/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.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 12:08:09,507 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 12:08:09,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 12:08:09,550 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 12:08:09,559 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 12:08:09,560 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 12:08:09,562 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 12:08:09,563 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 12:08:09,563 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 12:08:09,564 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 12:08:09,566 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 12:08:09,568 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 12:08:09,569 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 12:08:09,571 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 12:08:09,572 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 12:08:09,572 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 12:08:09,575 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 12:08:09,575 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 12:08:09,576 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 12:08:09,577 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 12:08:09,577 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 12:08:09,578 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-18 12:08:09,583 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 12:08:09,584 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 12:08:09,584 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 12:08:09,585 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 12:08:09,608 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 12:08:09,608 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 12:08:09,609 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 12:08:09,609 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 12:08:09,610 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 12:08:09,610 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 12:08:09,610 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 12:08:09,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 12:08:09,611 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 12:08:09,611 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 12:08:09,611 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 12:08:09,611 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 12:08:09,611 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 12:08:09,612 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 12:08:09,612 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 12:08:09,612 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 12:08:09,612 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 12:08:09,612 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 12:08:09,612 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 12:08:09,613 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 12:08:09,613 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 12:08:09,613 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 12:08:09,613 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 12:08:09,614 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 12:08:09,614 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 12:08:09,614 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 12:08:09,614 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 12:08:09,614 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 12:08:09,615 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 12:08:09,615 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 12:08:09,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 12:08:09,927 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 12:08:09,931 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 12:08:09,934 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 12:08:09,935 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 12:08:09,936 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-08-18 12:08:10,011 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cec52c541/a321ec8242914126bec93ce1132bbd0e/FLAG28a1af36d [2020-08-18 12:08:10,418 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 12:08:10,420 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-08-18 12:08:10,426 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cec52c541/a321ec8242914126bec93ce1132bbd0e/FLAG28a1af36d [2020-08-18 12:08:10,805 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cec52c541/a321ec8242914126bec93ce1132bbd0e [2020-08-18 12:08:10,815 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 12:08:10,817 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 12:08:10,818 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 12:08:10,818 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 12:08:10,823 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 12:08:10,824 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:08:10" (1/1) ... [2020-08-18 12:08:10,827 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56c6fcf2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:10, skipping insertion in model container [2020-08-18 12:08:10,827 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:08:10" (1/1) ... [2020-08-18 12:08:10,837 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 12:08:10,855 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 12:08:11,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 12:08:11,020 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 12:08:11,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 12:08:11,050 INFO L208 MainTranslator]: Completed translation [2020-08-18 12:08:11,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11 WrapperNode [2020-08-18 12:08:11,051 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 12:08:11,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 12:08:11,052 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 12:08:11,052 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 12:08:11,066 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,071 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,072 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,075 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,077 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,078 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... [2020-08-18 12:08:11,079 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 12:08:11,080 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 12:08:11,080 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 12:08:11,080 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 12:08:11,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-18 12:08:11,218 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 12:08:11,219 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 12:08:11,219 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-18 12:08:11,219 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 12:08:11,219 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 12:08:11,220 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 12:08:11,220 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-18 12:08:11,220 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 12:08:11,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 12:08:11,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 12:08:11,383 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 12:08:11,384 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 12:08:11,388 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:08:11 BoogieIcfgContainer [2020-08-18 12:08:11,388 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 12:08:11,389 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 12:08:11,389 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 12:08:11,394 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 12:08:11,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 12:08:10" (1/3) ... [2020-08-18 12:08:11,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b0ba8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:08:11, skipping insertion in model container [2020-08-18 12:08:11,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:08:11" (2/3) ... [2020-08-18 12:08:11,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b0ba8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:08:11, skipping insertion in model container [2020-08-18 12:08:11,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:08:11" (3/3) ... [2020-08-18 12:08:11,397 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-08-18 12:08:11,407 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 12:08:11,414 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 12:08:11,428 