/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/nec11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-24 04:47:14,189 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-24 04:47:14,194 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-24 04:47:14,237 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-24 04:47:14,266 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-24 04:47:14,274 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-24 04:47:14,276 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-24 04:47:14,278 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-24 04:47:14,279 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-24 04:47:14,281 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-24 04:47:14,286 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-24 04:47:14,293 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-24 04:47:14,295 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-24 04:47:14,297 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-24 04:47:14,298 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-24 04:47:14,299 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-24 04:47:14,302 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-24 04:47:14,312 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-24 04:47:14,313 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-24 04:47:14,314 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-24 04:47:14,316 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-24 04:47:14,329 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-24 04:47:14,329 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-24 04:47:14,331 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-24 04:47:14,331 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-24 04:47:14,331 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-24 04:47:14,332 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-24 04:47:14,332 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-24 04:47:14,332 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-24 04:47:14,332 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-24 04:47:14,332 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-24 04:47:14,333 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-24 04:47:14,333 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-24 04:47:14,333 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-24 04:47:14,333 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-24 04:47:14,334 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-24 04:47:14,334 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-24 04:47:14,334 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-24 04:47:14,334 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-24 04:47:14,334 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-24 04:47:14,335 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-24 04:47:14,335 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-24 04:47:14,335 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-24 04:47:14,335 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-24 04:47:14,336 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-24 04:47:14,758 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-24 04:47:14,782 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-24 04:47:14,784 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-24 04:47:14,785 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-24 04:47:14,791 INFO L275 PluginConnector]: CDTParser initialized [2021-02-24 04:47:14,792 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec11.c [2021-02-24 04:47:14,895 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b7adf2cb/2991df6d1e5747aca7b91946c57c336f/FLAG985a9a4b6 [2021-02-24 04:47:15,539 INFO L306 CDTParser]: Found 1 translation units. [2021-02-24 04:47:15,540 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec11.c [2021-02-24 04:47:15,547 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b7adf2cb/2991df6d1e5747aca7b91946c57c336f/FLAG985a9a4b6 [2021-02-24 04:47:15,913 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b7adf2cb/2991df6d1e5747aca7b91946c57c336f [2021-02-24 04:47:15,916 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-24 04:47:15,929 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-24 04:47:15,932 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-24 04:47:15,932 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-24 04:47:15,936 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-24 04:47:15,937 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 04:47:15" (1/1) ... [2021-02-24 04:47:15,938 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b9ce0f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:15, skipping insertion in model container [2021-02-24 04:47:15,938 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 04:47:15" (1/1) ... [2021-02-24 04:47:15,947 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-24 04:47:15,961 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-24 04:47:16,098 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/nec11.c[317,330] [2021-02-24 04:47:16,115 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-24 04:47:16,125 INFO L203 MainTranslator]: Completed pre-run [2021-02-24 04:47:16,140 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/nec11.c[317,330] [2021-02-24 04:47:16,144 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-24 04:47:16,161 INFO L208 MainTranslator]: Completed translation [2021-02-24 04:47:16,161 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16 WrapperNode [2021-02-24 04:47:16,162 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-24 04:47:16,163 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-24 04:47:16,163 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-24 04:47:16,164 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-24 04:47:16,177 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,178 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,186 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,186 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,192 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,198 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (1/1) ... [2021-02-24 04:47:16,200 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-24 04:47:16,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-24 04:47:16,201 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-24 04:47:16,202 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-24 04:47:16,203 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (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 [2021-02-24 04:47:16,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-24 04:47:16,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-24 04:47:16,314 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-24 04:47:16,314 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-24 04:47:16,315 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-24 04:47:16,315 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-24 04:47:16,315 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-24 04:47:16,316 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-24 04:47:16,316 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-24 04:47:16,316 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-24 04:47:16,316 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2021-02-24 04:47:16,316 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-24 04:47:16,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-24 04:47:16,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-24 04:47:16,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-24 04:47:16,318 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-24 04:47:16,318 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-24 04:47:16,318 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-24 04:47:16,659 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-24 04:47:16,659 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-24 04:47:16,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 04:47:16 BoogieIcfgContainer [2021-02-24 04:47:16,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-24 04:47:16,664 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-24 04:47:16,664 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-24 04:47:16,668 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-24 04:47:16,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 04:47:15" (1/3) ... [2021-02-24 04:47:16,669 