/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 produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 11:31:33,061 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 11:31:33,067 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 11:31:33,109 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 11:31:33,110 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 11:31:33,121 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 11:31:33,124 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 11:31:33,128 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 11:31:33,131 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 11:31:33,135 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 11:31:33,136 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 11:31:33,137 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 11:31:33,137 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 11:31:33,141 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 11:31:33,144 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 11:31:33,145 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 11:31:33,147 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 11:31:33,148 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 11:31:33,150 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 11:31:33,161 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 11:31:33,163 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 11:31:33,164 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 11:31:33,165 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 11:31:33,166 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 11:31:33,169 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 11:31:33,169 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 11:31:33,170 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 11:31:33,173 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 11:31:33,174 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 11:31:33,175 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 11:31:33,175 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 11:31:33,176 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 11:31:33,177 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 11:31:33,178 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 11:31:33,179 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 11:31:33,180 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 11:31:33,180 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 11:31:33,181 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 11:31:33,181 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 11:31:33,182 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 11:31:33,184 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 11:31:33,185 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 [2020-09-21 11:31:33,232 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 11:31:33,232 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 11:31:33,234 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 11:31:33,234 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 11:31:33,234 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 11:31:33,235 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 11:31:33,235 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 11:31:33,235 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 11:31:33,235 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 11:31:33,235 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 11:31:33,236 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 11:31:33,236 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 11:31:33,236 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 11:31:33,236 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 11:31:33,236 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 11:31:33,237 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 11:31:33,237 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 11:31:33,237 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 11:31:33,237 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 11:31:33,237 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 11:31:33,238 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 11:31:33,238 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 11:31:33,238 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 11:31:33,238 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 11:31:33,238 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 11:31:33,239 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 11:31:33,239 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 11:31:33,239 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 11:31:33,239 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 11:31:33,239 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 -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; [2020-09-21 11:31:33,692 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 11:31:33,716 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 11:31:33,723 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 11:31:33,725 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 11:31:33,725 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 11:31:33,726 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-21 11:31:33,816 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0cad471b9/46f3c75f99e54465974f254027de7280/FLAG6c60d95e0 [2020-09-21 11:31:34,362 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 11:31:34,363 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-21 11:31:34,372 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0cad471b9/46f3c75f99e54465974f254027de7280/FLAG6c60d95e0 [2020-09-21 11:31:34,720 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0cad471b9/46f3c75f99e54465974f254027de7280 [2020-09-21 11:31:34,737 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 11:31:34,744 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 11:31:34,745 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 11:31:34,745 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 11:31:34,750 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 11:31:34,752 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:31:34" (1/1) ... [2020-09-21 11:31:34,758 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e48a7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:34, skipping insertion in model container [2020-09-21 11:31:34,758 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:31:34" (1/1) ... [2020-09-21 11:31:34,768 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 11:31:34,799 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 11:31:35,018 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:31:35,024 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 11:31:35,044 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:31:35,063 INFO L208 MainTranslator]: Completed translation [2020-09-21 11:31:35,064 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35 WrapperNode [2020-09-21 11:31:35,064 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 11:31:35,065 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 11:31:35,065 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 11:31:35,065 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 11:31:35,079 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,080 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,087 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,087 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,182 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,189 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,190 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (1/1) ... [2020-09-21 11:31:35,192 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 11:31:35,192 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 11:31:35,192 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 11:31:35,193 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 11:31:35,194 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (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 [2020-09-21 11:31:35,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 11:31:35,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 11:31:35,267 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 11:31:35,267 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 11:31:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 11:31:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 11:31:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 11:31:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 11:31:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 11:31:35,463 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 11:31:35,463 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-21 11:31:35,468 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:31:35 BoogieIcfgContainer [2020-09-21 11:31:35,468 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 11:31:35,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 11:31:35,469 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 11:31:35,473 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 11:31:35,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 11:31:34" (1/3) ... [2020-09-21 11:31:35,474 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a617728 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:31:35, skipping insertion in model container [2020-09-21 11:31:35,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:35" (2/3) ... [2020-09-21 11:31:35,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a617728 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:31:35, skipping insertion in model container [2020-09-21 11:31:35,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:31:35" (3/3) ... [2020-09-21 11:31:35,477 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-09-21 11:31:35,487 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 11:31:35,499 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 11:31:35,519 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 11:31:35,545 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 11:31:35,545 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 11:31:35,546 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 11:31:35,546 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 11:31:35,546 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 11:31:35,546 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 11:31:35,546 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 