/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --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 20:41:01,084 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:41:01,088 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:41:01,131 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:41:01,131 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:41:01,142 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:41:01,147 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:41:01,149 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:41:01,151 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:41:01,154 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:41:01,155 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:41:01,156 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:41:01,156 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:41:01,159 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:41:01,160 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:41:01,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:41:01,164 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:41:01,165 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:41:01,170 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:41:01,172 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:41:01,177 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:41:01,178 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:41:01,180 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:41:01,181 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:41:01,189 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:41:01,200 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:41:01,201 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:41:01,202 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:41:01,203 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 20:41:01,249 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:41:01,249 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:41:01,251 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:41:01,251 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:41:01,251 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:41:01,251 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:41:01,251 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:41:01,252 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:41:01,252 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:41:01,252 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:41:01,253 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:41:01,253 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:41:01,253 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:41:01,254 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:41:01,254 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:41:01,254 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:41:01,254 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:41:01,255 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:41:01,255 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:41:01,255 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:41:01,255 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:41:01,255 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:01,256 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:41:01,256 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:41:01,256 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:41:01,256 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:41:01,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:41:01,257 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:41:01,257 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:41:01,257 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=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:41:01,548 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:41:01,568 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:41:01,573 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:41:01,575 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:41:01,576 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:41:01,577 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 20:41:01,646 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a6a19eb64/b787ce405ad14a68b5f4790a87ec5c4a/FLAGacf987098 [2020-08-21 20:41:02,073 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:41:02,075 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 20:41:02,082 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a6a19eb64/b787ce405ad14a68b5f4790a87ec5c4a/FLAGacf987098 [2020-08-21 20:41:02,450 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a6a19eb64/b787ce405ad14a68b5f4790a87ec5c4a [2020-08-21 20:41:02,459 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:41:02,460 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:41:02,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:02,462 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:41:02,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:41:02,466 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,470 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5dadf5b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02, skipping insertion in model container [2020-08-21 20:41:02,470 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,478 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:41:02,498 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:41:02,741 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:02,745 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:41:02,785 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:02,894 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:41:02,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02 WrapperNode [2020-08-21 20:41:02,896 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:02,900 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:41:02,900 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:41:02,900 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:41:02,915 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,917 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,934 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,934 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,957 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,963 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,970 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (1/1) ... [2020-08-21 20:41:02,972 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:41:02,973 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:41:02,973 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:41:02,973 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:41:02,975 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (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 20:41:03,049 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:41:03,049 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:41:03,049 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:41:03,050 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:41:03,050 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:41:03,050 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 20:41:03,051 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:41:03,051 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 20:41:03,051 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 20:41:03,052 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:41:03,052 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 20:41:03,052 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 20:41:03,052 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 20:41:03,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 20:41:03,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:41:03,054 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:41:03,419 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:41:03,420 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 20:41:03,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:03 BoogieIcfgContainer [2020-08-21 20:41:03,424 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:41:03,425 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:41:03,425 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:41:03,428 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:41:03,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:41:02" (1/3) ... [2020-08-21 20:41:03,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39f0554a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:03, skipping insertion in model container [2020-08-21 20:41:03,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:02" (2/3) ... [2020-08-21 20:41:03,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39f0554a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:03, skipping insertion in model container [2020-08-21 20:41:03,430 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:03" (3/3) ... [2020-08-21 20:41:03,431 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-21 20:41:03,442 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:41:03,448 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:41:03,460 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:41:03,485 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:41:03,485 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:41:03,486 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:41:03,486 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:41:03,486 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:41:03,486 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:41:03,486 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:41:03,487 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:41:03,513 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-21 20:41:03,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 20:41:03,521 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:03,522 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 20:41:03,523 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:03,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:03,529 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-21 20:41:03,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:03,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836251282] [2020-08-21 20:41:03,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:03,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:03,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:03,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:03,715 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 20:41:03,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836251282] [2020-08-21 20:41:03,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:03,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:41:03,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190907058] [2020-08-21 20:41:03,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:41:03,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:03,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:41:03,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:03,744 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-21 20:41:03,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:03,851 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-21 20:41:03,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:41:03,853 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 20:41:03,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:03,862 INFO L225 Difference]: With dead ends: 51 [2020-08-21 20:41:03,863 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 20:41:03,867 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 20:41:03,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 20:41:03,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 20:41:03,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 20:41:03,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 20:41:03,908 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-21 20:41:03,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:03,909 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 20:41:03,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:41:03,910 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 20:41:03,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 20:41:03,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:03,911 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 20:41:03,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:41:03,912 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:03,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:03,912 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-21 