/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:39:34,530 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:39:34,532 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:39:34,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:39:34,544 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:39:34,546 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:39:34,547 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:39:34,549 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:39:34,550 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:39:34,551 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:39:34,552 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:39:34,553 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:39:34,553 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:39:34,554 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:39:34,555 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:39:34,557 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:39:34,557 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:39:34,558 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:39:34,560 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:39:34,562 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:39:34,564 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:39:34,568 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:39:34,569 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:39:34,570 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:39:34,574 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:39:34,575 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:39:34,575 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:39:34,576 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:39:34,576 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:39:34,580 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-21 11:39:34,584 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:39:34,585 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:39:34,586 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:39:34,587 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:39:34,601 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:39:34,601 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:39:34,602 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:39:34,603 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:39:34,603 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:39:34,603 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:39:34,603 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:39:34,603 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:39:34,604 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:39:34,604 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:39:34,604 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:39:34,604 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:39:34,604 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:39:34,605 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:39:34,605 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:39:34,605 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:39:34,605 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:39:34,605 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:39:34,606 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:39:34,606 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:39:34,606 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:39:34,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:39:34,606 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:39:34,607 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:39:34,607 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:39:34,607 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:39:34,607 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:34,607 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:39:34,608 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:39:34,608 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:39:34,880 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:39:34,895 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:39:34,898 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:39:34,899 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:39:34,906 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:39:34,907 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2020-07-21 11:39:34,980 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89f9fce33/3f847d243eb541deb933298aafd2f77a/FLAGd0f1fb396 [2020-07-21 11:39:35,404 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:39:35,405 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c [2020-07-21 11:39:35,411 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89f9fce33/3f847d243eb541deb933298aafd2f77a/FLAGd0f1fb396 [2020-07-21 11:39:35,803 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89f9fce33/3f847d243eb541deb933298aafd2f77a [2020-07-21 11:39:35,813 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:39:35,816 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:39:35,817 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:39:35,817 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:39:35,821 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:39:35,822 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:39:35" (1/1) ... [2020-07-21 11:39:35,825 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f41f43f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:35, skipping insertion in model container [2020-07-21 11:39:35,825 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:39:35" (1/1) ... [2020-07-21 11:39:35,832 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:39:35,849 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:39:36,005 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:39:36,009 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:39:36,026 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:39:36,040 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:39:36,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36 WrapperNode [2020-07-21 11:39:36,041 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:39:36,042 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:39:36,042 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:39:36,042 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:39:36,054 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,055 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,141 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,141 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,150 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,158 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,159 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (1/1) ... [2020-07-21 11:39:36,161 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:39:36,161 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:39:36,161 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:39:36,162 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:39:36,163 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (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 [2020-07-21 11:39:36,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:39:36,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:39:36,221 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:39:36,221 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:39:36,222 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:39:36,446 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:39:36,446 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:39:36,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:39:36 BoogieIcfgContainer [2020-07-21 11:39:36,450 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:39:36,451 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:39:36,451 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:39:36,455 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:39:36,455 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:39:35" (1/3) ... [2020-07-21 11:39:36,456 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@195d7dcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:39:36, skipping insertion in model container [2020-07-21 11:39:36,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:36" (2/3) ... [2020-07-21 