/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:25:19,423 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:25:19,426 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:25:19,450 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:25:19,450 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:25:19,451 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:25:19,453 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:25:19,455 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:25:19,456 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:25:19,457 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:25:19,459 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:25:19,460 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:25:19,460 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:25:19,461 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:25:19,463 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:25:19,464 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:25:19,464 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:25:19,465 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:25:19,467 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:25:19,469 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:25:19,470 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:25:19,471 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:25:19,473 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:25:19,473 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:25:19,476 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 20:25:19,476 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 20:25:19,476 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 20:25:19,477 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 20:25:19,478 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 20:25:19,479 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 20:25:19,479 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 20:25:19,480 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 20:25:19,481 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 20:25:19,482 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 20:25:19,483 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 20:25:19,483 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 20:25:19,484 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 20:25:19,484 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 20:25:19,484 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:25:19,485 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:25:19,486 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:25:19,487 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 20:25:19,508 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:25:19,509 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:25:19,510 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:25:19,510 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:25:19,510 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:25:19,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:25:19,511 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:25:19,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:25:19,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:25:19,512 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:25:19,512 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:25:19,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:25:19,512 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:25:19,512 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:25:19,513 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:25:19,513 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:25:19,513 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:25:19,513 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:25:19,513 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:25:19,514 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:25:19,514 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:25:19,514 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:25:19,514 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:25:19,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:25:19,515 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:25:19,515 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:25:19,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:25:19,515 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:25:19,516 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:25:19,516 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:25:19,859 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:25:19,872 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:25:19,876 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:25:19,877 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:25:19,878 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:25:19,879 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-18 20:25:19,943 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/24fcf8d78/828668673cd4471fb37953b1aa84beaf/FLAG1571f1d2f [2020-08-18 20:25:20,415 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:25:20,415 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-18 20:25:20,422 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/24fcf8d78/828668673cd4471fb37953b1aa84beaf/FLAG1571f1d2f [2020-08-18 20:25:20,815 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/24fcf8d78/828668673cd4471fb37953b1aa84beaf [2020-08-18 20:25:20,825 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:25:20,827 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:25:20,828 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:20,829 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:25:20,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:25:20,833 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:20" (1/1) ... [2020-08-18 20:25:20,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62c9e9a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:20, skipping insertion in model container [2020-08-18 20:25:20,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:20" (1/1) ... [2020-08-18 20:25:20,844 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:25:20,862 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:25:21,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:21,076 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:25:21,101 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:21,120 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:25:21,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21 WrapperNode [2020-08-18 20:25:21,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:21,122 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:25:21,122 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:25:21,122 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:25:21,212 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,212 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,219 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,220 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,227 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,233 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,235 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... [2020-08-18 20:25:21,237 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:25:21,237 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:25:21,238 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:25:21,238 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:25:21,239 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:25:21,306 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:25:21,306 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:25:21,307 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:25:21,307 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:25:21,307 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:25:21,307 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 20:25:21,307 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:25:21,307 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 20:25:21,308 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-18 20:25:21,308 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:25:21,308 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 20:25:21,308 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 20:25:21,308 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 20:25:21,308 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 20:25:21,309 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:25:21,309 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:25:21,586 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:25:21,586 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 20:25:21,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:21 BoogieIcfgContainer [2020-08-18 20:25:21,591 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:25:21,593 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:25:21,593 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:25:21,597 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:25:21,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:25:20" (1/3) ... [2020-08-18 20:25:21,599 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@398aaa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:21, skipping insertion in model container [2020-08-18 20:25:21,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:21" (2/3) ... [2020-08-18 20:25:21,599 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@398aaa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:21, skipping insertion in model container [2020-08-18 20:25:21,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:21" (3/3) ... [2020-08-18 20:25:21,601 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-18 20:25:21,614 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:25:21,621 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:25:21,637 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:25:21,665 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:25:21,666 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:25:21,666 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:25:21,666 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:25:21,666 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:25:21,666 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:25:21,667 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:25:21,667 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:25:21,688 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-18 20:25:21,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 20:25:21,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:21,696 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:21,697 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:21,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:21,703 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-18 20:25:21,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:21,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710487836] [2020-08-18 20:25:21,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:21,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:21,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:21,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:21,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:21,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710487836] [2020-08-18 20:25:21,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:21,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:25:21,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704104955] [2020-08-18 20:25:22,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:25:22,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:22,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:25:22,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:22,021 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-18 20:25:22,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:22,138 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-18 20:25:22,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:25:22,140 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 20:25:22,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:22,148 INFO L225 Difference]: With dead ends: 51 [2020-08-18 20:25:22,148 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 20:25:22,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:22,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 20:25:22,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 20:25:22,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 20:25:22,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 20:25:22,193 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-18 20:25:22,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:22,193 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 20:25:22,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:25:22,194 