/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/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 12:15:43,430 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 12:15:43,433 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 12:15:43,475 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 12:15:43,475 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 12:15:43,488 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 12:15:43,490 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 12:15:43,492 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 12:15:43,495 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 12:15:43,497 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 12:15:43,498 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 12:15:43,501 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 12:15:43,501 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 12:15:43,504 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 12:15:43,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 12:15:43,506 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 12:15:43,507 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 12:15:43,508 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 12:15:43,509 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 12:15:43,511 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 12:15:43,512 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 12:15:43,513 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 12:15:43,514 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 12:15:43,515 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 12:15:43,517 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 12:15:43,525 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 12:15:43,525 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 12:15:43,526 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 12:15:43,527 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 12:15:43,550 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 12:15:43,550 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 12:15:43,551 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 12:15:43,552 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 12:15:43,552 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 12:15:43,552 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 12:15:43,552 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 12:15:43,552 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 12:15:43,553 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 12:15:43,553 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 12:15:43,553 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 12:15:43,553 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 12:15:43,553 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 12:15:43,554 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 12:15:43,554 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 12:15:43,554 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 12:15:43,554 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 12:15:43,554 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 12:15:43,555 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 12:15:43,555 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 12:15:43,555 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 12:15:43,555 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 12:15:43,555 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 12:15:43,556 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 12:15:43,556 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 12:15:43,556 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 12:15:43,556 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 12:15:43,556 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 12:15:43,557 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 12:15:43,557 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 12:15:43,862 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 12:15:43,881 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 12:15:43,885 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 12:15:43,887 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 12:15:43,887 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 12:15:43,889 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-18 12:15:43,965 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f55b40fe0/b2cb5e325ce944d0a7c5635da3bde016/FLAG4bba607fa [2020-08-18 12:15:44,416 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 12:15:44,418 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-18 12:15:44,424 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f55b40fe0/b2cb5e325ce944d0a7c5635da3bde016/FLAG4bba607fa [2020-08-18 12:15:44,776 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f55b40fe0/b2cb5e325ce944d0a7c5635da3bde016 [2020-08-18 12:15:44,786 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 12:15:44,788 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 12:15:44,789 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 12:15:44,790 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 12:15:44,796 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 12:15:44,797 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:15:44" (1/1) ... [2020-08-18 12:15:44,800 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d48379c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:44, skipping insertion in model container [2020-08-18 12:15:44,800 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:15:44" (1/1) ... [2020-08-18 12:15:44,808 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 12:15:44,826 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 12:15:45,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 12:15:45,017 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 12:15:45,038 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 12:15:45,057 INFO L208 MainTranslator]: Completed translation [2020-08-18 12:15:45,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45 WrapperNode [2020-08-18 12:15:45,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 12:15:45,059 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 12:15:45,059 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 12:15:45,059 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 12:15:45,159 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,159 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,168 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,175 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,181 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,185 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (1/1) ... [2020-08-18 12:15:45,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 12:15:45,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 12:15:45,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 12:15:45,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 12:15:45,189 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (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 12:15:45,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 12:15:45,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 12:15:45,262 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 12:15:45,262 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 12:15:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 12:15:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 12:15:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 12:15:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 12:15:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-18 12:15:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 12:15:45,265 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 12:15:45,265 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 12:15:45,265 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 12:15:45,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 12:15:45,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 12:15:45,266 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 12:15:45,579 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 12:15:45,579 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 12:15:45,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:15:45 BoogieIcfgContainer [2020-08-18 12:15:45,584 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 12:15:45,585 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 12:15:45,585 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 12:15:45,589 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 12:15:45,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 12:15:44" (1/3) ... [2020-08-18 12:15:45,590 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2447a828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:15:45, skipping insertion in model container [2020-08-18 12:15:45,590 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:15:45" (2/3) ... [2020-08-18 12:15:45,591 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2447a828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:15:45, skipping insertion in model container [2020-08-18 12:15:45,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:15:45" (3/3) ... [2020-08-18 12:15:45,593 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-18 12:15:45,603 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 12:15:45,610 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 12:15:45,624 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 12:15:45,647 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 12:15:45,647 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 12:15:45,647 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 12:15:45,647 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 12:15:45,647 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 