11:31:35,547 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 11:31:35,566 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-09-21 11:31:35,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 11:31:35,573 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:35,574 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:35,575 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:35,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:35,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-09-21 11:31:35,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:35,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168290450] [2020-09-21 11:31:35,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:35,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:35,748 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:35,748 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:35,748 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:35,749 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:35,749 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-09-21 11:31:35,749 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:35,749 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 25 [2020-09-21 11:31:35,750 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:35,750 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-21 11:31:35,750 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:31:35,750 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-09-21 11:31:35,750 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:35,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:35,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:35,854 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:35,855 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:35,855 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:35,855 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:35,856 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:31:35,856 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:35,856 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:35,856 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:35,857 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:35,857 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:35,857 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:35,857 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:35,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:35,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168290450] [2020-09-21 11:31:35,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:31:35,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 11:31:35,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102076600] [2020-09-21 11:31:35,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 11:31:35,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:35,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 11:31:35,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 11:31:35,912 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-09-21 11:31:36,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:36,010 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-09-21 11:31:36,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 11:31:36,022 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-09-21 11:31:36,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:36,035 INFO L225 Difference]: With dead ends: 29 [2020-09-21 11:31:36,036 INFO L226 Difference]: Without dead ends: 12 [2020-09-21 11:31:36,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 11:31:36,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-09-21 11:31:36,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-09-21 11:31:36,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-09-21 11:31:36,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-09-21 11:31:36,083 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-09-21 11:31:36,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:36,084 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-09-21 11:31:36,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 11:31:36,084 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-09-21 11:31:36,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-21 11:31:36,085 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:36,085 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:36,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 11:31:36,086 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:36,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:36,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-09-21 11:31:36,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:36,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198865997] [2020-09-21 11:31:36,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:36,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,128 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,129 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,129 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,129 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,130 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 20 [2020-09-21 11:31:36,130 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,130 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 24 [2020-09-21 11:31:36,130 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,131 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 11:31:36,131 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:31:36,131 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-09-21 11:31:36,132 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:36,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:36,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,240 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,241 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,241 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,241 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,242 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:31:36,242 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,242 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:36,243 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,243 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:36,243 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:36,243 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:36,244 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:36,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198865997] [2020-09-21 11:31:36,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:36,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 11:31:36,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239644624] [2020-09-21 11:31:36,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 11:31:36,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:36,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 11:31:36,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 11:31:36,252 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-09-21 11:31:36,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:36,275 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-09-21 11:31:36,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 11:31:36,276 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-09-21 11:31:36,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:36,277 INFO L225 Difference]: With dead ends: 18 [2020-09-21 11:31:36,278 INFO L226 Difference]: Without dead ends: 13 [2020-09-21 11:31:36,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 11:31:36,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-09-21 11:31:36,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-09-21 11:31:36,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-09-21 11:31:36,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-09-21 11:31:36,284 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-09-21 11:31:36,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:36,285 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-09-21 11:31:36,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 11:31:36,285 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-09-21 11:31:36,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 11:31:36,286 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:36,286 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:36,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 11:31:36,287 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:36,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:36,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-09-21 11:31:36,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:36,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102197569] [2020-09-21 11:31:36,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:36,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,329 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,329 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,330 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,330 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,330 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 21 [2020-09-21 11:31:36,330 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,331 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 24 [2020-09-21 11:31:36,331 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,331 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:31:36,331 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:31:36,332 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-09-21 11:31:36,332 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:36,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:36,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,442 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,442 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,443 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,443 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,443 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:31:36,444 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,444 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:36,444 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,444 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:36,445 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:36,445 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:36,445 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:36,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:36,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102197569] [2020-09-21 