56,981 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.28 ms. Allocated memory is still 153.1 MB. Free memory was 128.4 MB in the beginning and 118.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-22 02:20:56,982 INFO L168 Benchmark]: Boogie Preprocessor took 38.01 ms. Allocated memory is still 153.1 MB. Free memory was 118.9 MB in the beginning and 117.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-22 02:20:56,982 INFO L168 Benchmark]: RCFGBuilder took 367.43 ms. Allocated memory is still 153.1 MB. Free memory was 117.4 MB in the beginning and 100.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-02-22 02:20:56,983 INFO L168 Benchmark]: TraceAbstraction took 1586.36 ms. Allocated memory is still 153.1 MB. Free memory was 100.1 MB in the beginning and 85.0 MB in the end (delta: 15.1 MB). Peak memory consumption was 15.8 MB. Max. memory is 8.0 GB. [2021-02-22 02:20:56,987 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 153.1 MB. Free memory is still 132.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 245.28 ms. Allocated memory is still 153.1 MB. Free memory was 128.4 MB in the beginning and 118.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 38.01 ms. Allocated memory is still 153.1 MB. Free memory was 118.9 MB in the beginning and 117.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 367.43 ms. Allocated memory is still 153.1 MB. Free memory was 117.4 MB in the beginning and 100.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1586.36 ms. Allocated memory is still 153.1 MB. Free memory was 100.1 MB in the beginning and 85.0 MB in the end (delta: 15.1 MB). Peak memory consumption was 15.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 22]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L7] char x[100], y[100]; [L8] int i,j,k; [L11] k = __VERIFIER_nondet_int() [L13] i = 0 [L14] EXPR x[i] [L14] COND TRUE x[i] != 0 [L15] EXPR x[i] [L15] y[i] = x[i] [L16] i++ [L14] EXPR x[i] [L14] COND FALSE !(x[i] != 0) [L18] y[i] = 0 [L20] COND TRUE k >= 0 && k < i [L21] EXPR y[k] [L21] COND TRUE y[k] == 0 [L22] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 50 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.5s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 82 SDtfs, 16 SDslu, 30 SDs, 0 SdLazy, 86 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=0, 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, 6 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...