20:41:03,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:03,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921960127] [2020-08-21 20:41:03,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:03,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:04,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,020 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 20:41:04,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921960127] [2020-08-21 20:41:04,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:04,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:41:04,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804034045] [2020-08-21 20:41:04,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:41:04,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:04,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:41:04,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:04,025 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-21 20:41:04,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:04,143 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-21 20:41:04,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:41:04,144 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 20:41:04,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:04,146 INFO L225 Difference]: With dead ends: 44 [2020-08-21 20:41:04,147 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:41:04,148 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 20:41:04,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:41:04,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-21 20:41:04,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 20:41:04,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-21 20:41:04,161 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-21 20:41:04,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:04,161 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-21 20:41:04,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:41:04,161 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-21 20:41:04,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 20:41:04,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:04,163 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 20:41:04,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:41:04,163 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:04,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:04,164 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-21 20:41:04,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:04,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018480205] [2020-08-21 20:41:04,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:04,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:04,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,263 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 20:41:04,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018480205] [2020-08-21 20:41:04,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:04,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:41:04,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164442908] [2020-08-21 20:41:04,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:41:04,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:04,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:41:04,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:04,266 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-21 20:41:04,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:04,374 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-21 20:41:04,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:41:04,374 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 20:41:04,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:04,376 INFO L225 Difference]: With dead ends: 37 [2020-08-21 20:41:04,376 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 20:41:04,377 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 20:41:04,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 20:41:04,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 20:41:04,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 20:41:04,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 20:41:04,385 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-21 20:41:04,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:04,385 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 20:41:04,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:41:04,385 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 20:41:04,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 20:41:04,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:04,387 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 20:41:04,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:41:04,387 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:04,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:04,388 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-21 20:41:04,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:04,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981055885] [2020-08-21 20:41:04,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:04,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:04,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,883 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 20:41:04,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981055885] [2020-08-21 20:41:04,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:04,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:41:04,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328556092] [2020-08-21 20:41:04,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:41:04,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:04,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:41:04,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:41:04,886 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-21 20:41:05,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:05,477 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 20:41:05,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:41:05,478 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-21 20:41:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:05,479 INFO L225 Difference]: With dead ends: 50 [2020-08-21 20:41:05,480 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 20:41:05,481 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 [2020-08-21 20:41:05,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 20:41:05,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-21 20:41:05,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:41:05,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 20:41:05,492 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-21 20:41:05,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:05,492 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 20:41:05,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:41:05,493 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 20:41:05,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 20:41:05,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:05,494 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 20:41:05,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:41:05,495 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:05,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:05,495 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-21 20:41:05,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:05,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951620988] [2020-08-21 20:41:05,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:05,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:05,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:05,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:05,612 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 20:41:05,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951620988] [2020-08-21 20:41:05,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:05,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:41:05,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044419633] [2020-08-21 20:41:05,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:41:05,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:05,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:41:05,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:41:05,614 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-21 20:41:05,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:05,782 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-21 20:41:05,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:41:05,783 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-21 20:41:05,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:05,784 INFO L225 Difference]: With dead ends: 59 [2020-08-21 20:41:05,784 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 20:41:05,785 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 20:41:05,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 20:41:05,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-21 20:41:05,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 20:41:05,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 20:41:05,793 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-21 20:41:05,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:05,794 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 20:41:05,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:41:05,794 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 20:41:05,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 20:41:05,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:05,795 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 20:41:05,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:41:05,796 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:05,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:05,796 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-21 20:41:05,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:05,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228018613] [2020-08-21 20:41:05,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:05,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:06,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:06,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:06,209 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 20:41:06,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228018613] [2020-08-21 20:41:06,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:06,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:41:06,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928656270] [2020-08-21 20:41:06,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:41:06,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:06,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:41:06,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:41:06,219 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-21 20:41:07,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:07,176 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-21 20:41:07,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:41:07,177 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-21 20:41:07,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:07,180 INFO L225 Difference]: With dead ends: 70 [2020-08-21 20:41:07,180 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 20:41:07,181 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 20:41:07,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 20:41:07,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-21 20:41:07,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 20:41:07,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 20:41:07,191 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-21 20:41:07,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:07,191 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 20:41:07,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:41:07,192 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 20:41:07,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 20:41:07,193 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:07,193 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 20:41:07,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:41:07,193 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:07,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:07,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-21 20:41:07,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:07,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142042178] [2020-08-21 20:41:07,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:07,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:07,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,297 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 