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 20:25:22,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 20:25:22,195 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:22,195 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:22,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:25:22,195 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:22,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:22,196 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-18 20:25:22,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:22,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827357024] [2020-08-18 20:25:22,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:22,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:22,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:22,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:22,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827357024] [2020-08-18 20:25:22,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:22,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:25:22,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276261078] [2020-08-18 20:25:22,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:25:22,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:22,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:25:22,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:22,317 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-18 20:25:22,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:22,419 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-18 20:25:22,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:25:22,420 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 20:25:22,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:22,423 INFO L225 Difference]: With dead ends: 44 [2020-08-18 20:25:22,424 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:25:22,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:25:22,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:25:22,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-18 20:25:22,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 20:25:22,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-18 20:25:22,438 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-18 20:25:22,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:22,439 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-18 20:25:22,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:25:22,439 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-18 20:25:22,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 20:25:22,440 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:22,440 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:22,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:25:22,441 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:22,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:22,441 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-18 20:25:22,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:22,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525471129] [2020-08-18 20:25:22,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:22,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:22,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:22,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:22,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 20:25:22,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525471129] [2020-08-18 20:25:22,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:22,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:25:22,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704778848] [2020-08-18 20:25:22,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:25:22,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:22,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:25:22,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:22,543 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-18 20:25:22,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:22,673 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-18 20:25:22,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:25:22,673 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-18 20:25:22,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:22,674 INFO L225 Difference]: With dead ends: 37 [2020-08-18 20:25:22,676 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 20:25:22,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:22,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 20:25:22,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 20:25:22,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 20:25:22,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 20:25:22,690 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-18 20:25:22,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:22,691 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 20:25:22,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:25:22,692 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 20:25:22,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 20:25:22,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:22,693 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:22,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:25:22,694 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:22,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:22,695 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-18 20:25:22,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:22,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023474600] [2020-08-18 20:25:22,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:22,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:23,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:23,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:23,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:23,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023474600] [2020-08-18 20:25:23,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:23,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:25:23,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331177246] [2020-08-18 20:25:23,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:25:23,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:23,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:25:23,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:25:23,166 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-18 20:25:23,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:23,714 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 20:25:23,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:25:23,715 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-18 20:25:23,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:23,717 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:25:23,717 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 20:25:23,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:23,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 20:25:23,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-18 20:25:23,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:25:23,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 20:25:23,729 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-18 20:25:23,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:23,729 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 20:25:23,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:25:23,730 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 20:25:23,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 20:25:23,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:23,731 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:23,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:25:23,731 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:23,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:23,732 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-18 20:25:23,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:23,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141118658] [2020-08-18 20:25:23,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:23,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:23,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:23,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:23,829 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:23,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141118658] [2020-08-18 20:25:23,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:23,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:25:23,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674209334] [2020-08-18 20:25:23,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:25:23,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:23,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:25:23,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:23,833 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-18 20:25:24,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:24,032 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-18 20:25:24,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:25:24,033 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-18 20:25:24,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:24,034 INFO L225 Difference]: With dead ends: 59 [2020-08-18 20:25:24,034 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 20:25:24,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:24,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 20:25:24,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-18 20:25:24,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:25:24,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 20:25:24,044 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-18 20:25:24,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:24,044 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 20:25:24,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:25:24,044 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 20:25:24,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 20:25:24,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:24,046 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:24,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:25:24,046 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:24,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:24,047 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-18 20:25:24,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:24,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788794324] [2020-08-18 20:25:24,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:24,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:24,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,437 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:24,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788794324] [2020-08-18 20:25:24,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:24,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:25:24,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108736574] [2020-08-18 20:25:24,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:25:24,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:24,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:25:24,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:25:24,440 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-18 20:25:25,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:25,402 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-18 20:25:25,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:25:25,403 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-18 20:25:25,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:25,406 INFO L225 Difference]: With dead ends: 70 [2020-08-18 20:25:25,406 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 20:25:25,407 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 [2020-08-18 20:25:25,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 20:25:25,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-18 20:25:25,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 20:25:25,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-18 20:25:25,417 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-18 20:25:25,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:25,417 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-18 20:25:25,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:25:25,418 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-18 20:25:25,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 20:25:25,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:25,419 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:25,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:25:25,419 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:25,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:25,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-18 20:25:25,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:25,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585262903] [2020-08-18 