/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/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:39:46,541 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:39:46,544 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:39:46,566 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:39:46,566 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:39:46,567 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:39:46,569 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:39:46,583 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:39:46,585 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:39:46,586 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:39:46,587 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:39:46,588 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:39:46,588 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:39:46,589 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:39:46,591 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:39:46,592 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:39:46,593 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:39:46,594 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:39:46,595 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:39:46,597 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:39:46,599 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:39:46,600 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:39:46,601 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:39:46,602 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:39:46,604 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:39:46,604 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:39:46,605 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:39:46,606 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:39:46,606 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:39:46,607 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-21 11:39:46,613 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:39:46,614 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:39:46,614 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:39:46,615 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 11:39:46,630 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:39:46,630 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:39:46,632 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:39:46,632 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:39:46,632 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:39:46,633 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:39:46,633 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:39:46,633 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:39:46,633 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:39:46,633 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:39:46,634 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:39:46,634 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:39:46,634 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:39:46,634 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:39:46,634 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:39:46,635 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:39:46,635 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:39:46,635 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:39:46,635 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:39:46,635 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:39:46,636 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:39:46,636 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:39:46,636 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:39:46,636 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:39:46,636 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:39:46,637 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:39:46,637 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:46,637 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:39:46,637 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:39:46,637 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 11:39:46,916 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:39:46,933 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:39:46,937 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:39:46,938 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:39:46,939 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:39:46,939 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2020-07-21 11:39:47,002 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9397b7824/ff3f8b6b5a5e4e1692f7623cbcaa70a6/FLAG878fb85f2 [2020-07-21 11:39:47,456 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:39:47,456 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2020-07-21 11:39:47,462 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9397b7824/ff3f8b6b5a5e4e1692f7623cbcaa70a6/FLAG878fb85f2 [2020-07-21 11:39:47,859 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9397b7824/ff3f8b6b5a5e4e1692f7623cbcaa70a6 [2020-07-21 11:39:47,870 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:39:47,874 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:39:47,875 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:39:47,875 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:39:47,879 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:39:47,880 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:39:47" (1/1) ... [2020-07-21 11:39:47,884 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43933f30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:47, skipping insertion in model container [2020-07-21 11:39:47,884 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:39:47" (1/1) ... [2020-07-21 11:39:47,893 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:39:47,912 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:39:48,100 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:39:48,105 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:39:48,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:39:48,138 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:39:48,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48 WrapperNode [2020-07-21 11:39:48,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:39:48,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:39:48,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:39:48,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:39:48,155 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,155 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,161 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,161 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,165 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,170 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,172 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (1/1) ... [2020-07-21 11:39:48,251 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:39:48,252 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:39:48,252 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:39:48,252 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:39:48,253 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (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 11:39:48,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:39:48,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:39:48,307 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:39:48,307 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:39:48,308 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:39:48,308 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:39:48,308 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 11:39:48,308 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:39:48,308 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:39:48,308 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:39:48,506 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:39:48,507 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:39:48,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:39:48 BoogieIcfgContainer [2020-07-21 11:39:48,511 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:39:48,512 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:39:48,513 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:39:48,516 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:39:48,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:39:47" (1/3) ... [2020-07-21 11:39:48,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fcc656d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:39:48, skipping insertion in model container [2020-07-21 11:39:48,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:39:48" (2/3) ... [2020-07-21 11:39:48,518 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fcc656d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:39:48, skipping insertion in model container [2020-07-21 11:39:48,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:39:48" (3/3) ... [2020-07-21 11:39:48,520 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2020-07-21 11:39:48,533 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:39:48,542 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:39:48,558 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:39:48,587 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:39:48,587 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:39:48,587 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:39:48,587 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:39:48,588 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:39:48,588 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:39:48,588 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:39:48,588 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:39:48,616 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 11:39:48,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 11:39:48,626 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:48,627 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:48,627 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:48,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:48,639 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2020-07-21 11:39:48,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:48,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318842598] [2020-07-21 11:39:48,652 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 11:39:48,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:48,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:39:48,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:48,764 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 11:39:48,764 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:39:48,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318842598] [2020-07-21 