/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --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 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-20 01:11:04,646 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 01:11:04,649 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 01:11:04,661 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 01:11:04,670 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 01:11:04,671 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 01:11:04,676 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 01:11:04,678 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 01:11:04,679 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 01:11:04,683 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 01:11:04,685 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 01:11:04,689 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 01:11:04,691 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 01:11:04,692 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 01:11:04,697 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 01:11:04,697 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 01:11:04,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 01:11:04,715 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 01:11:04,716 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 01:11:04,717 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 01:11:04,718 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 01:11:04,740 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 01:11:04,740 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 01:11:04,742 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 01:11:04,742 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 01:11:04,742 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 01:11:04,743 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 01:11:04,743 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 01:11:04,743 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 01:11:04,743 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 01:11:04,743 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 01:11:04,744 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 01:11:04,745 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 01:11:04,745 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 01:11:04,745 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 01:11:04,745 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 01:11:04,746 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 01:11:04,746 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 01:11:04,746 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 01:11:04,746 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 01:11:04,746 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 01:11:04,747 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 01:11:04,747 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 01:11:04,747 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 01:11:04,747 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 01:11:04,747 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 01:11:04,748 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 01:11:04,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 01:11:04,748 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 01:11:04,748 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 01:11:04,748 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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 -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-20 01:11:05,054 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 01:11:05,067 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 01:11:05,071 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 01:11:05,072 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 01:11:05,073 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 01:11:05,074 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-07-20 01:11:05,148 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac5748cb7/b31dbf27e5714f198869733118e52387/FLAGb285e46dc [2020-07-20 01:11:05,625 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 01:11:05,626 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-07-20 01:11:05,635 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac5748cb7/b31dbf27e5714f198869733118e52387/FLAGb285e46dc [2020-07-20 01:11:06,025 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac5748cb7/b31dbf27e5714f198869733118e52387 [2020-07-20 01:11:06,036 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 01:11:06,039 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 01:11:06,040 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 01:11:06,040 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 01:11:06,044 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 01:11:06,045 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,048 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@604cbeef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06, skipping insertion in model container [2020-07-20 01:11:06,048 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,057 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 01:11:06,077 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 01:11:06,246 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 01:11:06,252 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 01:11:06,267 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 01:11:06,281 INFO L208 MainTranslator]: Completed translation [2020-07-20 01:11:06,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06 WrapperNode [2020-07-20 01:11:06,281 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 01:11:06,282 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 01:11:06,282 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 01:11:06,282 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 01:11:06,292 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,382 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,382 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,386 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,389 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,390 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... [2020-07-20 01:11:06,392 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 01:11:06,393 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 01:11:06,393 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 01:11:06,393 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 01:11:06,394 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 01:11:06,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 01:11:06,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 01:11:06,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-20 01:11:06,466 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 01:11:06,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 01:11:06,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 01:11:06,466 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-20 01:11:06,467 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 01:11:06,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 01:11:06,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 01:11:06,664 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 01:11:06,664 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 01:11:06,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:11:06 BoogieIcfgContainer [2020-07-20 01:11:06,668 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 01:11:06,670 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 01:11:06,670 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 01:11:06,673 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 01:11:06,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:11:06" (1/3) ... [2020-07-20 01:11:06,674 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67944567 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:11:06, skipping insertion in model container [2020-07-20 01:11:06,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:06" (2/3) ... [2020-07-20 01:11:06,674 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67944567 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:11:06, skipping insertion in model container [2020-07-20 01:11:06,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:11:06" (3/3) ... [2020-07-20 01:11:06,676 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-07-20 01:11:06,686 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-20 01:11:06,702 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 01:11:06,720 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 01:11:06,749 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 01:11:06,749 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 01:11:06,749 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-20 01:11:06,749 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 01:11:06,750 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 01:11:06,750 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 01:11:06,750 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 01:11:06,750 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 01:11:06,776 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 01:11:06,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 01:11:06,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:06,786 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:11:06,786 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:06,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:06,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-20 01:11:06,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:06,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722773934] [2020-07-20 01:11:06,805 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:06,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:06,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:11:07,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722773934] [2020-07-20 01:11:07,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 01:11:07,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 01:11:07,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929041379] [2020-07-20 01:11:07,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 01:11:07,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:07,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 01:11:07,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 01:11:07,083 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-07-20 01:11:07,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:07,302 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-07-20 01:11:07,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 01:11:07,305 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-07-20 01:11:07,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:07,317 INFO L225 Difference]: With dead ends: 41 [2020-07-20 01:11:07,317 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 01:11:07,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-20 01:11:07,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 01:11:07,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-20 01:11:07,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 01:11:07,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-07-20 01:11:07,373 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-07-20 01:11:07,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:07,374 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-07-20 01:11:07,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 01:11:07,374 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-07-20 01:11:07,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 01:11:07,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:07,377 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] [2020-07-20 01:11:07,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-20 01:11:07,378 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:07,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:07,379 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-20 01:11:07,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:07,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365382109] [2020-07-20 01:11:07,380 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:07,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 01:11:07,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365382109] [2020-07-20 01:11:07,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 01:11:07,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 01:11:07,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772240141] [2020-07-20 01:11:07,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 01:11:07,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:07,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 01:11:07,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 01:11:07,564 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-07-20 01:11:07,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:07,738 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-07-20 01:11:07,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 01:11:07,739 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 01:11:07,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:07,741 INFO L225 Difference]: With dead ends: 32 [2020-07-20 01:11:07,741 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 01:11:07,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-07-20 01:11:07,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 01:11:07,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 01:11:07,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 01:11:07,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-07-20 01:11:07,752 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-07-20 01:11:07,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:07,753 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-07-20 01:11:07,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 01:11:07,753 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-07-20 01:11:07,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 01:11:07,755 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:07,755 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] [2020-07-20 01:11:07,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-20 01:11:07,756 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:07,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:07,756 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-07-20 01:11:07,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:07,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238278485] [2020-07-20 01:11:07,757 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:07,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:07,856 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 01:11:07,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238278485] [2020-07-20 01:11:07,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891043421] [2020-07-20 01:11:07,857 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@12522a4d No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:07,914 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@12522a4d issued 3 check-sat command(s) [2020-07-20 01:11:07,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:11:07,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 01:11:07,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:11:08,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 01:11:08,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:11:08,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2020-07-20 01:11:08,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335993240] [2020-07-20 01:11:08,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 01:11:08,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:08,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 01:11:08,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-07-20 01:11:08,018 