/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:40:29,678 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:40:29,682 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:40:29,698 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:40:29,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:40:29,701 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:40:29,703 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:40:29,713 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:40:29,716 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:40:29,720 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:40:29,721 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:40:29,723 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:40:29,723 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:40:29,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:40:29,727 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:40:29,728 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:40:29,729 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:40:29,730 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:40:29,731 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:40:29,736 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:40:29,740 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:40:29,744 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:40:29,745 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:40:29,745 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:40:29,748 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:40:29,756 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:40:29,757 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:40:29,758 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:40:29,759 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 10:40:29,784 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:40:29,784 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:40:29,785 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:40:29,786 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:40:29,786 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:40:29,786 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:40:29,786 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:40:29,787 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:40:29,787 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:40:29,787 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:40:29,788 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:40:29,788 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:40:29,788 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:40:29,789 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:40:29,789 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:40:29,789 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:40:29,789 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:40:29,790 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:40:29,790 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:40:29,790 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:40:29,790 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:40:29,790 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:40:29,790 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:40:29,791 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:40:29,791 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:40:29,791 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:40:29,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:29,791 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:40:29,792 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:40:29,792 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 10:40:30,091 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:40:30,104 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:40:30,107 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:40:30,108 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:40:30,108 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:40:30,109 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-07-21 10:40:30,165 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/440525655/1e41e9d2704f4bbc8417ffada98e006a/FLAGef8fe4357 [2020-07-21 10:40:30,570 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:40:30,570 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-07-21 10:40:30,577 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/440525655/1e41e9d2704f4bbc8417ffada98e006a/FLAGef8fe4357 [2020-07-21 10:40:30,995 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/440525655/1e41e9d2704f4bbc8417ffada98e006a [2020-07-21 10:40:31,004 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:40:31,007 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:40:31,008 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:40:31,009 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:40:31,012 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:40:31,013 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:40:30" (1/1) ... [2020-07-21 10:40:31,016 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@316a3cec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31, skipping insertion in model container [2020-07-21 10:40:31,016 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:40:30" (1/1) ... [2020-07-21 10:40:31,024 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:40:31,043 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:40:31,215 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:40:31,219 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:40:31,236 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:40:31,250 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:40:31,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31 WrapperNode [2020-07-21 10:40:31,251 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:40:31,252 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:40:31,252 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:40:31,252 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:40:31,266 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,266 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,271 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,271 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,275 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,277 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,278 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,280 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:40:31,280 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:40:31,280 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:40:31,280 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:40:31,281 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (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 10:40:31,442 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:40:31,442 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:40:31,442 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-21 10:40:31,442 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:40:31,443 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:40:31,443 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:40:31,443 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-21 10:40:31,443 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:40:31,443 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:40:31,443 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:40:31,646 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:40:31,647 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:40:31,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:40:31 BoogieIcfgContainer [2020-07-21 10:40:31,650 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:40:31,652 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:40:31,652 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:40:31,655 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:40:31,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:40:30" (1/3) ... [2020-07-21 10:40:31,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@337a9541 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:40:31, skipping insertion in model container [2020-07-21 10:40:31,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (2/3) ... [2020-07-21 10:40:31,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@337a9541 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:40:31, skipping insertion in model container [2020-07-21 10:40:31,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:40:31" (3/3) ... [2020-07-21 10:40:31,659 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-07-21 10:40:31,673 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:40:31,680 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:40:31,695 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:40:31,723 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:40:31,724 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:40:31,724 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:40:31,724 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:40:31,725 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:40:31,725 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:40:31,725 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:40:31,725 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:40:31,753 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 10:40:31,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 10:40:31,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:31,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:31,762 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:31,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:31,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-21 10:40:31,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:31,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531377517] [2020-07-21 10:40:31,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:31,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:31,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 