/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/nec11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:18:35,541 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:18:35,544 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:18:35,567 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:18:35,568 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:18:35,571 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:18:35,573 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:18:35,585 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:18:35,590 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:18:35,594 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:18:35,595 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:18:35,597 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:18:35,597 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:18:35,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:18:35,602 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:18:35,603 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:18:35,605 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:18:35,606 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:18:35,607 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:18:35,612 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:18:35,618 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:18:35,622 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:18:35,624 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:18:35,624 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:18:35,627 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:18:35,639 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:18:35,640 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:18:35,641 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:18:35,642 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 [2020-07-20 14:18:35,672 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:18:35,672 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:18:35,673 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:18:35,674 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:18:35,674 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:18:35,674 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:18:35,674 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:18:35,674 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:18:35,675 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:18:35,675 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:18:35,675 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:18:35,675 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:18:35,675 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:18:35,676 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:18:35,676 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:18:35,676 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:18:35,676 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:18:35,676 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:18:35,677 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:18:35,677 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:18:35,677 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:18:35,677 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:18:35,677 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:18:35,678 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:18:35,678 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:18:35,678 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:18:35,678 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:18:35,678 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:18:35,679 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:18:35,679 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:18:36,003 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:18:36,020 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:18:36,023 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:18:36,025 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:18:36,025 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:18:36,026 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec11.c [2020-07-20 14:18:36,103 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0c7bc9ad3/0af1a93ec8da445b90a3f9d603c8aafb/FLAG152e1addf [2020-07-20 14:18:36,637 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:18:36,638 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec11.c [2020-07-20 14:18:36,648 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0c7bc9ad3/0af1a93ec8da445b90a3f9d603c8aafb/FLAG152e1addf [2020-07-20 14:18:36,952 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0c7bc9ad3/0af1a93ec8da445b90a3f9d603c8aafb [2020-07-20 14:18:36,962 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:18:36,966 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:18:36,968 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:18:36,968 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:18:36,972 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:18:36,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:18:36" (1/1) ... [2020-07-20 14:18:36,977 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cadc182 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:36, skipping insertion in model container [2020-07-20 14:18:36,977 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:18:36" (1/1) ... [2020-07-20 14:18:36,986 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:18:37,009 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:18:37,233 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:18:37,238 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:18:37,256 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:18:37,271 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:18:37,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37 WrapperNode [2020-07-20 14:18:37,271 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:18:37,272 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:18:37,272 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:18:37,273 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:18:37,283 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,283 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,386 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,391 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,397 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,398 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (1/1) ... [2020-07-20 14:18:37,400 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:18:37,400 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:18:37,400 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:18:37,400 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:18:37,401 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (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 [2020-07-20 14:18:37,462 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:18:37,462 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:18:37,462 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:18:37,463 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:18:37,463 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:18:37,463 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:18:37,463 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 14:18:37,463 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:18:37,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:18:37,464 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:18:37,650 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:18:37,651 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 14:18:37,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:18:37 BoogieIcfgContainer [2020-07-20 14:18:37,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:18:37,666 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:18:37,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:18:37,680 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:18:37,683 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:18:36" (1/3) ... [2020-07-20 14:18:37,684 