11:39:48,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:39:48,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:39:48,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032176307] [2020-07-21 11:39:48,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:39:48,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:48,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:39:48,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:39:48,791 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-07-21 11:39:48,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:48,816 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2020-07-21 11:39:48,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:39:48,817 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 11:39:48,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:48,826 INFO L225 Difference]: With dead ends: 31 [2020-07-21 11:39:48,826 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 11:39:48,830 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 [2020-07-21 11:39:48,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 11:39:48,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 11:39:48,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 11:39:48,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-07-21 11:39:48,864 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-07-21 11:39:48,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:48,865 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-07-21 11:39:48,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:39:48,865 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-07-21 11:39:48,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 11:39:48,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:48,866 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:49,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:49,082 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:49,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:49,084 INFO L82 PathProgramCache]: Analyzing trace with hash -158964811, now seen corresponding path program 1 times [2020-07-21 11:39:49,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:49,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574416720] [2020-07-21 11:39:49,085 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 11:39:49,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:49,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:39:49,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:49,175 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 11:39:49,176 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:39:49,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574416720] [2020-07-21 11:39:49,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:39:49,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:39:49,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851745691] [2020-07-21 11:39:49,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:39:49,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:49,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:39:49,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:39:49,180 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2020-07-21 11:39:49,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:49,227 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-07-21 11:39:49,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:39:49,228 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-07-21 11:39:49,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:49,229 INFO L225 Difference]: With dead ends: 23 [2020-07-21 11:39:49,230 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 11:39:49,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:39:49,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 11:39:49,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 11:39:49,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 11:39:49,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-21 11:39:49,237 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 10 [2020-07-21 11:39:49,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:49,238 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-21 11:39:49,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:39:49,238 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-21 11:39:49,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 11:39:49,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:49,239 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:49,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:49,449 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:49,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:49,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1017948080, now seen corresponding path program 1 times [2020-07-21 11:39:49,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:49,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592079758] [2020-07-21 11:39:49,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:49,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:49,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:39:49,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:49,590 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 11:39:49,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:49,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:49,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:39:49,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:49,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592079758] [2020-07-21 11:39:49,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:39:49,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 11:39:49,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252342459] [2020-07-21 11:39:49,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:39:49,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:49,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:39:49,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:39:49,811 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 14 states. [2020-07-21 11:39:50,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:50,127 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-21 11:39:50,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 11:39:50,128 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2020-07-21 11:39:50,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:50,129 INFO L225 Difference]: With dead ends: 39 [2020-07-21 11:39:50,129 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 11:39:50,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:39:50,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 11:39:50,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2020-07-21 11:39:50,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 11:39:50,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 11:39:50,137 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2020-07-21 11:39:50,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:50,138 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 11:39:50,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:39:50,138 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 11:39:50,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 11:39:50,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:50,139 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:50,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:50,340 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:50,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:50,341 INFO L82 PathProgramCache]: Analyzing trace with hash -852639511, now seen corresponding path program 1 times [2020-07-21 11:39:50,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:50,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711491874] [2020-07-21 11:39:50,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:50,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:50,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:39:50,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:50,393 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 11:39:50,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:39:50,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711491874] [2020-07-21 11:39:50,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:39:50,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:39:50,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747339550] [2020-07-21 11:39:50,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:39:50,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:50,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:39:50,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:39:50,397 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 3 states. [2020-07-21 11:39:50,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:50,421 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-07-21 11:39:50,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:39:50,422 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 11:39:50,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:50,423 INFO L225 Difference]: With dead ends: 36 [2020-07-21 11:39:50,423 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 11:39:50,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 11:39:50,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 11:39:50,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 11:39:50,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 11:39:50,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-07-21 11:39:50,434 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-07-21 11:39:50,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:50,434 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-07-21 11:39:50,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:39:50,434 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-07-21 11:39:50,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 11:39:50,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:50,435 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:50,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:50,648 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:50,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:50,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1920151575, now seen corresponding path program 2 times [2020-07-21 11:39:50,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:50,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335157901] [2020-07-21 11:39:50,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:50,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:50,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:39:50,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:50,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:50,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:50,745 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:50,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335157901] [2020-07-21 