10:40:31,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:31,977 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 10:40:31,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:31,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531377517] [2020-07-21 10:40:31,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:31,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 10:40:31,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792555232] [2020-07-21 10:40:31,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 10:40:31,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:31,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 10:40:31,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 10:40:32,001 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-07-21 10:40:32,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:32,210 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-07-21 10:40:32,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:40:32,212 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-07-21 10:40:32,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:32,224 INFO L225 Difference]: With dead ends: 41 [2020-07-21 10:40:32,225 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 10:40:32,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:40:32,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 10:40:32,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-21 10:40:32,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 10:40:32,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-07-21 10:40:32,273 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-07-21 10:40:32,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:32,273 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-07-21 10:40:32,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 10:40:32,274 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-07-21 10:40:32,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 10:40:32,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:32,277 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:32,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:32,488 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:32,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:32,489 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-21 10:40:32,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:32,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331223490] [2020-07-21 10:40:32,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:32,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:32,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:40:32,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:32,616 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:40:32,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:32,874 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:40:32,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331223490] [2020-07-21 10:40:32,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:40:32,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2020-07-21 10:40:32,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090778589] [2020-07-21 10:40:32,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 10:40:32,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:32,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 10:40:32,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:40:32,880 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-07-21 10:40:33,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:33,045 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-07-21 10:40:33,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:40:33,046 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-21 10:40:33,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:33,048 INFO L225 Difference]: With dead ends: 32 [2020-07-21 10:40:33,048 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:40:33,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:40:33,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:40:33,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 10:40:33,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:40:33,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-07-21 10:40:33,058 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-07-21 10:40:33,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:33,059 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-07-21 10:40:33,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 10:40:33,059 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-07-21 10:40:33,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 10:40:33,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:33,061 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:33,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:33,275 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:33,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:33,276 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-07-21 10:40:33,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:33,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527377953] [2020-07-21 10:40:33,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:33,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:33,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:40:33,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:33,358 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:40:33,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:33,509 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:40:33,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527377953] [2020-07-21 10:40:33,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:33,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 10:40:33,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139911046] [2020-07-21 10:40:33,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:40:33,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:33,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:40:33,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:40:33,512 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 9 states. [2020-07-21 10:40:33,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:33,652 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-07-21 10:40:33,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:40:33,653 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-07-21 10:40:33,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:33,654 INFO L225 Difference]: With dead ends: 53 [2020-07-21 10:40:33,655 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:40:33,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:40:33,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:40:33,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 10:40:33,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 10:40:33,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-07-21 10:40:33,665 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-07-21 10:40:33,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:33,665 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-07-21 10:40:33,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:40:33,666 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-07-21 10:40:33,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 10:40:33,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:33,668 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:33,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:33,883 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:33,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:33,884 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-07-21 10:40:33,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:33,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605976296] [2020-07-21 10:40:33,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:33,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:33,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:40:33,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:34,024 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 10:40:34,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:34,675 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 10:40:34,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605976296] [2020-07-21 10:40:34,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:34,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13] total 22 [2020-07-21 10:40:34,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870381609] [2020-07-21 10:40:34,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 10:40:34,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:34,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 10:40:34,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2020-07-21 10:40:34,679 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 22 states. [2020-07-21 10:40:35,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:35,246 INFO L93 Difference]: Finished difference Result 56 states and 88 transitions. [2020-07-21 10:40:35,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 10:40:35,247 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 35 [2020-07-21 10:40:35,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:35,255 INFO L225 Difference]: With dead ends: 56 [2020-07-21 10:40:35,255 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 10:40:35,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=222, Invalid=1184, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:40:35,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 10:40:35,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2020-07-21 10:40:35,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:40:35,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 67 transitions. [2020-07-21 10:40:35,275 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 67 transitions. Word has length 35 [2020-07-21 10:40:35,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:35,275 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 67 transitions. [2020-07-21 10:40:35,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 10:40:35,276 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 67 transitions. [2020-07-21 10:40:35,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 10:40:35,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:35,278 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:35,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:35,493 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:35,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:35,494 INFO L82 PathProgramCache]: Analyzing trace with hash -692340191, now seen corresponding path program 2 times [2020-07-21 10:40:35,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:35,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525773816] [2020-07-21 10:40:35,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:35,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:35,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 10:40:35,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:35,586 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 31 proven. 