/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --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/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:44:13,952 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:44:13,955 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:44:13,970 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:44:13,971 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:44:13,972 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:44:13,974 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:44:13,977 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:44:13,979 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:44:13,980 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:44:13,982 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:44:13,983 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:44:13,983 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:44:13,985 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:44:13,987 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:44:13,988 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:44:13,989 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:44:13,991 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:44:13,993 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:44:13,996 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:44:13,998 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:44:14,000 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:44:14,001 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:44:14,002 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:44:14,009 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:44:14,019 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:44:14,021 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:44:14,022 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:44:14,023 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 16:44:14,038 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:44:14,039 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:44:14,040 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:44:14,040 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:44:14,040 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:44:14,041 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:44:14,041 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:44:14,041 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:44:14,041 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:44:14,041 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:44:14,042 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:44:14,042 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:44:14,042 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:44:14,042 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:44:14,043 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:44:14,043 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:44:14,043 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:44:14,043 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:44:14,044 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:44:14,044 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:44:14,044 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:44:14,044 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:44:14,044 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:44:14,045 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:44:14,045 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:44:14,045 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:44:14,045 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:14,045 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:44:14,046 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:44:14,046 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES 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 16:44:14,386 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:44:14,410 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:44:14,414 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:44:14,415 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:44:14,416 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:44:14,417 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2020-07-21 16:44:14,512 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a6999ac2/f4ee767cde4043e296d36ba1964c453a/FLAGbd83652c0 [2020-07-21 16:44:15,101 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:44:15,102 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i [2020-07-21 16:44:15,110 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a6999ac2/f4ee767cde4043e296d36ba1964c453a/FLAGbd83652c0 [2020-07-21 16:44:15,509 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a6999ac2/f4ee767cde4043e296d36ba1964c453a [2020-07-21 16:44:15,524 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:44:15,528 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:44:15,529 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:44:15,529 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:44:15,534 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:44:15,535 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,538 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@776eb569 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15, skipping insertion in model container [2020-07-21 16:44:15,539 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,548 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:44:15,569 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:44:15,751 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:44:15,756 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:44:15,775 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:44:15,793 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:44:15,793 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15 WrapperNode [2020-07-21 16:44:15,794 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:44:15,795 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:44:15,795 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:44:15,795 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:44:15,811 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,817 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,818 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,823 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,829 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,830 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (1/1) ... [2020-07-21 16:44:15,926 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:44:15,927 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:44:15,927 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:44:15,927 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:44:15,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (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 16:44:16,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:44:16,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:44:16,013 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:44:16,014 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:44:16,014 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:44:16,014 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:44:16,014 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:44:16,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:44:16,015 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:44:16,204 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:44:16,204 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:44:16,208 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:44:16 BoogieIcfgContainer [2020-07-21 16:44:16,209 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:44:16,210 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:44:16,210 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:44:16,214 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:44:16,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:44:15" (1/3) ... [2020-07-21 16:44:16,216 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15b0b3ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:44:16, skipping insertion in model container [2020-07-21 16:44:16,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:15" (2/3) ... [2020-07-21 16:44:16,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15b0b3ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:44:16, skipping insertion in model container [2020-07-21 16:44:16,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:44:16" (3/3) ... [2020-07-21 16:44:16,219 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2020-07-21 16:44:16,230 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:44:16,238 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:44:16,256 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:44:16,289 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:44:16,289 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:44:16,289 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:44:16,289 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:44:16,291 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:44:16,291 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:44:16,291 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:44:16,291 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:44:16,312 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-21 16:44:16,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 16:44:16,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:16,319 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:16,320 