11:39:50,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:39:50,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 11:39:50,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904312206] [2020-07-21 11:39:50,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:39:50,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:50,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:39:50,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:39:50,748 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 8 states. [2020-07-21 11:39:50,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:50,806 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 11:39:50,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:39:50,807 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-07-21 11:39:50,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:50,808 INFO L225 Difference]: With dead ends: 36 [2020-07-21 11:39:50,808 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 11:39:50,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:39:50,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 11:39:50,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-07-21 11:39:50,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 11:39:50,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 11:39:50,815 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2020-07-21 11:39:50,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:50,815 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 11:39:50,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:39:50,815 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 11:39:50,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 11:39:50,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:50,817 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:51,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:51,027 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:51,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:51,029 INFO L82 PathProgramCache]: Analyzing trace with hash -971600090, now seen corresponding path program 2 times [2020-07-21 11:39:51,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:51,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876765280] [2020-07-21 11:39:51,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:51,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:51,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:39:51,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:51,204 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 11:39:51,238 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:51,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:51,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:39:51,618 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:51,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876765280] [2020-07-21 11:39:51,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:39:51,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 11:39:51,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810649207] [2020-07-21 11:39:51,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 11:39:51,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:51,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 11:39:51,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:39:51,624 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 22 states. [2020-07-21 11:39:52,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:52,508 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2020-07-21 11:39:52,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 11:39:52,513 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2020-07-21 11:39:52,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:52,516 INFO L225 Difference]: With dead ends: 44 [2020-07-21 11:39:52,516 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 11:39:52,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=1058, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 11:39:52,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 11:39:52,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2020-07-21 11:39:52,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 11:39:52,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-21 11:39:52,525 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2020-07-21 11:39:52,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:52,525 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-21 11:39:52,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 11:39:52,526 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-21 11:39:52,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 11:39:52,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:52,527 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:52,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:52,728 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:52,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:52,729 INFO L82 PathProgramCache]: Analyzing trace with hash -131462049, now seen corresponding path program 3 times [2020-07-21 11:39:52,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:52,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180101062] [2020-07-21 11:39:52,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:52,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:39:52,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 11:39:52,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:39:52,830 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:52,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:39:52,926 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:39:52,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180101062] [2020-07-21 11:39:52,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:39:52,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-21 11:39:52,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211491160] [2020-07-21 11:39:52,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 11:39:52,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:39:52,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 11:39:52,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:39:52,930 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 16 states. [2020-07-21 11:39:53,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:39:53,019 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-07-21 11:39:53,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:39:53,021 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2020-07-21 11:39:53,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:39:53,022 INFO L225 Difference]: With dead ends: 46 [2020-07-21 11:39:53,022 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 11:39:53,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:39:53,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 11:39:53,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-07-21 11:39:53,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 11:39:53,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-21 11:39:53,031 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 26 [2020-07-21 11:39:53,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:39:53,034 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-21 11:39:53,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 11:39:53,035 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-21 11:39:53,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 11:39:53,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:39:53,036 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:39:53,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:53,237 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:39:53,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:39:53,237 INFO L82 PathProgramCache]: Analyzing trace with hash -682200363, now seen corresponding path program 4 times [2020-07-21 11:39:53,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:39:53,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224262133] [2020-07-21 11:39:53,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:53,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:39:53,265 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:39:53,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:39:53,275 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:39:53,293 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:39:53,293 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:39:53,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:39:53,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:39:53 BoogieIcfgContainer [2020-07-21 11:39:53,531 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:39:53,533 INFO L168 Benchmark]: Toolchain (without parser) took 5661.04 ms. Allocated memory was 136.8 MB in the beginning and 249.6 MB in the end (delta: 112.7 MB). Free memory was 101.7 MB in the beginning and 207.5 MB in the end (delta: -105.8 MB). Peak memory consumption was 6.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:53,534 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 11:39:53,535 INFO L168 Benchmark]: CACSL2BoogieTranslator took 264.27 ms. Allocated memory is still 136.8 MB. Free memory was 101.3 MB in the beginning and 92.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:53,536 INFO L168 Benchmark]: Boogie Preprocessor took 111.56 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 92.0 MB in the beginning and 180.8 MB in the end (delta: -88.8 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:53,537 INFO L168 Benchmark]: RCFGBuilder took 259.13 ms. Allocated memory is still 200.8 MB. Free memory was 180.8 MB in the beginning and 167.6 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:53,538 INFO L168 Benchmark]: TraceAbstraction took 5018.90 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 166.9 MB in the beginning and 207.5 MB in the end (delta: -40.6 MB). Peak memory consumption was 8.1 MB. Max. memory is 7.1 GB. [2020-07-21 11:39:53,542 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 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 264.27 ms. Allocated memory is still 136.8 MB. Free memory was 101.3 MB in the beginning and 92.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.56 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 92.0 MB in the beginning and 180.8 MB in the end (delta: -88.8 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 259.13 ms. Allocated memory is still 200.8 MB. Free memory was 180.8 MB in the beginning and 167.6 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5018.90 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 166.9 MB in the beginning and 207.5 MB in the end (delta: -40.6 MB). Peak memory consumption was 8.1 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: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, j=10, n=0, n=6] [L13] COND TRUE i<=n VAL [i=1, j=10, n=0, n=6] [L14] COND TRUE i