/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:20:04,222 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:20:04,225 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:20:04,238 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:20:04,238 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:20:04,239 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:20:04,241 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:20:04,243 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:20:04,245 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:20:04,246 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:20:04,247 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:20:04,248 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:20:04,248 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:20:04,249 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:20:04,252 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:20:04,253 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:20:04,254 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:20:04,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:20:04,263 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:20:04,264 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:20:04,266 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:20:04,267 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:20:04,268 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:20:04,269 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:20:04,271 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:20:04,280 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:20:04,282 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:20:04,282 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:20:04,283 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 20:20:04,298 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:20:04,299 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:20:04,300 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:20:04,300 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:20:04,301 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:20:04,301 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:20:04,301 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:20:04,301 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:20:04,301 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:20:04,302 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:20:04,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:20:04,302 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:20:04,302 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:20:04,302 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:20:04,302 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:20:04,303 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:20:04,303 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:20:04,303 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:20:04,303 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:20:04,303 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:20:04,304 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:20:04,304 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:20:04,304 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:20:04,304 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:20:04,304 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:20:04,305 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:20:04,305 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:04,305 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:20:04,305 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:20:04,305 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 -> DAGSIZE 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 -> 2 [2020-07-21 20:20:04,614 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:20:04,630 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:20:04,636 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:20:04,638 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:20:04,638 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:20:04,639 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2020-07-21 20:20:04,749 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4644f2aba/f55ecf31543b49acb8718099df28f370/FLAGafa8ee0b8 [2020-07-21 20:20:05,309 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:20:05,310 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i [2020-07-21 20:20:05,319 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4644f2aba/f55ecf31543b49acb8718099df28f370/FLAGafa8ee0b8 [2020-07-21 20:20:05,704 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4644f2aba/f55ecf31543b49acb8718099df28f370 [2020-07-21 20:20:05,718 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:20:05,722 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:20:05,727 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:20:05,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:20:05,731 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:20:05,732 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:20:05" (1/1) ... [2020-07-21 20:20:05,735 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656f4b77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:05, skipping insertion in model container [2020-07-21 20:20:05,735 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:20:05" (1/1) ... [2020-07-21 20:20:05,742 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:20:05,759 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:20:05,978 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:20:05,986 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:20:06,008 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:20:06,025 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:20:06,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06 WrapperNode [2020-07-21 20:20:06,026 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:20:06,028 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:20:06,028 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:20:06,028 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:20:06,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,041 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,047 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,051 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,058 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (1/1) ... [2020-07-21 20:20:06,161 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:20:06,162 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:20:06,163 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:20:06,163 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:20:06,164 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (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 20:20:06,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:20:06,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:20:06,234 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:20:06,234 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:20:06,234 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:20:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:20:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 20:20:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:20:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:20:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:20:06,428 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:20:06,428 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 20:20:06,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:20:06 BoogieIcfgContainer [2020-07-21 20:20:06,433 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:20:06,435 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:20:06,435 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:20:06,440 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:20:06,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:20:05" (1/3) ... [2020-07-21 20:20:06,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73134e09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:20:06, skipping insertion in model container [2020-07-21 20:20:06,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:06" (2/3) ... [2020-07-21 20:20:06,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73134e09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:20:06, skipping insertion in model container [2020-07-21 20:20:06,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:20:06" (3/3) ... [2020-07-21 20:20:06,445 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2020-07-21 20:20:06,457 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:20:06,467 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:20:06,487 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:20:06,528 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:20:06,528 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:20:06,529 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:20:06,529 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:20:06,529 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:20:06,530 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:20:06,530 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:20:06,530 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:20:06,555 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-21 20:20:06,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 20:20:06,565 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:06,567 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:06,567 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:06,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:06,575 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-07-21 20:20:06,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:06,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804618991] [2020-07-21 20:20:06,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 