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:16,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:16,326 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-07-21 16:44:16,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:16,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981120261] [2020-07-21 16:44:16,334 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 16:44:16,406 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:16,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:16,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:44:16,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:16,449 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 16:44:16,450 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:44:16,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981120261] [2020-07-21 16:44:16,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:44:16,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:44:16,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128944483] [2020-07-21 16:44:16,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:44:16,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:16,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:44:16,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:44:16,493 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-07-21 16:44:16,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:16,530 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-07-21 16:44:16,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:44:16,533 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 16:44:16,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:16,546 INFO L225 Difference]: With dead ends: 30 [2020-07-21 16:44:16,547 INFO L226 Difference]: Without dead ends: 13 [2020-07-21 16:44:16,552 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 16:44:16,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-07-21 16:44:16,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-07-21 16:44:16,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-21 16:44:16,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-07-21 16:44:16,602 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-07-21 16:44:16,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:16,603 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-07-21 16:44:16,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:44:16,604 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-07-21 16:44:16,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 16:44:16,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:16,605 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:16,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:16,821 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:16,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:16,822 INFO L82 PathProgramCache]: Analyzing trace with hash -731660105, now seen corresponding path program 1 times [2020-07-21 16:44:16,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:16,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386707574] [2020-07-21 16:44:16,824 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 16:44:16,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:16,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:16,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:44:16,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:16,889 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 16:44:16,889 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:44:16,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386707574] [2020-07-21 16:44:16,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:44:16,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:44:16,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009791432] [2020-07-21 16:44:16,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:44:16,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:16,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:44:16,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:44:16,894 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2020-07-21 16:44:16,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:16,933 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2020-07-21 16:44:16,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:44:16,934 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 16:44:16,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:16,935 INFO L225 Difference]: With dead ends: 24 [2020-07-21 16:44:16,936 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 16:44:16,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 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 16:44:16,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 16:44:16,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-07-21 16:44:16,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 16:44:16,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-07-21 16:44:16,945 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2020-07-21 16:44:16,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:16,945 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-07-21 16:44:16,946 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:44:16,946 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-07-21 16:44:16,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:44:16,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:16,947 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:17,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:17,164 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:17,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:17,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2020-07-21 16:44:17,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:17,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842648256] [2020-07-21 16:44:17,167 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 16:44:17,206 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:17,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:17,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:44:17,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:17,257 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 16:44:17,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:17,302 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 16:44:17,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842648256] [2020-07-21 16:44:17,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:17,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 16:44:17,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275079947] [2020-07-21 16:44:17,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:44:17,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:17,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:44:17,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:44:17,306 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 6 states. [2020-07-21 16:44:17,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:17,381 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2020-07-21 16:44:17,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:44:17,382 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-07-21 16:44:17,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:17,383 INFO L225 Difference]: With dead ends: 31 [2020-07-21 16:44:17,383 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 16:44:17,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:44:17,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 16:44:17,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 16:44:17,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 16:44:17,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-07-21 16:44:17,392 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 13 [2020-07-21 16:44:17,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:17,392 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-07-21 16:44:17,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:44:17,393 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-07-21 16:44:17,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:44:17,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:17,394 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:17,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:17,595 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:17,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:17,597 INFO L82 PathProgramCache]: Analyzing trace with hash -845939081, now seen corresponding path program 1 times [2020-07-21 16:44:17,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:17,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70177023] [2020-07-21 16:44:17,599 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 16:44:17,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:17,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:17,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:44:17,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:17,683 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:44:17,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:17,730 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:44:17,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70177023] [2020-07-21 16:44:17,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:17,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2020-07-21 16:44:17,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245928314] [2020-07-21 16:44:17,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:44:17,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:17,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:44:17,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:44:17,735 