/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 log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:14:25,972 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:14:25,974 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:14:25,998 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:14:25,998 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:14:25,999 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:14:26,001 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:14:26,003 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:14:26,004 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:14:26,005 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:14:26,006 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:14:26,007 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:14:26,007 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:14:26,008 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:14:26,009 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:14:26,010 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:14:26,011 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:14:26,012 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:14:26,014 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:14:26,016 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:14:26,017 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:14:26,018 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:14:26,019 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:14:26,020 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:14:26,022 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:14:26,025 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 14:14:26,026 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 14:14:26,027 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 14:14:26,027 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 14:14:26,028 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 14:14:26,029 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 14:14:26,029 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 14:14:26,030 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 14:14:26,030 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:14:26,031 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:14:26,031 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:14:26,032 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 [2020-08-21 14:14:26,068 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:14:26,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:14:26,069 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:14:26,069 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:14:26,070 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:14:26,070 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:14:26,070 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:14:26,070 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:14:26,071 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:14:26,071 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:14:26,071 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:14:26,071 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:14:26,071 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:14:26,071 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:14:26,072 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:14:26,072 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:14:26,072 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:14:26,072 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:14:26,073 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:14:26,073 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:14:26,073 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:14:26,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:14:26,073 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:14:26,075 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:14:26,075 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:14:26,075 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:14:26,076 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:14:26,076 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:14:26,076 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:14:26,076 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 -> log-additional-information=true; [2020-08-21 14:14:26,399 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:14:26,416 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:14:26,422 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:14:26,423 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:14:26,424 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:14:26,425 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 14:14:26,508 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ed5c7511c/15c1ae6f9acb447f9ec2872072d4de60/FLAGb77758efd [2020-08-21 14:14:26,979 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:14:26,980 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 14:14:26,988 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ed5c7511c/15c1ae6f9acb447f9ec2872072d4de60/FLAGb77758efd [2020-08-21 14:14:27,350 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ed5c7511c/15c1ae6f9acb447f9ec2872072d4de60 [2020-08-21 14:14:27,360 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:14:27,362 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:14:27,364 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:27,364 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:14:27,367 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:14:27,368 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,372 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@336c4a18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27, skipping insertion in model container [2020-08-21 14:14:27,372 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,381 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:14:27,401 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:14:27,579 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:27,583 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:14:27,608 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:27,627 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:14:27,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27 WrapperNode [2020-08-21 14:14:27,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:27,628 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:14:27,628 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:14:27,629 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:14:27,718 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,719 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,726 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,726 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,733 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,739 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,740 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:14:27,743 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:14:27,743 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:14:27,743 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:14:27,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (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 [2020-08-21 14:14:27,810 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:14:27,810 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:14:27,811 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 14:14:27,811 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:14:27,811 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:14:27,811 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 14:14:27,811 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 14:14:27,811 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 14:14:27,811 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 14:14:27,812 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:14:27,812 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 14:14:27,812 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 14:14:27,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 14:14:27,812 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:14:27,812 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:14:27,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:14:28,093 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:14:28,093 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 14:14:28,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:28 BoogieIcfgContainer [2020-08-21 14:14:28,097 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:14:28,105 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:14:28,105 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:14:28,119 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:14:28,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:14:27" (1/3) ... [2020-08-21 14:14:28,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@712effa6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:28, skipping insertion in model container [2020-08-21 14:14:28,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (2/3) ... [2020-08-21 14:14:28,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@712effa6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:28, skipping insertion in model container [2020-08-21 14:14:28,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:28" (3/3) ... [2020-08-21 14:14:28,128 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-21 14:14:28,141 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:14:28,148 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:14:28,162 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:14:28,184 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:14:28,184 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:14:28,184 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:14:28,184 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:14:28,184 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:14:28,184 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:14:28,184 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:14:28,185 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:14:28,203 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-21 14:14:28,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 14:14:28,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,209 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,209 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,215 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-21 14:14:28,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827508422] [2020-08-21 14:14:28,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:28,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827508422] [2020-08-21 14:14:28,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:28,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 14:14:28,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115385346] [2020-08-21 14:14:28,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 14:14:28,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:28,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 14:14:28,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:14:28,434 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-21 14:14:28,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:28,549 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-21 14:14:28,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:14:28,551 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 14:14:28,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:28,561 INFO L225 Difference]: With dead ends: 51 [2020-08-21 14:14:28,561 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 14:14:28,565 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 [2020-08-21 14:14:28,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 14:14:28,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 14:14:28,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 14:14:28,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 14:14:28,602 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-21 14:14:28,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:28,603 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 14:14:28,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 14:14:28,603 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 14:14:28,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 14:14:28,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,605 