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 10 states. [2020-07-20 01:11:08,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:08,194 INFO L93 Difference]: Finished difference Result 51 states and 78 transitions. [2020-07-20 01:11:08,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 01:11:08,195 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-20 01:11:08,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:08,198 INFO L225 Difference]: With dead ends: 51 [2020-07-20 01:11:08,198 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 01:11:08,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2020-07-20 01:11:08,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 01:11:08,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2020-07-20 01:11:08,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 01:11:08,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-07-20 01:11:08,210 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-07-20 01:11:08,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:08,210 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-07-20 01:11:08,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 01:11:08,211 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-07-20 01:11:08,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-20 01:11:08,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:08,213 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] [2020-07-20 01:11:08,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-20 01:11:08,427 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:08,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:08,429 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-07-20 01:11:08,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:08,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869556574] [2020-07-20 01:11:08,430 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:08,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:08,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:08,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:08,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:08,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:08,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:08,644 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 01:11:08,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869556574] [2020-07-20 01:11:08,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469638013] [2020-07-20 01:11:08,645 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1ac29d4d No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:08,690 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1ac29d4d issued 4 check-sat command(s) [2020-07-20 01:11:08,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:11:08,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 01:11:08,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:11:08,743 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 01:11:08,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:11:08,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 14 [2020-07-20 01:11:08,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506333550] [2020-07-20 01:11:08,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 01:11:08,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:08,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 01:11:08,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-07-20 01:11:08,746 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 14 states. [2020-07-20 01:11:09,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:09,258 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2020-07-20 01:11:09,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 01:11:09,258 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-07-20 01:11:09,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:09,262 INFO L225 Difference]: With dead ends: 54 [2020-07-20 01:11:09,262 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 01:11:09,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-07-20 01:11:09,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 01:11:09,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2020-07-20 01:11:09,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 01:11:09,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 53 transitions. [2020-07-20 01:11:09,278 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 53 transitions. Word has length 35 [2020-07-20 01:11:09,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:09,279 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 53 transitions. [2020-07-20 01:11:09,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 01:11:09,279 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 53 transitions. [2020-07-20 01:11:09,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 01:11:09,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:09,281 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:11:09,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:09,496 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:09,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:09,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 2 times [2020-07-20 01:11:09,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:09,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400787662] [2020-07-20 01:11:09,498 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:09,739 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-07-20 01:11:09,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400787662] [2020-07-20 01:11:09,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870578029] [2020-07-20 01:11:09,740 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7085a7d2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:09,784 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7085a7d2 issued 4 check-sat command(s) [2020-07-20 01:11:09,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:11:09,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 01:11:09,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:11:09,819 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-20 01:11:09,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:11:09,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 15 [2020-07-20 01:11:09,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136863190] [2020-07-20 01:11:09,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 01:11:09,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:09,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 01:11:09,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-07-20 01:11:09,822 INFO L87 Difference]: Start difference. First operand 36 states and 53 transitions. Second operand 15 states. [2020-07-20 01:11:10,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:10,401 INFO L93 Difference]: Finished difference Result 65 states and 116 transitions. [2020-07-20 01:11:10,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 01:11:10,402 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-07-20 01:11:10,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:10,405 INFO L225 Difference]: With dead ends: 65 [2020-07-20 01:11:10,405 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 01:11:10,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 01:11:10,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 01:11:10,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2020-07-20 01:11:10,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 01:11:10,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2020-07-20 01:11:10,420 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 42 [2020-07-20 01:11:10,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:10,421 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2020-07-20 01:11:10,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 01:11:10,421 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2020-07-20 01:11:10,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 01:11:10,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:10,423 