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a90c2ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 04:47:16, skipping insertion in model container [2021-02-24 04:47:16,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:16" (2/3) ... [2021-02-24 04:47:16,669 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a90c2ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 04:47:16, skipping insertion in model container [2021-02-24 04:47:16,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 04:47:16" (3/3) ... [2021-02-24 04:47:16,671 INFO L111 eAbstractionObserver]: Analyzing ICFG nec11.c [2021-02-24 04:47:16,678 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-24 04:47:16,684 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-24 04:47:16,723 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-24 04:47:16,750 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-24 04:47:16,750 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-24 04:47:16,751 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-24 04:47:16,751 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-24 04:47:16,751 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-24 04:47:16,751 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-24 04:47:16,751 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-24 04:47:16,751 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-24 04:47:16,768 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2021-02-24 04:47:16,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-24 04:47:16,778 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 04:47:16,779 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] [2021-02-24 04:47:16,780 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 04:47:16,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 04:47:16,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1689601978, now seen corresponding path program 1 times [2021-02-24 04:47:16,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 04:47:16,798 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917237506] [2021-02-24 04:47:16,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 04:47:16,882 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-24 04:47:16,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 04:47:17,000 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:17,002 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 04:47:17,003 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:17,004 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 04:47:17,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 04:47:17,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 04:47:17,105 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:17,106 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 04:47:17,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 04:47:17,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917237506] [2021-02-24 04:47:17,116 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-24 04:47:17,116 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-24 04:47:17,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588388266] [2021-02-24 04:47:17,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-24 04:47:17,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 04:47:17,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-24 04:47:17,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-24 04:47:17,141 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 3 states. [2021-02-24 04:47:17,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 04:47:17,275 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2021-02-24 04:47:17,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-24 04:47:17,278 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2021-02-24 04:47:17,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 04:47:17,289 INFO L225 Difference]: With dead ends: 49 [2021-02-24 04:47:17,290 INFO L226 Difference]: Without dead ends: 29 [2021-02-24 04:47:17,294 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-24 04:47:17,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-02-24 04:47:17,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-02-24 04:47:17,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-02-24 04:47:17,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-02-24 04:47:17,364 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 22 [2021-02-24 04:47:17,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 04:47:17,366 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-02-24 04:47:17,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-24 04:47:17,366 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-02-24 04:47:17,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-24 04:47:17,368 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 04:47:17,368 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] [2021-02-24 04:47:17,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-24 04:47:17,369 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 04:47:17,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 04:47:17,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1675749163, now seen corresponding path program 1 times [2021-02-24 04:47:17,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 04:47:17,374 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005653021] [2021-02-24 04:47:17,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 04:47:17,386 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-24 04:47:17,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-24 04:47:17,419 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-24 04:47:17,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-24 04:47:17,465 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-24 04:47:17,500 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-24 04:47:17,501 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-24 04:47:17,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-24 04:47:17,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.02 04:47:17 BoogieIcfgContainer [2021-02-24 04:47:17,517 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-24 04:47:17,519 INFO L168 Benchmark]: Toolchain (without parser) took 1600.62 ms. Allocated memory is still 166.7 MB. Free memory was 142.5 MB in the beginning and 115.8 MB in the end (delta: 26.7 MB). Peak memory consumption was 28.1 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:17,520 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 166.7 MB. Free memory is still 139.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-24 04:47:17,521 INFO L168 Benchmark]: CACSL2BoogieTranslator took 230.69 ms. Allocated memory is still 166.7 MB. Free memory was 141.3 MB in the beginning and 132.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:17,522 INFO L168 Benchmark]: Boogie Preprocessor took 37.28 ms. Allocated memory is still 166.7 MB. Free memory was 132.1 MB in the beginning and 130.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:17,523 INFO L168 Benchmark]: RCFGBuilder took 460.44 ms. Allocated memory is still 166.7 MB. Free memory was 130.6 MB in the beginning and 116.9 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:17,524 INFO L168 Benchmark]: TraceAbstraction took 853.43 ms. Allocated memory is still 166.7 MB. Free memory was 116.4 MB in the beginning and 115.8 MB in the end (delta: 605.7 kB). Peak memory consumption was 1.9 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:17,528 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 166.7 MB. Free memory is still 139.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 230.69 ms. Allocated memory is still 166.7 MB. Free memory was 141.3 MB in the beginning and 132.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 37.28 ms. Allocated memory is still 166.7 MB. Free memory was 132.1 MB in the beginning and 130.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 460.44 ms. Allocated memory is still 166.7 MB. Free memory was 130.6 MB in the beginning and 116.9 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 853.43 ms. Allocated memory is still 166.7 MB. Free memory was 116.4 MB in the beginning and 115.8 MB in the end (delta: 605.7 kB). Peak memory consumption was 1.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L15] int a[5]; [L16] int len=0; [L17] _Bool c=__VERIFIER_nondet_bool(); [L18] int i; [L21] COND FALSE !(\read(c)) [L30] CALL __VERIFIER_assert(len==5) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 21 SDslu, 4 SDs, 0 SdLazy, 9 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...