20:20:06,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:06,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:06,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:20:06,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:06,820 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 20:20:06,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:20:06,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804618991] [2020-07-21 20:20:06,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:20:06,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:20:06,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377172162] [2020-07-21 20:20:06,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:20:06,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:06,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:20:06,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:20:06,849 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 5 states. [2020-07-21 20:20:06,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:06,969 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2020-07-21 20:20:06,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:20:06,972 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-07-21 20:20:06,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:06,981 INFO L225 Difference]: With dead ends: 40 [2020-07-21 20:20:06,982 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 20:20:06,987 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 20:20:07,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 20:20:07,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 20:20:07,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 20:20:07,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-07-21 20:20:07,045 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2020-07-21 20:20:07,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:07,047 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-07-21 20:20:07,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:20:07,048 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-07-21 20:20:07,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 20:20:07,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:07,050 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:07,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:07,265 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:07,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:07,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2020-07-21 20:20:07,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:07,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345925992] [2020-07-21 20:20:07,268 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 20:20:07,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:07,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:07,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 20:20:07,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:07,436 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:20:07,483 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 20:20:07,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:07,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:20:07,702 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 20:20:07,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345925992] [2020-07-21 20:20:07,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:07,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 20:20:07,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824664517] [2020-07-21 20:20:07,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 20:20:07,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:07,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 20:20:07,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:20:07,709 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 14 states. [2020-07-21 20:20:08,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:08,085 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-07-21 20:20:08,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 20:20:08,086 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 13 [2020-07-21 20:20:08,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:08,088 INFO L225 Difference]: With dead ends: 36 [2020-07-21 20:20:08,088 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 20:20:08,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2020-07-21 20:20:08,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 20:20:08,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-07-21 20:20:08,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 20:20:08,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-21 20:20:08,097 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2020-07-21 20:20:08,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:08,098 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-21 20:20:08,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 20:20:08,098 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-21 20:20:08,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 20:20:08,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:08,100 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:08,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:08,315 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:08,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:08,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1350121109, now seen corresponding path program 1 times [2020-07-21 20:20:08,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:08,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111317971] [2020-07-21 20:20:08,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 20:20:08,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:08,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:08,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 20:20:08,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:08,388 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:08,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:08,439 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:08,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111317971] [2020-07-21 20:20:08,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:08,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 20:20:08,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285162133] [2020-07-21 20:20:08,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:20:08,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:08,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:20:08,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:20:08,442 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 8 states. [2020-07-21 20:20:08,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:08,508 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-21 20:20:08,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:20:08,509 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-21 20:20:08,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:08,513 INFO L225 Difference]: With dead ends: 42 [2020-07-21 20:20:08,513 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 20:20:08,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 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 20:20:08,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 20:20:08,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 20:20:08,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 20:20:08,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 20:20:08,524 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 19 [2020-07-21 20:20:08,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:08,525 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 20:20:08,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:20:08,525 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 20:20:08,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 20:20:08,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:08,526 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:08,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:08,742 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:08,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:08,743 INFO L82 PathProgramCache]: Analyzing trace with hash -424886253, now seen corresponding path program 2 times [2020-07-21 20:20:08,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:08,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618700676] [2020-07-21 20:20:08,744 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 20:20:08,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:08,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:08,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 20:20:08,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:08,963 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:20:09,003 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:09,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:09,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:20:09,437 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:09,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618700676] [2020-07-21 20:20:09,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:09,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 20:20:09,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394044801] [2020-07-21 20:20:09,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 20:20:09,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:09,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 20:20:09,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2020-07-21 20:20:09,440 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 22 states. [2020-07-21 20:20:10,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:10,413 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-07-21 20:20:10,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 20:20:10,413 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-21 