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 12:08:11,453 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 12:08:11,453 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 12:08:11,453 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 12:08:11,454 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 12:08:11,454 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 12:08:11,454 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 12:08:11,454 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 12:08:11,454 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 12:08:11,472 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 12:08:11,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 12:08:11,479 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:08:11,480 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:08:11,480 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:08:11,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:08:11,485 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-18 12:08:11,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:08:11,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902997170] [2020-08-18 12:08:11,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:08:11,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:11,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:08:11,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:11,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 12:08:11,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:11,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:08:11,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902997170] [2020-08-18 12:08:11,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:08:11,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 12:08:11,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491874859] [2020-08-18 12:08:11,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 12:08:11,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:08:11,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 12:08:11,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 12:08:11,851 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-18 12:08:11,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:08:11,992 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-18 12:08:11,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 12:08:11,996 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 12:08:11,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:08:12,011 INFO L225 Difference]: With dead ends: 30 [2020-08-18 12:08:12,012 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 12:08:12,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 12:08:12,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 12:08:12,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 12:08:12,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 12:08:12,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-18 12:08:12,056 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-18 12:08:12,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:08:12,057 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-18 12:08:12,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 12:08:12,058 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-18 12:08:12,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 12:08:12,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:08:12,060 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:08:12,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 12:08:12,061 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:08:12,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:08:12,062 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-18 12:08:12,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:08:12,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301261908] [2020-08-18 12:08:12,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:08:12,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:08:12,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 12:08:12,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 12:08:12,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301261908] [2020-08-18 12:08:12,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:08:12,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 12:08:12,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461206590] [2020-08-18 12:08:12,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 12:08:12,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:08:12,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 12:08:12,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 12:08:12,192 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-18 12:08:12,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:08:12,258 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-18 12:08:12,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 12:08:12,259 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 12:08:12,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:08:12,260 INFO L225 Difference]: With dead ends: 25 [2020-08-18 12:08:12,260 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 12:08:12,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-18 12:08:12,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 12:08:12,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 12:08:12,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 12:08:12,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 12:08:12,268 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-18 12:08:12,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:08:12,269 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 12:08:12,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 12:08:12,269 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 12:08:12,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 12:08:12,271 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:08:12,271 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:08:12,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 12:08:12,271 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:08:12,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:08:12,272 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-18 12:08:12,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:08:12,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702051286] [2020-08-18 12:08:12,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:08:12,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:08:12,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 12:08:12,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,469 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-18 12:08:12,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702051286] [2020-08-18 12:08:12,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:08:12,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 12:08:12,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873403802] [2020-08-18 12:08:12,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 12:08:12,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:08:12,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 12:08:12,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 12:08:12,472 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-18 12:08:12,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:08:12,534 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-18 12:08:12,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 12:08:12,535 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-18 12:08:12,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:08:12,537 INFO L225 Difference]: With dead ends: 28 [2020-08-18 12:08:12,537 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 12:08:12,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 12:08:12,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 12:08:12,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 12:08:12,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 12:08:12,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-18 12:08:12,545 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-18 12:08:12,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:08:12,545 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-18 12:08:12,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 12:08:12,545 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-18 12:08:12,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 12:08:12,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:08:12,547 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:08:12,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 12:08:12,547 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:08:12,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:08:12,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-18 