20:25:25,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:25,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:25,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:25,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:25,482 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:25,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585262903] [2020-08-18 20:25:25,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:25,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:25:25,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353331899] [2020-08-18 20:25:25,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:25:25,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:25,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:25:25,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:25,484 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-18 20:25:25,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:25,694 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-18 20:25:25,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:25:25,694 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-18 20:25:25,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:25,696 INFO L225 Difference]: With dead ends: 74 [2020-08-18 20:25:25,696 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 20:25:25,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:25:25,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 20:25:25,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-18 20:25:25,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 20:25:25,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-18 20:25:25,705 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-18 20:25:25,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:25,706 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-18 20:25:25,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:25:25,706 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-18 20:25:25,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 20:25:25,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:25,707 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:25,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:25:25,708 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:25,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:25,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-18 20:25:25,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:25,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1886627697] [2020-08-18 20:25:25,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:25,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:25,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:25,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 20:25:25,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:25,772 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 20:25:25,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1886627697] [2020-08-18 20:25:25,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:25,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:25:25,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73348897] [2020-08-18 20:25:25,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:25:25,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:25,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:25:25,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:25,775 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-18 20:25:25,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:25,898 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-18 20:25:25,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:25:25,898 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-18 20:25:25,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:25,899 INFO L225 Difference]: With dead ends: 75 [2020-08-18 20:25:25,900 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 20:25:25,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:25,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 20:25:25,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-18 20:25:25,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 20:25:25,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-18 20:25:25,909 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-18 20:25:25,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:25,909 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-18 20:25:25,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:25:25,910 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-18 20:25:25,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 20:25:25,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:25,911 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:25,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:25:25,911 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:25,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:25,912 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-18 20:25:25,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:25,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71598838] [2020-08-18 20:25:25,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:25,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:26,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:26,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:26,383 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:26,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71598838] [2020-08-18 20:25:26,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:26,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:25:26,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482980479] [2020-08-18 20:25:26,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:25:26,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:26,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:25:26,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:25:26,386 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-18 20:25:28,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:28,040 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-18 20:25:28,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 20:25:28,041 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-18 20:25:28,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:28,042 INFO L225 Difference]: With dead ends: 97 [2020-08-18 20:25:28,043 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 20:25:28,044 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 [2020-08-18 20:25:28,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 20:25:28,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-18 20:25:28,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 20:25:28,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-18 20:25:28,054 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-18 20:25:28,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:28,060 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-18 20:25:28,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:25:28,060 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-18 20:25:28,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:25:28,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:28,062 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:28,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:25:28,062 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:28,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:28,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-18 20:25:28,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:28,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769793639] [2020-08-18 20:25:28,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:28,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:28,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:28,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:28,156 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:28,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769793639] [2020-08-18 20:25:28,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:28,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:25:28,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890694057] [2020-08-18 20:25:28,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:25:28,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:28,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:25:28,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:25:28,159 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-18 20:25:28,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:28,398 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-18 20:25:28,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:25:28,399 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-18 20:25:28,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:28,400 INFO L225 Difference]: With dead ends: 88 [2020-08-18 20:25:28,400 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 20:25:28,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:25:28,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 20:25:28,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-18 20:25:28,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 20:25:28,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-18 20:25:28,411 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-18 20:25:28,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:28,411 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-18 20:25:28,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:25:28,412 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-18 20:25:28,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 20:25:28,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:28,413 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:28,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:25:28,413 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:28,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:28,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-18 20:25:28,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:28,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536287198] [2020-08-18 20:25:28,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:28,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 20:25:28,434 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 20:25:28,435 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 20:25:28,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:25:28,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 08:25:28 BoogieIcfgContainer [2020-08-18 20:25:28,462 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 20:25:28,466 INFO L168 Benchmark]: Toolchain (without parser) took 7637.57 ms. Allocated memory was 137.4 MB in the beginning and 297.8 MB in the end (delta: 160.4 MB). Free memory was 99.9 MB in the beginning and 106.8 MB in the end (delta: -6.9 MB). Peak memory consumption was 153.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:25:28,467 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.4 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-08-18 20:25:28,468 INFO L168 Benchmark]: CACSL2BoogieTranslator took 293.05 ms. Allocated memory is still 137.4 MB. Free memory was 99.9 MB in the beginning and 89.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:25:28,473 INFO L168 Benchmark]: Boogie Preprocessor took 115.37 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 89.4 MB in the beginning and 177.0 MB in the end (delta: -87.6 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-08-18 20:25:28,474 INFO L168 Benchmark]: RCFGBuilder took 354.22 ms. Allocated memory is still 199.8 MB. Free memory was 177.0 MB in the beginning and 160.5 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:25:28,475 INFO L168 Benchmark]: TraceAbstraction took 6869.75 ms. Allocated memory was 199.8 MB in the beginning and 297.8 MB in the end (delta: 98.0 MB). Free memory was 160.5 MB in the beginning and 106.8 MB in the end (delta: 53.7 MB). Peak memory consumption was 151.8 MB. Max. memory is 7.1 GB. [2020-08-18 20:25:28,486 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.4 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 293.05 ms. Allocated memory is still 137.4 MB. Free memory was 99.9 MB in the beginning and 89.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 115.37 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 89.4 MB in the beginning and 177.0 MB in the end (delta: -87.6 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 354.22 ms. Allocated memory is still 199.8 MB. Free memory was 177.0 MB in the beginning and 160.5 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6869.75 ms. Allocated memory was 199.8 MB in the beginning and 297.8 MB in the end (delta: 98.0 MB). Free memory was 160.5 MB in the beginning and 106.8 MB in the end (delta: 53.7 MB). Peak memory consumption was 151.8 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