13 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 10:40:35,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:36,038 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 36 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 10:40:36,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525773816] [2020-07-21 10:40:36,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:36,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2020-07-21 10:40:36,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204544435] [2020-07-21 10:40:36,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 10:40:36,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:36,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 10:40:36,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:40:36,042 INFO L87 Difference]: Start difference. First operand 41 states and 67 transitions. Second operand 14 states. [2020-07-21 10:40:36,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:36,235 INFO L93 Difference]: Finished difference Result 84 states and 183 transitions. [2020-07-21 10:40:36,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:40:36,237 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2020-07-21 10:40:36,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:36,239 INFO L225 Difference]: With dead ends: 84 [2020-07-21 10:40:36,239 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 10:40:36,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 84 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:40:36,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 10:40:36,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-07-21 10:40:36,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 10:40:36,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 83 transitions. [2020-07-21 10:40:36,257 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 83 transitions. Word has length 49 [2020-07-21 10:40:36,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:36,258 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 83 transitions. [2020-07-21 10:40:36,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 10:40:36,258 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 83 transitions. [2020-07-21 10:40:36,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 10:40:36,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:36,262 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:36,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:36,476 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:36,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:36,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1882326077, now seen corresponding path program 3 times [2020-07-21 10:40:36,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:36,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907071672] [2020-07-21 10:40:36,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:36,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:36,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 10:40:36,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:36,580 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 60 proven. 63 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2020-07-21 10:40:36,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:36,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:36,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:36,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:37,017 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 60 proven. 70 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 10:40:37,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907071672] [2020-07-21 10:40:37,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:37,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8] total 9 [2020-07-21 10:40:37,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327623789] [2020-07-21 10:40:37,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:40:37,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:37,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:40:37,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:40:37,022 INFO L87 Difference]: Start difference. First operand 48 states and 83 transitions. Second operand 9 states. [2020-07-21 10:40:37,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:37,166 INFO L93 Difference]: Finished difference Result 122 states and 312 transitions. [2020-07-21 10:40:37,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:40:37,169 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 82 [2020-07-21 10:40:37,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:37,177 INFO L225 Difference]: With dead ends: 122 [2020-07-21 10:40:37,178 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 10:40:37,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 150 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=78, Unknown=0, NotChecked=0, Total=132 [2020-07-21 10:40:37,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 10:40:37,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-07-21 10:40:37,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-21 10:40:37,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 154 transitions. [2020-07-21 10:40:37,207 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 154 transitions. Word has length 82 [2020-07-21 10:40:37,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:37,208 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 154 transitions. [2020-07-21 10:40:37,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:40:37,208 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 154 transitions. [2020-07-21 10:40:37,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 10:40:37,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:37,212 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:37,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:37,426 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:37,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:37,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1731624099, now seen corresponding path program 4 times [2020-07-21 10:40:37,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:37,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588817468] [2020-07-21 10:40:37,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:37,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:37,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:40:37,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:37,579 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 79 proven. 89 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2020-07-21 10:40:37,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:38,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:38,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:38,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:38,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:38,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:40:38,703 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 79 proven. 93 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2020-07-21 10:40:38,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588817468] [2020-07-21 10:40:38,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:38,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 10:40:38,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328909083] [2020-07-21 10:40:38,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:40:38,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:38,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:40:38,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:40:38,708 INFO L87 Difference]: Start difference. First operand 69 states and 154 transitions. Second operand 13 states. [2020-07-21 10:40:38,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:38,966 INFO L93 Difference]: Finished difference Result 167 states and 527 transitions. [2020-07-21 10:40:38,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:40:38,971 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 82 [2020-07-21 10:40:38,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:38,975 INFO L225 Difference]: With dead ends: 167 [2020-07-21 10:40:38,976 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 10:40:38,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 141 SyntacticMatches, 13 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:40:38,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 10:40:39,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-07-21 10:40:39,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-21 10:40:39,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 254 transitions. [2020-07-21 10:40:39,007 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 254 transitions. Word has length 82 [2020-07-21 10:40:39,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:39,007 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 254 transitions. [2020-07-21 10:40:39,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:40:39,007 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 254 transitions. [2020-07-21 10:40:39,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 10:40:39,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:39,010 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:39,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:39,225 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:39,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:39,226 INFO L82 PathProgramCache]: Analyzing trace with hash -615976298, now seen corresponding path program 5 times [2020-07-21 10:40:39,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:39,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505321382] [2020-07-21 10:40:39,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:39,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:39,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 10:40:39,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:39,392 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 64 proven. 