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:11:10,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:10,636 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:10,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:10,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1051926487, now seen corresponding path program 3 times [2020-07-20 01:11:10,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:10,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687296561] [2020-07-20 01:11:10,638 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:10,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:10,756 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 01:11:10,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687296561] [2020-07-20 01:11:10,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580361759] [2020-07-20 01:11:10,758 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7e175eb5 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:10,793 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7e175eb5 issued 2 check-sat command(s) [2020-07-20 01:11:10,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:11:10,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 01:11:10,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:11:10,855 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 01:11:10,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:11:10,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 01:11:10,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896931493] [2020-07-20 01:11:10,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 01:11:10,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:10,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 01:11:10,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-20 01:11:10,859 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand 11 states. [2020-07-20 01:11:11,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:11,049 INFO L93 Difference]: Finished difference Result 82 states and 155 transitions. [2020-07-20 01:11:11,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 01:11:11,050 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2020-07-20 01:11:11,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:11,052 INFO L225 Difference]: With dead ends: 82 [2020-07-20 01:11:11,053 INFO L226 Difference]: Without dead ends: 56 [2020-07-20 01:11:11,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2020-07-20 01:11:11,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-20 01:11:11,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-20 01:11:11,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 01:11:11,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 96 transitions. [2020-07-20 01:11:11,076 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 96 transitions. Word has length 42 [2020-07-20 01:11:11,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:11,076 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 96 transitions. [2020-07-20 01:11:11,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 01:11:11,076 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 96 transitions. [2020-07-20 01:11:11,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 01:11:11,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:11,079 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] [2020-07-20 01:11:11,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:11,294 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:11,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:11,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1391486109, now seen corresponding path program 4 times [2020-07-20 01:11:11,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:11,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067577796] [2020-07-20 01:11:11,296 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:11,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,353 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2020-07-20 01:11:11,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067577796] [2020-07-20 01:11:11,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026894660] [2020-07-20 01:11:11,354 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@58c6d2a3 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:11,394 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@58c6d2a3 issued 3 check-sat command(s) [2020-07-20 01:11:11,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:11:11,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 01:11:11,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:11:11,426 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 46 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 01:11:11,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:11:11,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 01:11:11,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293681661] [2020-07-20 01:11:11,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 01:11:11,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:11,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 01:11:11,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 01:11:11,429 INFO L87 Difference]: Start difference. First operand 56 states and 96 transitions. Second operand 6 states. [2020-07-20 01:11:11,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:11,496 INFO L93 Difference]: Finished difference Result 100 states and 201 transitions. [2020-07-20 01:11:11,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 01:11:11,497 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 49 [2020-07-20 01:11:11,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:11,499 INFO L225 Difference]: With dead ends: 100 [2020-07-20 01:11:11,499 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 01:11:11,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 01:11:11,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 01:11:11,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 01:11:11,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 01:11:11,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 97 transitions. [2020-07-20 01:11:11,528 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 97 transitions. Word has length 49 [2020-07-20 01:11:11,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:11,531 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 97 transitions. [2020-07-20 01:11:11,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 01:11:11,531 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 97 transitions. [2020-07-20 01:11:11,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 01:11:11,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:11:11,537 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:11:11,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-07-20 01:11:11,739 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:11:11,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:11:11,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1732137516, now seen corresponding path program 5 times [2020-07-20 01:11:11,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:11:11,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009590408] [2020-07-20 01:11:11,741 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@14ca33b5 [2020-07-20 01:11:11,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:11:11,974 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 29 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-07-20 01:11:11,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009590408] [2020-07-20 01:11:11,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669162819] [2020-07-20 01:11:11,975 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1c29a98d No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:12,019 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1c29a98d issued 4 check-sat command(s) [2020-07-20 01:11:12,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:11:12,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 01:11:12,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:11:12,069 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 42 proven. 