12:15:45,648 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 12:15:45,648 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 12:15:45,648 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 12:15:45,665 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-18 12:15:45,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 12:15:45,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:45,671 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:45,672 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:45,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:45,677 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-18 12:15:45,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:45,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41669390] [2020-08-18 12:15:45,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:45,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:45,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:45,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:45,866 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 12:15:45,867 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41669390] [2020-08-18 12:15:45,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:15:45,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 12:15:45,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361685090] [2020-08-18 12:15:45,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 12:15:45,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:45,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 12:15:45,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 12:15:45,892 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-18 12:15:45,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:45,988 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-18 12:15:45,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 12:15:45,990 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 12:15:45,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:45,999 INFO L225 Difference]: With dead ends: 51 [2020-08-18 12:15:45,999 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 12:15:46,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 12:15:46,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 12:15:46,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 12:15:46,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 12:15:46,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 12:15:46,046 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-18 12:15:46,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:46,046 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 12:15:46,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 12:15:46,047 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 12:15:46,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 12:15:46,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:46,048 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:46,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 12:15:46,049 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:46,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:46,050 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-18 12:15:46,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:46,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662275531] [2020-08-18 12:15:46,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:46,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:46,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:46,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:46,167 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 12:15:46,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662275531] [2020-08-18 12:15:46,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:15:46,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 12:15:46,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083917039] [2020-08-18 12:15:46,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 12:15:46,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:46,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 12:15:46,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 12:15:46,171 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-18 12:15:46,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:46,279 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-18 12:15:46,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 12:15:46,280 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 12:15:46,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:46,283 INFO L225 Difference]: With dead ends: 44 [2020-08-18 12:15:46,283 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 12:15:46,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 12:15:46,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 12:15:46,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-18 12:15:46,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 12:15:46,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-18 12:15:46,297 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-18 12:15:46,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:46,297 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-18 12:15:46,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 12:15:46,298 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-18 12:15:46,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 12:15:46,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:46,299 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:46,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 12:15:46,299 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:46,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:46,300 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-18 12:15:46,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:46,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694707157] [2020-08-18 12:15:46,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:46,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:46,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:46,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:46,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 12:15:46,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694707157] [2020-08-18 12:15:46,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:15:46,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 12:15:46,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780568133] [2020-08-18 12:15:46,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 12:15:46,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:46,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 12:15:46,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 12:15:46,414 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-18 12:15:46,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:46,551 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-18 12:15:46,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 12:15:46,552 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-18 12:15:46,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:46,553 INFO L225 Difference]: With dead ends: 37 [2020-08-18 12:15:46,553 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 12:15:46,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 12:15:46,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 12:15:46,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 12:15:46,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 12:15:46,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 12:15:46,561 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-18 12:15:46,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:46,562 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 12:15:46,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 12:15:46,562 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 12:15:46,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 12:15:46,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:46,563 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:46,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 12:15:46,564 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:46,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:46,564 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-18 12:15:46,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:46,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967146145] [2020-08-18 12:15:46,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:46,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:47,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:47,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:47,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:15:47,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967146145] [2020-08-18 12:15:47,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:47,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 12:15:47,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114522443] [2020-08-18 12:15:47,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 12:15:47,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:47,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 12:15:47,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-18 12:15:47,013 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-18 12:15:47,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:47,548 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 12:15:47,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 12:15:47,549 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-18 12:15:47,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:47,550 INFO L225 Difference]: With dead ends: 50 [2020-08-18 12:15:47,550 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 12:15:47,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-18 