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 5 states. [2020-07-21 16:44:17,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:17,779 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-07-21 16:44:17,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:44:17,780 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2020-07-21 16:44:17,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:17,781 INFO L225 Difference]: With dead ends: 33 [2020-07-21 16:44:17,781 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 16:44:17,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:44:17,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 16:44:17,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 16:44:17,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 16:44:17,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-07-21 16:44:17,788 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 22 [2020-07-21 16:44:17,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:17,788 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-07-21 16:44:17,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:44:17,788 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-07-21 16:44:17,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:44:17,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:17,789 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:17,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:17,991 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:17,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:17,991 INFO L82 PathProgramCache]: Analyzing trace with hash -452912071, now seen corresponding path program 2 times [2020-07-21 16:44:17,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:17,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359766799] [2020-07-21 16:44:17,993 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) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:18,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:18,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:18,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:44:18,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:18,100 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:18,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:18,190 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:18,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359766799] [2020-07-21 16:44:18,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:18,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:44:18,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54880381] [2020-07-21 16:44:18,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:44:18,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:18,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:44:18,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:44:18,194 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 10 states. [2020-07-21 16:44:18,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:18,336 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2020-07-21 16:44:18,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:44:18,338 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2020-07-21 16:44:18,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:18,345 INFO L225 Difference]: With dead ends: 40 [2020-07-21 16:44:18,345 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 16:44:18,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:44:18,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 16:44:18,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 16:44:18,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:44:18,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-07-21 16:44:18,355 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 22 [2020-07-21 16:44:18,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:18,356 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-07-21 16:44:18,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:44:18,356 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-07-21 16:44:18,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 16:44:18,357 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:18,357 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:18,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:18,562 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:18,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:18,562 INFO L82 PathProgramCache]: Analyzing trace with hash 749989817, now seen corresponding path program 3 times [2020-07-21 16:44:18,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:18,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633134109] [2020-07-21 16:44:18,564 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 16:44:18,605 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:18,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:44:18,606 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:44:18,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:44:18,626 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:44:18,669 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:44:18,670 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:44:18,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:18,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:44:18 BoogieIcfgContainer [2020-07-21 16:44:18,914 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:44:18,917 INFO L168 Benchmark]: Toolchain (without parser) took 3390.09 ms. Allocated memory was 134.7 MB in the beginning and 225.4 MB in the end (delta: 90.7 MB). Free memory was 99.9 MB in the beginning and 185.5 MB in the end (delta: -85.6 MB). Peak memory consumption was 5.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:18,918 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 134.7 MB. Free memory was 117.8 MB in the beginning and 117.6 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:44:18,919 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.15 ms. Allocated memory is still 134.7 MB. Free memory was 99.4 MB in the beginning and 90.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:18,920 INFO L168 Benchmark]: Boogie Preprocessor took 131.65 ms. Allocated memory was 134.7 MB in the beginning and 199.2 MB in the end (delta: 64.5 MB). Free memory was 90.1 MB in the beginning and 179.3 MB in the end (delta: -89.1 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:18,922 INFO L168 Benchmark]: RCFGBuilder took 281.98 ms. Allocated memory is still 199.2 MB. Free memory was 179.3 MB in the beginning and 166.9 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:18,923 INFO L168 Benchmark]: TraceAbstraction took 2703.91 ms. Allocated memory was 199.2 MB in the beginning and 225.4 MB in the end (delta: 26.2 MB). Free memory was 166.9 MB in the beginning and 185.5 MB in the end (delta: -18.6 MB). Peak memory consumption was 7.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:18,927 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 134.7 MB. Free memory was 117.8 MB in the beginning and 117.6 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.15 ms. Allocated memory is still 134.7 MB. Free memory was 99.4 MB in the beginning and 90.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 131.65 ms. Allocated memory was 134.7 MB in the beginning and 199.2 MB in the end (delta: 64.5 MB). Free memory was 90.1 MB in the beginning and 179.3 MB in the end (delta: -89.1 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 281.98 ms. Allocated memory is still 199.2 MB. Free memory was 179.3 MB in the beginning and 166.9 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2703.91 ms. Allocated memory was 199.2 MB in the beginning and 225.4 MB in the end (delta: 26.2 MB). Free memory was 166.9 MB in the beginning and 185.5 MB in the end (delta: -18.6 MB). Peak memory consumption was 7.6 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, sn=0; [L13] i=1 VAL [i=1, sn=0] [L13] COND TRUE i<=8 VAL [i=1, sn=0] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=1, sn=2] [L13] i++ VAL [i=2, sn=2] [L13] COND TRUE i<=8 VAL [i=2, sn=2] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=2, sn=4] [L13] i++ VAL [i=3, sn=4] [L13] COND TRUE i<=8 VAL [i=3, sn=4] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=3, sn=6] [L13] i++ VAL [i=4, sn=6] [L13] COND TRUE i<=8 VAL [i=4, sn=6] [L14] COND FALSE !(i<4) VAL [i=4, sn=6] [L13] i++ VAL [i=5, sn=6] [L13] COND TRUE i<=8 VAL [i=5, sn=6] [L14] COND FALSE !(i<4) VAL [i=5, sn=6] [L13] i++ VAL [i=6, sn=6] [L13] COND TRUE i<=8 VAL [i=6, sn=6] [L14] COND FALSE !(i<4) VAL [i=6, sn=6] [L13] i++ VAL [i=7, sn=6] [L13] COND TRUE i<=8 VAL [i=7, sn=6] [L14] COND FALSE !(i<4) VAL [i=7, sn=6] [L13] i++ VAL [i=8, sn=6] [L13] COND TRUE i<=8 VAL [i=8, sn=6] [L14] COND FALSE !(i<4) VAL [i=8, sn=6] [L13] i++ VAL [i=9, sn=6] [L13] COND FALSE !(i<=8) VAL [i=9, sn=6] [L17] CALL __VERIFIER_assert(sn==8*(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: 2.6s, OverallIterations: 6, TraceHistogramMax: 8, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 62 SDtfs, 35 SDslu, 64 SDs, 0 SdLazy, 69 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 129 GetRequests, 108 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred 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, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 111 NumberOfCodeBlocks, 111 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 126 ConstructedInterpolants, 0 QuantifiedInterpolants, 4188 SizeOfPredicates, 4 NumberOfNonLiveVariables, 168 ConjunctsInSsa, 16 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 30/90 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...