11:39:36,457 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@195d7dcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:39:36, skipping insertion in model container [2020-07-21 11:39:36,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:39:36" (3/3) ... [2020-07-21 11:39:36,463 INFO L109 eAbstractionObserver]: Analyzing ICFG nec20.c [2020-07-21 11:39:36,486 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:39:36,504 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:39:36,538 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:39:36,578 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:39:36,579 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:39:36,579 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:39:36,579 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:39:36,579 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:39:36,579 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:39:36,580 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:39:36,580 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:39:36,603 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 11:39:36,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 11:39:36,609 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:36,610 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:36,611 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:36,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:36,617 INFO L82 PathProgramCache]: Analyzing trace with hash -676339564, now seen corresponding path program 1 times [2020-07-21 11:39:36,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:36,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430902794] [2020-07-21 11:39:36,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:36,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:36,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:39:36,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:36,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:36,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:39:36,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430902794] [2020-07-21 11:39:36,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:39:36,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:39:36,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396895812] [2020-07-21 11:39:36,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:39:36,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:36,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:39:36,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:39:36,775 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-07-21 11:39:36,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:36,815 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2020-07-21 11:39:36,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:39:36,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-21 11:39:36,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:36,825 INFO L225 Difference]: With dead ends: 43 [2020-07-21 11:39:36,825 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 11:39:36,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:39:36,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 11:39:36,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 11:39:36,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 11:39:36,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-07-21 11:39:36,866 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2020-07-21 11:39:36,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:36,866 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-07-21 11:39:36,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:39:36,867 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-07-21 11:39:36,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 11:39:36,868 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:36,868 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:37,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:37,082 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:37,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:37,084 INFO L82 PathProgramCache]: Analyzing trace with hash 2087974871, now seen corresponding path program 1 times [2020-07-21 11:39:37,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:37,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028229203] [2020-07-21 11:39:37,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:37,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:39:37,129 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:39:37,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:39:37,143 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:39:37,158 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:39:37,158 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:39:37,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:37,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:39:37 BoogieIcfgContainer [2020-07-21 11:39:37,386 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:39:37,389 INFO L168 Benchmark]: Toolchain (without parser) took 1573.00 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 102.1 MB in the beginning and 134.3 MB in the end (delta: -32.2 MB). Peak memory consumption was 31.7 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:37,390 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 11:39:37,391 INFO L168 Benchmark]: CACSL2BoogieTranslator took 224.21 ms. Allocated memory is still 137.4 MB. Free memory was 101.6 MB in the beginning and 91.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:37,392 INFO L168 Benchmark]: Boogie Preprocessor took 119.20 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 91.8 MB in the beginning and 180.0 MB in the end (delta: -88.2 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:37,394 INFO L168 Benchmark]: RCFGBuilder took 288.69 ms. Allocated memory is still 201.3 MB. Free memory was 179.3 MB in the beginning and 165.3 MB in the end (delta: 14.0 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:37,395 INFO L168 Benchmark]: TraceAbstraction took 934.67 ms. Allocated memory is still 201.3 MB. Free memory was 165.3 MB in the beginning and 134.3 MB in the end (delta: 31.1 MB). Peak memory consumption was 31.1 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:37,399 INFO L336 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 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 224.21 ms. Allocated memory is still 137.4 MB. Free memory was 101.6 MB in the beginning and 91.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.20 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 91.8 MB in the beginning and 180.0 MB in the end (delta: -88.2 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 288.69 ms. Allocated memory is still 201.3 MB. Free memory was 179.3 MB in the beginning and 165.3 MB in the end (delta: 14.0 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 934.67 ms. Allocated memory is still 201.3 MB. Free memory was 165.3 MB in the beginning and 134.3 MB in the end (delta: 31.1 MB). Peak memory consumption was 31.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int b; VAL [\old(b)=2, b=0] [L13] _Bool k=__VERIFIER_nondet_bool(); [L14] unsigned int i,n,j; [L15] int a[1025]; VAL [b=0, k=1] [L17] COND TRUE \read(k) [L18] n=0 VAL [b=0, k=1, n=0] [L23] i=0 [L24] j=__VERIFIER_nondet_uint() [L25] COND FALSE !(j > 10000) VAL [b=0, i=0, j=-4294957296, k=1, n=0] [L28] COND TRUE i <= n [L29] i++ [L30] j= j +2 VAL [b=0, i=1, j=-4294957294, k=1, n=0] [L28] COND FALSE !(i <= n) VAL [b=0, i=1, j=-4294957294, k=1, n=0] [L33] a[i]=0 VAL [b=0, i=1, j=-4294957294, k=1, n=0] [L34] CALL __VERIFIER_assert(j<1025) VAL [\old(cond)=0, b=0] [L5] COND TRUE !(cond) VAL [\old(cond)=0, b=0, cond=0] [L6] __VERIFIER_error() VAL [\old(cond)=0, b=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 2 SDslu, 21 SDs, 0 SdLazy, 5 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred 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: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 31 NumberOfCodeBlocks, 31 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 14 ConstructedInterpolants, 0 QuantifiedInterpolants, 252 SizeOfPredicates, 2 NumberOfNonLiveVariables, 35 ConjunctsInSsa, 3 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...