12:15:47,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 12:15:47,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-18 12:15:47,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 12:15:47,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 12:15:47,563 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-18 12:15:47,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:47,564 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 12:15:47,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 12:15:47,564 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 12:15:47,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 12:15:47,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:47,565 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, 1] [2020-08-18 12:15:47,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 12:15:47,566 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:47,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:47,567 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-18 12:15:47,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:47,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872571853] [2020-08-18 12:15:47,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:47,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:47,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:47,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:47,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:15:47,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872571853] [2020-08-18 12:15:47,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:47,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 12:15:47,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796099445] [2020-08-18 12:15:47,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 12:15:47,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:47,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 12:15:47,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-18 12:15:47,674 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-18 12:15:47,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:47,869 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-18 12:15:47,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 12:15:47,870 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-18 12:15:47,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:47,871 INFO L225 Difference]: With dead ends: 59 [2020-08-18 12:15:47,871 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 12:15:47,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-18 12:15:47,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 12:15:47,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-18 12:15:47,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 12:15:47,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 12:15:47,881 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-18 12:15:47,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:47,881 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 12:15:47,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 12:15:47,882 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 12:15:47,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 12:15:47,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:47,883 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:47,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 12:15:47,883 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:47,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:47,884 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-18 12:15:47,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:47,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [846094893] [2020-08-18 12:15:47,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:47,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:48,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:48,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:48,283 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:15:48,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [846094893] [2020-08-18 12:15:48,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:48,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 12:15:48,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482656981] [2020-08-18 12:15:48,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 12:15:48,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:48,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 12:15:48,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-18 12:15:48,290 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-18 12:15:49,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:49,123 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-18 12:15:49,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 12:15:49,124 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-18 12:15:49,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:49,128 INFO L225 Difference]: With dead ends: 70 [2020-08-18 12:15:49,130 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 12:15:49,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-18 12:15:49,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 12:15:49,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-18 12:15:49,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 12:15:49,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-18 12:15:49,149 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-18 12:15:49,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:49,149 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-18 12:15:49,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 12:15:49,150 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-18 12:15:49,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 12:15:49,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:49,152 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:49,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 12:15:49,152 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:49,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:49,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-18 12:15:49,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:49,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352171682] [2020-08-18 12:15:49,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:49,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:49,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:49,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:49,270 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:15:49,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352171682] [2020-08-18 12:15:49,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:49,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 12:15:49,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765673798] [2020-08-18 12:15:49,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 12:15:49,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:49,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 12:15:49,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 12:15:49,273 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-18 12:15:49,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:49,498 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-18 12:15:49,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 12:15:49,499 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-18 12:15:49,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:49,500 INFO L225 Difference]: With dead ends: 74 [2020-08-18 12:15:49,501 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 12:15:49,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 12:15:49,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 12:15:49,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-18 12:15:49,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 12:15:49,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-18 12:15:49,511 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-18 12:15:49,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:49,512 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-18 12:15:49,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 12:15:49,512 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-18 12:15:49,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 12:15:49,513 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:49,513 INFO L422 BasicCegarLoop]: trace histogram [2, 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] [2020-08-18 12:15:49,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 12:15:49,514 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:49,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:49,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-18 12:15:49,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:49,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558310108] [2020-08-18 12:15:49,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:49,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:49,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:49,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:49,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 12:15:49,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:49,630 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 12:15:49,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558310108] [2020-08-18 12:15:49,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:49,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 12:15:49,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161860902] [2020-08-18 12:15:49,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 12:15:49,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:49,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 12:15:49,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 