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:14:28,605 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,606 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-21 14:14:28,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773473469] [2020-08-21 14:14:28,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:28,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773473469] [2020-08-21 14:14:28,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:28,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 14:14:28,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499517773] [2020-08-21 14:14:28,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:14:28,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:28,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:14:28,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:28,741 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-21 14:14:28,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:28,859 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-21 14:14:28,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:14:28,860 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 14:14:28,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:28,863 INFO L225 Difference]: With dead ends: 44 [2020-08-21 14:14:28,863 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 14:14:28,864 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 [2020-08-21 14:14:28,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 14:14:28,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-21 14:14:28,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 14:14:28,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-21 14:14:28,878 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-21 14:14:28,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:28,879 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-21 14:14:28,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:14:28,879 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-21 14:14:28,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 14:14:28,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,880 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:14:28,881 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,881 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-21 14:14:28,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416100828] [2020-08-21 14:14:28,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:14:29,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416100828] [2020-08-21 14:14:29,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:29,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 14:14:29,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095525726] [2020-08-21 14:14:29,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:14:29,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:29,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:14:29,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:29,011 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-21 14:14:29,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:29,123 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-21 14:14:29,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:14:29,123 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 14:14:29,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:29,125 INFO L225 Difference]: With dead ends: 37 [2020-08-21 14:14:29,125 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 14:14:29,126 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 [2020-08-21 14:14:29,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 14:14:29,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 14:14:29,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 14:14:29,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 14:14:29,133 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-21 14:14:29,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:29,134 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 14:14:29,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:14:29,134 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 14:14:29,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 14:14:29,135 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:29,135 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] [2020-08-21 14:14:29,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:14:29,136 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:29,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:29,137 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-21 14:14:29,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:29,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136360735] [2020-08-21 14:14:29,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:29,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:29,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:29,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136360735] [2020-08-21 14:14:29,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:29,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:14:29,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469645558] [2020-08-21 14:14:29,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:14:29,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:29,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:14:29,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:14:29,663 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-21 14:14:30,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:30,221 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 14:14:30,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 14:14:30,223 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-21 14:14:30,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:30,226 INFO L225 Difference]: With dead ends: 50 [2020-08-21 14:14:30,226 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 14:14:30,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:30,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 14:14:30,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-21 14:14:30,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 14:14:30,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 14:14:30,254 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-21 14:14:30,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:30,256 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 14:14:30,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:14:30,257 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 14:14:30,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 14:14:30,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:30,260 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] [2020-08-21 14:14:30,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:14:30,260 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:30,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:30,262 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-21 14:14:30,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:30,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856139300] [2020-08-21 14:14:30,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:30,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:30,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:30,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856139300] [2020-08-21 14:14:30,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:30,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:14:30,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039301273] [2020-08-21 14:14:30,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:14:30,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:30,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:14:30,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:14:30,365 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-21 14:14:30,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:30,554 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-21 14:14:30,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:14:30,555 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-21 14:14:30,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:30,556 INFO L225 Difference]: With dead ends: 59 [2020-08-21 14:14:30,556 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 14:14:30,558 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 [2020-08-21 14:14:30,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 14:14:30,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-21 14:14:30,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 14:14:30,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 14:14:30,575 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-21 14:14:30,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:30,576 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 14:14:30,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:14:30,576 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 14:14:30,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 14:14:30,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:30,577 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] [2020-08-21 14:14:30,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:14:30,579 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:30,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:30,580 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-21 14:14:30,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:30,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133274582] [2020-08-21 14:14:30,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:30,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:31,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:31,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:31,049 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:31,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133274582] [2020-08-21 14:14:31,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:31,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 14:14:31,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871337295] [2020-08-21 14:14:31,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 14:14:31,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:31,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 14:14:31,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:14:31,052 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-21 14:14:31,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:31,965 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-21 14:14:31,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 14:14:31,966 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-21 14:14:31,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:31,969 INFO L225 Difference]: With dead ends: 70 [2020-08-21 14:14:31,969 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 14:14:31,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:14:31,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 14:14:31,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-21 14:14:31,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 14:14:31,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 14:14:31,995 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-21 14:14:31,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:31,996 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 14:14:31,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 14:14:31,996 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 14:14:31,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 14:14:31,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:31,999 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] [2020-08-21 14:14:31,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:14:32,000 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:32,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:32,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-21 14:14:32,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:32,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478103122] [2020-08-21 14:14:32,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:32,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:32,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,116 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:32,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478103122] [2020-08-21 