37 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-20 01:11:12,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:11:12,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 16 [2020-07-20 01:11:12,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834543952] [2020-07-20 01:11:12,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 01:11:12,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:11:12,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 01:11:12,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2020-07-20 01:11:12,072 INFO L87 Difference]: Start difference. First operand 57 states and 97 transitions. Second operand 16 states. [2020-07-20 01:11:12,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:11:12,606 INFO L93 Difference]: Finished difference Result 104 states and 212 transitions. [2020-07-20 01:11:12,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 01:11:12,607 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 62 [2020-07-20 01:11:12,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:11:12,609 INFO L225 Difference]: With dead ends: 104 [2020-07-20 01:11:12,609 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 01:11:12,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=249, Invalid=873, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 01:11:12,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 01:11:12,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 01:11:12,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 01:11:12,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 01:11:12,613 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 62 [2020-07-20 01:11:12,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:11:12,613 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 01:11:12,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 01:11:12,614 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 01:11:12,614 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 01:11:12,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:11:12,826 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 01:11:13,327 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 25 [2020-07-20 01:11:13,399 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 01:11:13,399 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 01:11:13,400 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 01:11:13,400 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 01:11:13,400 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 01:11:13,400 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 01:11:13,400 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-07-20 01:11:13,400 INFO L264 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|))) [2020-07-20 01:11:13,401 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-07-20 01:11:13,401 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-07-20 01:11:13,401 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|)) (= 0 |ackermann_#in~n|)) [2020-07-20 01:11:13,401 INFO L264 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse0 (<= 3 |ackermann_#t~ret1|))) (and (or (= 1 |ackermann_#in~n|) .cse0 (and (<= 2 |ackermann_#res|) (<= (+ |ackermann_#in~n| 1) |ackermann_#res|))) (let ((.cse1 (= ackermann_~m |ackermann_#in~m|)) (.cse2 (= ackermann_~n |ackermann_#in~n|)) (.cse3 (<= 1 |ackermann_#in~m|))) (or (and .cse0 .cse1 .cse2 .cse3) (and .cse1 .cse2 (<= 2 |ackermann_#t~ret1|) (<= ackermann_~m 1) .cse3))))) [2020-07-20 01:11:13,401 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-07-20 01:11:13,401 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-20 01:11:13,402 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-07-20 01:11:13,402 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-07-20 01:11:13,402 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-07-20 01:11:13,402 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-07-20 01:11:13,402 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-07-20 01:11:13,402 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-07-20 01:11:13,402 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-07-20 01:11:13,403 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-07-20 01:11:13,403 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-07-20 01:11:13,403 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-07-20 01:11:13,403 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-07-20 01:11:13,403 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-07-20 01:11:13,403 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-07-20 01:11:13,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:11:13 BoogieIcfgContainer [2020-07-20 01:11:13,411 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 01:11:13,413 INFO L168 Benchmark]: Toolchain (without parser) took 7375.39 ms. Allocated memory was 144.7 MB in the beginning and 280.5 MB in the end (delta: 135.8 MB). Free memory was 102.2 MB in the beginning and 173.3 MB in the end (delta: -71.2 MB). Peak memory consumption was 143.0 MB. Max. memory is 7.1 GB. [2020-07-20 01:11:13,414 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 144.7 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 01:11:13,415 INFO L168 Benchmark]: CACSL2BoogieTranslator took 241.52 ms. Allocated memory is still 144.7 MB. Free memory was 101.7 MB in the beginning and 91.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-20 01:11:13,416 INFO L168 Benchmark]: Boogie Preprocessor took 110.06 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.9 MB in the beginning and 181.1 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-20 01:11:13,417 INFO L168 Benchmark]: RCFGBuilder took 276.03 ms. Allocated memory is still 201.9 MB. Free memory was 181.1 MB in the beginning and 167.6 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-07-20 01:11:13,417 INFO L168 Benchmark]: TraceAbstraction took 6741.16 ms. Allocated memory was 201.9 MB in the beginning and 280.5 MB in the end (delta: 78.6 MB). Free memory was 167.0 MB in the beginning and 173.3 MB in the end (delta: -6.4 MB). Peak memory consumption was 150.7 MB. Max. memory is 7.1 GB. [2020-07-20 01:11:13,421 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 144.7 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 241.52 ms. Allocated memory is still 144.7 MB. Free memory was 101.7 MB in the beginning and 91.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.06 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.9 MB in the beginning and 181.1 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 276.03 ms. Allocated memory is still 201.9 MB. Free memory was 181.1 MB in the beginning and 167.6 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6741.16 ms. Allocated memory was 201.9 MB in the beginning and 280.5 MB in the end (delta: 78.6 MB). Free memory was 167.0 MB in the beginning and 173.3 MB in the end (delta: -6.4 MB). Peak memory consumption was 150.7 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: 6.0s, OverallIterations: 8, TraceHistogramMax: 8, AutomataDifference: 2.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 185 SDtfs, 185 SDslu, 836 SDs, 0 SdLazy, 1456 SolverSat, 298 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 471 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=57occurred 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, 48 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 133 PreInvPairs, 166 NumberOfFragments, 88 HoareAnnotationTreeSize, 133 FomulaSimplifications, 10836 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 9 FomulaSimplificationsInter, 388 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 553 NumberOfCodeBlocks, 516 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 539 ConstructedInterpolants, 0 QuantifiedInterpolants, 44151 SizeOfPredicates, 22 NumberOfNonLiveVariables, 712 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 522/666 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...