20:41:07,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142042178] [2020-08-21 20:41:07,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:07,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:41:07,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78538166] [2020-08-21 20:41:07,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:41:07,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:07,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:41:07,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:07,299 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 20:41:07,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:07,538 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-21 20:41:07,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:41:07,539 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 20:41:07,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:07,541 INFO L225 Difference]: With dead ends: 74 [2020-08-21 20:41:07,541 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 20:41:07,542 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 20:41:07,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 20:41:07,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-21 20:41:07,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 20:41:07,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 20:41:07,552 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-21 20:41:07,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:07,553 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 20:41:07,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:41:07,553 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 20:41:07,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 20:41:07,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:07,554 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 20:41:07,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:41:07,555 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:07,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:07,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-21 20:41:07,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:07,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562457229] [2020-08-21 20:41:07,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:07,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:07,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 20:41:07,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,642 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 20:41:07,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562457229] [2020-08-21 20:41:07,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:07,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:41:07,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860455167] [2020-08-21 20:41:07,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:41:07,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:07,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:41:07,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:07,645 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-21 20:41:07,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:07,797 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-21 20:41:07,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:41:07,798 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-21 20:41:07,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:07,799 INFO L225 Difference]: With dead ends: 75 [2020-08-21 20:41:07,799 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 20:41:07,800 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 20:41:07,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 20:41:07,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-21 20:41:07,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 20:41:07,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-21 20:41:07,809 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-21 20:41:07,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:07,810 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-21 20:41:07,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:41:07,810 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-21 20:41:07,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 20:41:07,811 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:07,811 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 20:41:07,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:41:07,812 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:07,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:07,812 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-21 20:41:07,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:07,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713632884] [2020-08-21 20:41:07,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:07,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:08,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:08,217 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 20:41:08,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713632884] [2020-08-21 20:41:08,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:08,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:41:08,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800125131] [2020-08-21 20:41:08,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:41:08,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:08,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:41:08,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:41:08,220 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-21 20:41:09,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:09,822 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-21 20:41:09,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 20:41:09,827 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-21 20:41:09,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:09,828 INFO L225 Difference]: With dead ends: 97 [2020-08-21 20:41:09,828 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 20:41:09,830 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 20:41:09,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 20:41:09,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-21 20:41:09,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 20:41:09,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-21 20:41:09,852 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-21 20:41:09,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:09,853 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-21 20:41:09,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:41:09,853 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-21 20:41:09,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 20:41:09,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:09,857 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 20:41:09,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:41:09,858 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:09,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:09,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-21 20:41:09,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:09,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138723993] [2020-08-21 20:41:09,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:09,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:09,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:09,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:09,976 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 20:41:09,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138723993] [2020-08-21 20:41:09,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:09,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:41:09,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114578425] [2020-08-21 20:41:09,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:41:09,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:09,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:41:09,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:41:09,979 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-21 20:41:10,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:10,256 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-21 20:41:10,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:41:10,256 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 20:41:10,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:10,257 INFO L225 Difference]: With dead ends: 88 [2020-08-21 20:41:10,257 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 20:41:10,258 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 20:41:10,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 20:41:10,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-21 20:41:10,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 20:41:10,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-21 20:41:10,269 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-21 20:41:10,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:10,270 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-21 20:41:10,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:41:10,270 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-21 20:41:10,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 20:41:10,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:10,275 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 20:41:10,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:41:10,275 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:10,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:10,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-21 20:41:10,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:10,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732839611] [2020-08-21 20:41:10,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:10,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 20:41:10,324 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 20:41:10,324 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 20:41:10,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:41:10,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 08:41:10 BoogieIcfgContainer [2020-08-21 20:41:10,355 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 20:41:10,358 INFO L168 Benchmark]: Toolchain (without parser) took 7896.40 ms. Allocated memory was 141.6 MB in the beginning and 285.7 MB in the end (delta: 144.2 MB). Free memory was 103.3 MB in the beginning and 137.2 MB in the end (delta: -33.9 MB). Peak memory consumption was 110.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:10,360 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 141.6 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 20:41:10,365 INFO L168 Benchmark]: CACSL2BoogieTranslator took 435.24 ms. Allocated memory was 141.6 MB in the beginning and 203.9 MB in the end (delta: 62.4 MB). Free memory was 102.9 MB in the beginning and 183.0 MB in the end (delta: -80.1 MB). Peak memory consumption was 22.0 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:10,366 INFO L168 Benchmark]: Boogie Preprocessor took 73.14 ms. Allocated memory is still 203.9 MB. Free memory was 183.0 MB in the beginning and 180.7 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:10,367 INFO L168 Benchmark]: RCFGBuilder took 450.95 ms. Allocated memory is still 203.9 MB. Free memory was 180.7 MB in the beginning and 164.3 MB in the end (delta: 16.4 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:10,368 INFO L168 Benchmark]: TraceAbstraction took 6929.49 ms. Allocated memory was 203.9 MB in the beginning and 285.7 MB in the end (delta: 81.8 MB). Free memory was 164.3 MB in the beginning and 137.2 MB in the end (delta: 27.1 MB). Peak memory consumption was 108.9 MB. Max. memory is 7.1 GB. [2020-08-21 20:41:10,381 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 141.6 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 435.24 ms. Allocated memory was 141.6 MB in the beginning and 203.9 MB in the end (delta: 62.4 MB). Free memory was 102.9 MB in the beginning and 183.0 MB in the end (delta: -80.1 MB). Peak memory consumption was 22.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 73.14 ms. Allocated memory is still 203.9 MB. Free memory was 183.0 MB in the beginning and 180.7 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 450.95 ms. Allocated memory is still 203.9 MB. Free memory was 180.7 MB in the beginning and 164.3 MB in the end (delta: 16.4 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6929.49 ms. Allocated memory was 203.9 MB in the beginning and 285.7 MB in the end (delta: 81.8 MB). Free memory was 164.3 MB in the beginning and 137.2 MB in the end (delta: 27.1 MB). Peak memory consumption was 108.9 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