37 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 10:40:39,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:41,010 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 80 proven. 26 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 10:40:41,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505321382] [2020-07-21 10:40:41,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:41,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15] total 24 [2020-07-21 10:40:41,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371188168] [2020-07-21 10:40:41,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 10:40:41,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:41,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 10:40:41,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2020-07-21 10:40:41,013 INFO L87 Difference]: Start difference. First operand 106 states and 254 transitions. Second operand 24 states. [2020-07-21 10:40:41,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:41,323 INFO L93 Difference]: Finished difference Result 150 states and 380 transitions. [2020-07-21 10:40:41,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:40:41,324 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-07-21 10:40:41,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:41,325 INFO L225 Difference]: With dead ends: 150 [2020-07-21 10:40:41,325 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 10:40:41,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=217, Invalid=973, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:40:41,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 10:40:41,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 10:40:41,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 10:40:41,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 10:40:41,329 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2020-07-21 10:40:41,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:41,329 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 10:40:41,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 10:40:41,329 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 10:40:41,330 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 10:40:41,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:41,545 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 10:40:42,332 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 28 [2020-07-21 10:40:42,457 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 17 [2020-07-21 10:40:42,463 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 10:40:42,463 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 10:40:42,463 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 10:40:42,463 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 10:40:42,463 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 10:40:42,463 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 10:40:42,464 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-07-21 10:40:42,464 INFO L264 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (<= |ackermann_#in~m| ackermann_~m) (<= ackermann_~n |ackermann_#in~n|) (<= |ackermann_#in~n| ackermann_~n) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|)) (<= ackermann_~m |ackermann_#in~m|)) [2020-07-21 10:40:42,464 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-07-21 10:40:42,464 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-07-21 10:40:42,464 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (<= |ackermann_#in~m| ackermann_~m) (<= ackermann_~n |ackermann_#in~n|) (<= 0 |ackermann_#in~n|) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|)) (<= |ackermann_#in~n| ackermann_~n) (<= ackermann_~m |ackermann_#in~m|) (<= |ackermann_#in~n| 0)) [2020-07-21 10:40:42,464 INFO L264 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse0 (<= |ackermann_#in~m| ackermann_~m)) (.cse1 (<= |ackermann_#in~n| ackermann_~n))) (let ((.cse2 (and .cse0 (<= ackermann_~m 0) .cse1 (<= 0 |ackermann_#in~m|)))) (and (or (and .cse0 (<= ackermann_~n |ackermann_#in~n|) .cse1 (<= ackermann_~m |ackermann_#in~m|) (<= 1 |ackermann_#in~n|)) .cse2) (or (not (<= |ackermann_#in~m| 0)) .cse2) (or (<= 3 |ackermann_#t~ret1|) .cse2 (and (<= 2 |ackermann_#t~ret1|) (<= ackermann_~m 1)))))) [2020-07-21 10:40:42,465 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-07-21 10:40:42,465 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-21 10:40:42,465 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-07-21 10:40:42,465 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-07-21 10:40:42,465 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-07-21 10:40:42,465 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-07-21 10:40:42,466 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-07-21 10:40:42,466 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-07-21 10:40:42,466 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-07-21 10:40:42,466 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-07-21 10:40:42,466 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-07-21 10:40:42,466 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-07-21 10:40:42,466 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-07-21 10:40:42,467 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-07-21 10:40:42,467 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-07-21 10:40:42,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:40:42 BoogieIcfgContainer [2020-07-21 10:40:42,472 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 10:40:42,474 INFO L168 Benchmark]: Toolchain (without parser) took 11468.57 ms. Allocated memory was 145.2 MB in the beginning and 310.4 MB in the end (delta: 165.2 MB). Free memory was 102.8 MB in the beginning and 254.5 MB in the end (delta: -151.6 MB). Peak memory consumption was 174.0 MB. Max. memory is 7.1 GB. [2020-07-21 10:40:42,475 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 145.2 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 10:40:42,476 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.10 ms. Allocated memory is still 145.2 MB. Free memory was 102.4 MB in the beginning and 93.0 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-21 10:40:42,476 INFO L168 Benchmark]: Boogie Preprocessor took 28.03 ms. Allocated memory is still 145.2 MB. Free memory was 93.0 MB in the beginning and 91.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 10:40:42,477 INFO L168 Benchmark]: RCFGBuilder took 370.50 ms. Allocated memory was 145.2 MB in the beginning and 203.9 MB in the end (delta: 58.7 MB). Free memory was 91.6 MB in the beginning and 169.8 MB in the end (delta: -78.3 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 10:40:42,478 INFO L168 Benchmark]: TraceAbstraction took 10820.86 ms. Allocated memory was 203.9 MB in the beginning and 310.4 MB in the end (delta: 106.4 MB). Free memory was 169.8 MB in the beginning and 254.5 MB in the end (delta: -84.7 MB). Peak memory consumption was 182.3 MB. Max. memory is 7.1 GB. [2020-07-21 10:40:42,482 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 145.2 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.10 ms. Allocated memory is still 145.2 MB. Free memory was 102.4 MB in the beginning and 93.0 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.03 ms. Allocated memory is still 145.2 MB. Free memory was 93.0 MB in the beginning and 91.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 370.50 ms. Allocated memory was 145.2 MB in the beginning and 203.9 MB in the end (delta: 58.7 MB). Free memory was 91.6 MB in the beginning and 169.8 MB in the end (delta: -78.3 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10820.86 ms. Allocated memory was 203.9 MB in the beginning and 310.4 MB in the end (delta: 106.4 MB). Free memory was 169.8 MB in the beginning and 254.5 MB in the end (delta: -84.7 MB). Peak memory consumption was 182.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 44]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.8s, OverallIterations: 8, TraceHistogramMax: 11, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.9s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 179 SDtfs, 225 SDslu, 725 SDs, 0 SdLazy, 904 SolverSat, 283 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 802 GetRequests, 621 SyntacticMatches, 34 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=106occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 14 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 213 PreInvPairs, 382 NumberOfFragments, 129 HoareAnnotationTreeSize, 213 FomulaSimplifications, 2303 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 9 FomulaSimplificationsInter, 1533 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 5.3s InterpolantComputationTime, 382 NumberOfCodeBlocks, 382 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 734 ConstructedInterpolants, 0 QuantifiedInterpolants, 92642 SizeOfPredicates, 32 NumberOfNonLiveVariables, 1134 ConjunctsInSsa, 82 ConjunctsInUnsatCore, 15 InterpolantComputations, 2 PerfectInterpolantSequences, 1218/1636 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 correct! Received shutdown request...