20:20:10,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:10,414 INFO L225 Difference]: With dead ends: 41 [2020-07-21 20:20:10,415 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 20:20:10,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=202, Invalid=1058, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 20:20:10,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 20:20:10,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-07-21 20:20:10,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 20:20:10,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-07-21 20:20:10,423 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 19 [2020-07-21 20:20:10,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:10,423 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-07-21 20:20:10,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 20:20:10,423 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-07-21 20:20:10,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 20:20:10,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:10,424 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:10,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:10,637 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:10,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:10,639 INFO L82 PathProgramCache]: Analyzing trace with hash 98169237, now seen corresponding path program 2 times [2020-07-21 20:20:10,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:10,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977890232] [2020-07-21 20:20:10,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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) [2020-07-21 20:20:10,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:10,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:10,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 20:20:10,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:10,733 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:10,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:10,803 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:10,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977890232] [2020-07-21 20:20:10,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:10,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2020-07-21 20:20:10,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773339370] [2020-07-21 20:20:10,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 20:20:10,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:10,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 20:20:10,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-07-21 20:20:10,807 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 11 states. [2020-07-21 20:20:10,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:10,893 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-21 20:20:10,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 20:20:10,894 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-07-21 20:20:10,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:10,895 INFO L225 Difference]: With dead ends: 51 [2020-07-21 20:20:10,896 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 20:20:10,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-07-21 20:20:10,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 20:20:10,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-07-21 20:20:10,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 20:20:10,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-07-21 20:20:10,904 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 31 [2020-07-21 20:20:10,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:10,905 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-07-21 20:20:10,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 20:20:10,905 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-07-21 20:20:10,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 20:20:10,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:10,906 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:11,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:11,122 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:11,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:11,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1032151993, now seen corresponding path program 3 times [2020-07-21 20:20:11,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:11,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324715355] [2020-07-21 20:20:11,124 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 20:20:11,160 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:11,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 20:20:11,161 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 20:20:11,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 20:20:11,174 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 20:20:11,195 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 20:20:11,195 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 20:20:11,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:11,443 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 08:20:11 BoogieIcfgContainer [2020-07-21 20:20:11,443 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 20:20:11,447 INFO L168 Benchmark]: Toolchain (without parser) took 5724.92 ms. Allocated memory was 144.7 MB in the beginning and 248.0 MB in the end (delta: 103.3 MB). Free memory was 102.4 MB in the beginning and 100.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 104.8 MB. Max. memory is 7.1 GB. [2020-07-21 20:20:11,448 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 144.7 MB. Free memory is still 120.5 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 20:20:11,448 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.97 ms. Allocated memory is still 144.7 MB. Free memory was 102.0 MB in the beginning and 92.8 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-07-21 20:20:11,449 INFO L168 Benchmark]: Boogie Preprocessor took 133.35 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 92.8 MB in the beginning and 182.0 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-21 20:20:11,450 INFO L168 Benchmark]: RCFGBuilder took 270.76 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 169.4 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2020-07-21 20:20:11,452 INFO L168 Benchmark]: TraceAbstraction took 5008.13 ms. Allocated memory was 202.4 MB in the beginning and 248.0 MB in the end (delta: 45.6 MB). Free memory was 168.5 MB in the beginning and 100.9 MB in the end (delta: 67.6 MB). Peak memory consumption was 113.2 MB. Max. memory is 7.1 GB. [2020-07-21 20:20:11,455 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 144.7 MB. Free memory is still 120.5 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 299.97 ms. Allocated memory is still 144.7 MB. Free memory was 102.0 MB in the beginning and 92.8 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 133.35 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 92.8 MB in the beginning and 182.0 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 270.76 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 169.4 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5008.13 ms. Allocated memory was 202.4 MB in the beginning and 248.0 MB in the end (delta: 45.6 MB). Free memory was 168.5 MB in the beginning and 100.9 MB in the end (delta: 67.6 MB). Peak memory consumption was 113.2 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, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, n=10, n=0] [L13] COND TRUE i<=n VAL [i=1, n=0, n=10] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=1, n=10, n=2] [L13] i++ VAL [i=2, n=10, n=2] [L13] COND TRUE i<=n VAL [i=2, n=2, n=10] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=2, n=10, n=4] [L13] i++ VAL [i=3, n=10, n=4] [L13] COND TRUE i<=n VAL [i=3, n=10, n=4] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=3, n=6, n=10] [L13] i++ VAL [i=4, n=10, n=6] [L13] COND TRUE i<=n VAL [i=4, n=6, n=10] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=4, n=8, n=10] [L13] i++ VAL [i=5, n=10, n=8] [L13] COND TRUE i<=n VAL [i=5, n=10, n=8] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=5, n=10, n=10] [L13] i++ VAL [i=6, n=10, n=10] [L13] COND TRUE i<=n VAL [i=6, n=10, n=10] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=6, n=12, n=10] [L13] i++ VAL [i=7, n=10, n=12] [L13] COND TRUE i<=n VAL [i=7, n=12, n=10] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=7, n=10, n=14] [L13] i++ VAL [i=8, n=10, n=14] [L13] COND TRUE i<=n VAL [i=8, n=10, n=14] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=8, n=16, n=10] [L13] i++ VAL [i=9, n=10, n=16] [L13] COND TRUE i<=n VAL [i=9, n=10, n=16] [L14] COND TRUE i<10 [L15] sn = sn + (2) VAL [i=9, n=10, n=18] [L13] i++ VAL [i=10, n=18, n=10] [L13] COND TRUE i<=n VAL [i=10, n=18, n=10] [L14] COND FALSE !(i<10) VAL [i=10, n=18, n=10] [L13] i++ VAL [i=11, n=18, n=10] [L13] COND FALSE !(i<=n) VAL [i=11, n=18, n=10] [L17] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) 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, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.8s, OverallIterations: 6, TraceHistogramMax: 10, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 54 SDtfs, 70 SDslu, 215 SDs, 0 SdLazy, 343 SolverSat, 34 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 188 GetRequests, 110 SyntacticMatches, 9 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 2.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=5, 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, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 132 NumberOfCodeBlocks, 103 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 165 ConstructedInterpolants, 0 QuantifiedInterpolants, 13155 SizeOfPredicates, 12 NumberOfNonLiveVariables, 167 ConjunctsInSsa, 49 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 36/190 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...