12:08:12,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:08:12,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049077591] [2020-08-18 12:08:12,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:08:12,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:08:12,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 12:08:12,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,703 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-18 12:08:12,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049077591] [2020-08-18 12:08:12,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:08:12,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 12:08:12,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980604130] [2020-08-18 12:08:12,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 12:08:12,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:08:12,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 12:08:12,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 12:08:12,706 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-18 12:08:12,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:08:12,806 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-18 12:08:12,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 12:08:12,807 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-18 12:08:12,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:08:12,808 INFO L225 Difference]: With dead ends: 31 [2020-08-18 12:08:12,808 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 12:08:12,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-18 12:08:12,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 12:08:12,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 12:08:12,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 12:08:12,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 12:08:12,816 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-18 12:08:12,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:08:12,816 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 12:08:12,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 12:08:12,817 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 12:08:12,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 12:08:12,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:08:12,818 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:08:12,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 12:08:12,819 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:08:12,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:08:12,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-18 12:08:12,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:08:12,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556510872] [2020-08-18 12:08:12,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:08:12,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:08:12,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 12:08:12,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:12,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 12:08:12,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:08:13,029 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-18 12:08:13,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556510872] [2020-08-18 12:08:13,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:08:13,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 12:08:13,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993723053] [2020-08-18 12:08:13,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 12:08:13,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:08:13,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 12:08:13,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-18 12:08:13,032 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-18 12:08:13,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:08:13,121 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-18 12:08:13,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 12:08:13,122 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-18 12:08:13,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:08:13,123 INFO L225 Difference]: With dead ends: 34 [2020-08-18 12:08:13,124 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 12:08:13,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-18 12:08:13,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 12:08:13,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 12:08:13,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 12:08:13,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-18 12:08:13,132 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-18 12:08:13,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:08:13,132 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-18 12:08:13,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 12:08:13,133 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-18 12:08:13,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 12:08:13,134 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:08:13,134 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:08:13,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 12:08:13,135 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:08:13,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:08:13,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-18 12:08:13,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:08:13,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092769710] [2020-08-18 12:08:13,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:08:13,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 12:08:13,150 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 12:08:13,152 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 12:08:13,157 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 12:08:13,177 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 12:08:13 BoogieIcfgContainer [2020-08-18 12:08:13,178 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 12:08:13,181 INFO L168 Benchmark]: Toolchain (without parser) took 2363.12 ms. Allocated memory was 139.5 MB in the beginning and 234.9 MB in the end (delta: 95.4 MB). Free memory was 102.5 MB in the beginning and 164.7 MB in the end (delta: -62.2 MB). Peak memory consumption was 33.2 MB. Max. memory is 7.1 GB. [2020-08-18 12:08:13,182 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 139.5 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 12:08:13,183 INFO L168 Benchmark]: CACSL2BoogieTranslator took 233.17 ms. Allocated memory is still 139.5 MB. Free memory was 102.0 MB in the beginning and 92.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-08-18 12:08:13,184 INFO L168 Benchmark]: Boogie Preprocessor took 27.74 ms. Allocated memory is still 139.5 MB. Free memory was 92.9 MB in the beginning and 91.7 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.2 MB. Max. memory is 7.1 GB. [2020-08-18 12:08:13,185 INFO L168 Benchmark]: RCFGBuilder took 308.55 ms. Allocated memory was 139.5 MB in the beginning and 201.3 MB in the end (delta: 61.9 MB). Free memory was 91.5 MB in the beginning and 169.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-18 12:08:13,186 INFO L168 Benchmark]: TraceAbstraction took 1788.79 ms. Allocated memory was 201.3 MB in the beginning and 234.9 MB in the end (delta: 33.6 MB). Free memory was 169.1 MB in the beginning and 164.7 MB in the end (delta: 4.4 MB). Peak memory consumption was 38.0 MB. Max. memory is 7.1 GB. [2020-08-18 12:08:13,190 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 139.5 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 233.17 ms. Allocated memory is still 139.5 MB. Free memory was 102.0 MB in the beginning and 92.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.74 ms. Allocated memory is still 139.5 MB. Free memory was 92.9 MB in the beginning and 91.7 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 308.55 ms. Allocated memory was 139.5 MB in the beginning and 201.3 MB in the end (delta: 61.9 MB). Free memory was 91.5 MB in the beginning and 169.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1788.79 ms. Allocated memory was 201.3 MB in the beginning and 234.9 MB in the end (delta: 33.6 MB). Free memory was 169.1 MB in the beginning and 164.7 MB in the end (delta: 4.4 MB). Peak memory consumption was 38.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 5; [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] int result = id(input); [L12] COND TRUE result == 5 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 6, TraceHistogramMax: 6, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 69 SDtfs, 58 SDslu, 176 SDs, 0 SdLazy, 105 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 168 NumberOfCodeBlocks, 168 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 120 ConstructedInterpolants, 0 QuantifiedInterpolants, 7200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 50/100 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...