12:15:49,633 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-18 12:15:49,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:49,799 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-18 12:15:49,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 12:15:49,800 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-18 12:15:49,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:49,802 INFO L225 Difference]: With dead ends: 75 [2020-08-18 12:15:49,803 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 12:15:49,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 12:15:49,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 12:15:49,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-18 12:15:49,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 12:15:49,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-18 12:15:49,821 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-18 12:15:49,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:49,821 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-18 12:15:49,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 12:15:49,822 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-18 12:15:49,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 12:15:49,825 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:49,826 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:49,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 12:15:49,826 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:49,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:49,827 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-18 12:15:49,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:49,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925132625] [2020-08-18 12:15:49,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:49,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:50,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:50,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:50,211 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:15:50,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925132625] [2020-08-18 12:15:50,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:50,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 12:15:50,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052753584] [2020-08-18 12:15:50,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 12:15:50,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:50,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 12:15:50,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-18 12:15:50,218 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-18 12:15:51,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:51,708 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-18 12:15:51,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 12:15:51,709 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-18 12:15:51,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:51,711 INFO L225 Difference]: With dead ends: 97 [2020-08-18 12:15:51,711 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 12:15:51,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 12:15:51,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 12:15:51,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-18 12:15:51,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 12:15:51,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-18 12:15:51,735 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-18 12:15:51,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:51,736 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-18 12:15:51,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 12:15:51,742 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-18 12:15:51,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 12:15:51,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:51,743 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:51,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 12:15:51,744 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:51,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:51,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-18 12:15:51,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:51,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890591945] [2020-08-18 12:15:51,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:51,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:51,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:15:51,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:15:51,854 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:15:51,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890591945] [2020-08-18 12:15:51,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 12:15:51,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 12:15:51,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551446959] [2020-08-18 12:15:51,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 12:15:51,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:15:51,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 12:15:51,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 12:15:51,857 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-18 12:15:52,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:15:52,137 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-18 12:15:52,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 12:15:52,137 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-18 12:15:52,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:15:52,138 INFO L225 Difference]: With dead ends: 88 [2020-08-18 12:15:52,139 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 12:15:52,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-18 12:15:52,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 12:15:52,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-18 12:15:52,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 12:15:52,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-18 12:15:52,150 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-18 12:15:52,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:15:52,150 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-18 12:15:52,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 12:15:52,150 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-18 12:15:52,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 12:15:52,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:15:52,152 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:15:52,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 12:15:52,152 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:15:52,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:15:52,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-18 12:15:52,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:15:52,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581541231] [2020-08-18 12:15:52,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:15:52,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 12:15:52,175 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 12:15:52,175 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 12:15:52,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 12:15:52,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 12:15:52 BoogieIcfgContainer [2020-08-18 12:15:52,204 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 12:15:52,211 INFO L168 Benchmark]: Toolchain (without parser) took 7422.40 ms. Allocated memory was 146.8 MB in the beginning and 292.6 MB in the end (delta: 145.8 MB). Free memory was 103.0 MB in the beginning and 178.7 MB in the end (delta: -75.7 MB). Peak memory consumption was 70.1 MB. Max. memory is 7.1 GB. [2020-08-18 12:15:52,211 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 146.8 MB. Free memory was 121.4 MB in the beginning and 121.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 12:15:52,212 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.05 ms. Allocated memory is still 146.8 MB. Free memory was 102.8 MB in the beginning and 92.4 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-18 12:15:52,212 INFO L168 Benchmark]: Boogie Preprocessor took 128.59 ms. Allocated memory was 146.8 MB in the beginning and 202.9 MB in the end (delta: 56.1 MB). Free memory was 92.4 MB in the beginning and 180.5 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-08-18 12:15:52,213 INFO L168 Benchmark]: RCFGBuilder took 396.06 ms. Allocated memory is still 202.9 MB. Free memory was 180.5 MB in the beginning and 163.6 MB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 7.1 GB. [2020-08-18 12:15:52,214 INFO L168 Benchmark]: TraceAbstraction took 6619.02 ms. Allocated memory was 202.9 MB in the beginning and 292.6 MB in the end (delta: 89.7 MB). Free memory was 163.6 MB in the beginning and 178.7 MB in the end (delta: -15.1 MB). Peak memory consumption was 74.6 MB. Max. memory is 7.1 GB. [2020-08-18 12:15:52,217 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 146.8 MB. Free memory was 121.4 MB in the beginning and 121.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.05 ms. Allocated memory is still 146.8 MB. Free memory was 102.8 MB in the beginning and 92.4 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.59 ms. Allocated memory was 146.8 MB in the beginning and 202.9 MB in the end (delta: 56.1 MB). Free memory was 92.4 MB in the beginning and 180.5 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 396.06 ms. Allocated memory is still 202.9 MB. Free memory was 180.5 MB in the beginning and 163.6 MB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6619.02 ms. Allocated memory was 202.9 MB in the beginning and 292.6 MB in the end (delta: 89.7 MB). Free memory was 163.6 MB in the beginning and 178.7 MB in the end (delta: -15.1 MB). Peak memory consumption was 74.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i