14:14:32,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:32,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:14:32,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456899777] [2020-08-21 14:14:32,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:14:32,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:32,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:14:32,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:14:32,119 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 14:14:32,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:32,361 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-21 14:14:32,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:14:32,361 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 14:14:32,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:32,363 INFO L225 Difference]: With dead ends: 74 [2020-08-21 14:14:32,363 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 14:14:32,364 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 [2020-08-21 14:14:32,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 14:14:32,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-21 14:14:32,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 14:14:32,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 14:14:32,373 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-21 14:14:32,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:32,374 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 14:14:32,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:14:32,374 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 14:14:32,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 14:14:32,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:32,375 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] [2020-08-21 14:14:32,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:14:32,376 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:32,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:32,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-21 14:14:32,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:32,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192147292] [2020-08-21 14:14:32,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:32,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:32,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 14:14:32,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,443 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:14:32,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192147292] [2020-08-21 14:14:32,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:32,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:14:32,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941788702] [2020-08-21 14:14:32,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:14:32,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:32,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:14:32,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:14:32,446 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-21 14:14:32,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:32,585 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-21 14:14:32,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:14:32,589 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-21 14:14:32,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:32,590 INFO L225 Difference]: With dead ends: 75 [2020-08-21 14:14:32,591 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 14:14:32,591 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 [2020-08-21 14:14:32,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 14:14:32,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-21 14:14:32,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 14:14:32,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-21 14:14:32,600 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-21 14:14:32,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:32,600 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-21 14:14:32,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:14:32,601 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-21 14:14:32,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 14:14:32,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:32,602 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] [2020-08-21 14:14:32,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:14:32,602 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:32,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:32,603 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-21 14:14:32,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:32,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585770117] [2020-08-21 14:14:32,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:32,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:33,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,009 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:33,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585770117] [2020-08-21 14:14:33,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:33,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 14:14:33,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733267687] [2020-08-21 14:14:33,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 14:14:33,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:33,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 14:14:33,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:14:33,016 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-21 14:14:34,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:34,512 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-21 14:14:34,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 14:14:34,512 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-21 14:14:34,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:34,517 INFO L225 Difference]: With dead ends: 97 [2020-08-21 14:14:34,517 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 14:14:34,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:14:34,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 14:14:34,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-21 14:14:34,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 14:14:34,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-21 14:14:34,539 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-21 14:14:34,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:34,539 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-21 14:14:34,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 14:14:34,542 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-21 14:14:34,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 14:14:34,543 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:34,543 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] [2020-08-21 14:14:34,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:14:34,544 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:34,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:34,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-21 14:14:34,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:34,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000089619] [2020-08-21 14:14:34,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:34,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:34,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:34,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:34,611 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:34,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000089619] [2020-08-21 14:14:34,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:34,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:14:34,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194372398] [2020-08-21 14:14:34,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:14:34,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:34,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:14:34,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:14:34,614 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-21 14:14:34,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:34,878 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-21 14:14:34,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 14:14:34,879 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 14:14:34,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:34,880 INFO L225 Difference]: With dead ends: 88 [2020-08-21 14:14:34,880 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 14:14:34,884 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 [2020-08-21 14:14:34,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 14:14:34,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-21 14:14:34,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 14:14:34,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-21 14:14:34,901 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-21 14:14:34,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:34,903 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-21 14:14:34,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:14:34,903 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-21 14:14:34,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 14:14:34,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:34,906 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] [2020-08-21 14:14:34,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:14:34,906 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:34,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:34,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-21 14:14:34,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:34,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923221576] [2020-08-21 14:14:34,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 14:14:34,943 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 14:14:34,943 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 14:14:34,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:14:34,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 02:14:34 BoogieIcfgContainer [2020-08-21 14:14:34,972 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 14:14:34,975 INFO L168 Benchmark]: Toolchain (without parser) took 7612.95 ms. Allocated memory was 138.9 MB in the beginning and 309.9 MB in the end (delta: 170.9 MB). Free memory was 102.2 MB in the beginning and 247.8 MB in the end (delta: -145.6 MB). Peak memory consumption was 25.3 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:34,977 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-21 14:14:34,977 INFO L168 Benchmark]: CACSL2BoogieTranslator took 264.28 ms. Allocated memory is still 138.9 MB. Free memory was 101.8 MB in the beginning and 91.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:34,980 INFO L168 Benchmark]: Boogie Preprocessor took 113.96 ms. Allocated memory was 138.9 MB in the beginning and 200.8 MB in the end (delta: 61.9 MB). Free memory was 91.1 MB in the beginning and 178.5 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:34,983 INFO L168 Benchmark]: RCFGBuilder took 355.04 ms. Allocated memory is still 200.8 MB. Free memory was 178.5 MB in the beginning and 161.9 MB in the end (delta: 16.6 MB). Peak memory consumption was 16.6 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:34,984 INFO L168 Benchmark]: TraceAbstraction took 6867.50 ms. Allocated memory was 200.8 MB in the beginning and 309.9 MB in the end (delta: 109.1 MB). Free memory was 161.3 MB in the beginning and 247.8 MB in the end (delta: -86.6 MB). Peak memory consumption was 22.5 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:34,994 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 264.28 ms. Allocated memory is still 138.9 MB. Free memory was 101.8 MB in the beginning and 91.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.96 ms. Allocated memory was 138.9 MB in the beginning and 200.8 MB in the end (delta: 61.9 MB). Free memory was 91.1 MB in the beginning and 178.5 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 355.04 ms. Allocated memory is still 200.8 MB. Free memory was 178.5 MB in the beginning and 161.9 MB in the end (delta: 16.6 MB). Peak memory consumption was 16.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6867.50 ms. Allocated memory was 200.8 MB in the beginning and 309.9 MB in the end (delta: 109.1 MB). Free memory was 161.3 MB in the beginning and 247.8 MB in the end (delta: -86.6 MB). Peak memory consumption was 22.5 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