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cc25315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:18:37, skipping insertion in model container [2020-07-20 14:18:37,686 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:18:37" (2/3) ... [2020-07-20 14:18:37,687 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cc25315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:18:37, skipping insertion in model container [2020-07-20 14:18:37,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:18:37" (3/3) ... [2020-07-20 14:18:37,693 INFO L109 eAbstractionObserver]: Analyzing ICFG nec11.c [2020-07-20 14:18:37,735 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:18:37,750 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:18:37,793 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:18:37,833 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:18:37,833 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:18:37,833 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:18:37,834 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:18:37,834 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:18:37,834 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:18:37,834 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:18:37,834 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:18:37,853 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 14:18:37,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 14:18:37,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:18:37,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:18:37,860 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:18:37,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:18:37,867 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2020-07-20 14:18:37,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:18:37,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324828892] [2020-07-20 14:18:37,875 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-20 14:18:37,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:18:37,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:18:37,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 14:18:37,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:18:37,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:18:37,971 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:18:37,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324828892] [2020-07-20 14:18:37,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:18:37,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 14:18:37,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291477565] [2020-07-20 14:18:37,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 14:18:37,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:18:37,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 14:18:37,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:18:37,993 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-07-20 14:18:38,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:18:38,015 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-07-20 14:18:38,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 14:18:38,017 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 14:18:38,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:18:38,025 INFO L225 Difference]: With dead ends: 32 [2020-07-20 14:18:38,025 INFO L226 Difference]: Without dead ends: 13 [2020-07-20 14:18:38,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:18:38,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-07-20 14:18:38,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-07-20 14:18:38,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-20 14:18:38,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-07-20 14:18:38,067 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-07-20 14:18:38,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:18:38,068 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-07-20 14:18:38,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 14:18:38,068 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-07-20 14:18:38,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 14:18:38,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:18:38,069 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:18:38,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:18:38,286 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:18:38,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:18:38,287 INFO L82 PathProgramCache]: Analyzing trace with hash -158041290, now seen corresponding path program 1 times [2020-07-20 14:18:38,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:18:38,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65098029] [2020-07-20 14:18:38,288 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 [2020-07-20 14:18:38,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:18:38,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 14:18:38,326 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 14:18:38,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 14:18:38,338 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 14:18:38,351 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 14:18:38,352 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 14:18:38,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:18:38,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 02:18:38 BoogieIcfgContainer [2020-07-20 14:18:38,583 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 14:18:38,587 INFO L168 Benchmark]: Toolchain (without parser) took 1621.35 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 102.7 MB in the beginning and 142.0 MB in the end (delta: -39.3 MB). Peak memory consumption was 24.1 MB. Max. memory is 7.1 GB. [2020-07-20 14:18:38,588 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 138.4 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 14:18:38,589 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.23 ms. Allocated memory is still 138.4 MB. Free memory was 102.3 MB in the beginning and 92.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 14:18:38,590 INFO L168 Benchmark]: Boogie Preprocessor took 127.48 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 92.8 MB in the beginning and 181.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-07-20 14:18:38,591 INFO L168 Benchmark]: RCFGBuilder took 264.99 ms. Allocated memory is still 201.9 MB. Free memory was 181.1 MB in the beginning and 168.2 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-07-20 14:18:38,592 INFO L168 Benchmark]: TraceAbstraction took 917.02 ms. Allocated memory is still 201.9 MB. Free memory was 167.5 MB in the beginning and 142.0 MB in the end (delta: 25.5 MB). Peak memory consumption was 25.5 MB. Max. memory is 7.1 GB. [2020-07-20 14:18:38,597 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 138.4 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.23 ms. Allocated memory is still 138.4 MB. Free memory was 102.3 MB in the beginning and 92.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 127.48 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 92.8 MB in the beginning and 181.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 264.99 ms. Allocated memory is still 201.9 MB. Free memory was 181.1 MB in the beginning and 168.2 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 917.02 ms. Allocated memory is still 201.9 MB. Free memory was 167.5 MB in the beginning and 142.0 MB in the end (delta: 25.5 MB). Peak memory consumption was 25.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] int a[5]; [L14] int len=0; [L15] _Bool c=__VERIFIER_nondet_bool(); [L16] int i; VAL [c=0, len=0] [L19] COND FALSE !(\read(c)) VAL [c=0, len=0] [L28] CALL __VERIFIER_assert(len==5) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 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: 21 SDtfs, 0 SDslu, 0 SDs, 0 SdLazy, 0 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=20occurred 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, 20 NumberOfCodeBlocks, 19 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 9 ConstructedInterpolants, 0 QuantifiedInterpolants, 81 SizeOfPredicates, 0 NumberOfNonLiveVariables, 23 ConjunctsInSsa, 1 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...