11:31:36,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:36,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 11:31:36,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110848608] [2020-09-21 11:31:36,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 11:31:36,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:36,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 11:31:36,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:31:36,452 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-09-21 11:31:36,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:36,476 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-09-21 11:31:36,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 11:31:36,476 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-09-21 11:31:36,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:36,477 INFO L225 Difference]: With dead ends: 19 [2020-09-21 11:31:36,477 INFO L226 Difference]: Without dead ends: 14 [2020-09-21 11:31:36,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:31:36,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-21 11:31:36,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-21 11:31:36,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-21 11:31:36,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-09-21 11:31:36,483 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-09-21 11:31:36,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:36,484 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-09-21 11:31:36,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 11:31:36,484 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-09-21 11:31:36,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-21 11:31:36,484 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:36,485 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:36,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 11:31:36,485 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:36,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:36,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-09-21 11:31:36,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:36,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988856331] [2020-09-21 11:31:36,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:36,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,589 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,589 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,590 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,590 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,590 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-09-21 11:31:36,591 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,591 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 86 [2020-09-21 11:31:36,591 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,591 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-21 11:31:36,591 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:31:36,592 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-09-21 11:31:36,592 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:36,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:36,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,698 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,698 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,699 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,699 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,699 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:31:36,700 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,700 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:36,700 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,700 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:36,701 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:36,701 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:36,701 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:36,704 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:36,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988856331] [2020-09-21 11:31:36,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:36,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 11:31:36,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840499552] [2020-09-21 11:31:36,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 11:31:36,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:36,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 11:31:36,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 11:31:36,708 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-09-21 11:31:36,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:36,742 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-09-21 11:31:36,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 11:31:36,743 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-09-21 11:31:36,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:36,743 INFO L225 Difference]: With dead ends: 20 [2020-09-21 11:31:36,744 INFO L226 Difference]: Without dead ends: 15 [2020-09-21 11:31:36,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 11:31:36,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-09-21 11:31:36,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-09-21 11:31:36,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 11:31:36,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-09-21 11:31:36,750 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-09-21 11:31:36,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:36,751 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-09-21 11:31:36,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 11:31:36,751 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-09-21 11:31:36,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 11:31:36,752 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:36,752 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:36,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 11:31:36,753 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:36,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:36,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-09-21 11:31:36,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:36,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190392619] [2020-09-21 11:31:36,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:36,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,855 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,856 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,856 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,857 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,857 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-09-21 11:31:36,857 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,857 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 87 [2020-09-21 11:31:36,860 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,860 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 11:31:36,860 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:31:36,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 11:31:36,861 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-09-21 11:31:36,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:36,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:36,995 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:36,997 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:36,997 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:36,997 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:36,998 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:31:36,998 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:36,998 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:36,998 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:36,999 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:36,999 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:36,999 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:36,999 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:37,003 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:37,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190392619] [2020-09-21 11:31:37,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:37,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 11:31:37,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443386093] [2020-09-21 11:31:37,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 11:31:37,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:37,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 11:31:37,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 11:31:37,008 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-09-21 11:31:37,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:37,064 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-09-21 11:31:37,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 11:31:37,065 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-09-21 11:31:37,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:37,066 INFO L225 Difference]: With dead ends: 21 [2020-09-21 11:31:37,066 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 11:31:37,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 11:31:37,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 11:31:37,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-21 11:31:37,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-21 11:31:37,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-21 11:31:37,079 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-09-21 11:31:37,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:37,079 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-21 11:31:37,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 11:31:37,079 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-21 11:31:37,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 11:31:37,080 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:37,080 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:37,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 11:31:37,081 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:37,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:37,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-09-21 11:31:37,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:37,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183922225] [2020-09-21 11:31:37,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:37,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:37,227 FATAL L256 erpolLogProxyWrapper]: Difference in size: 3 [2020-09-21 11:31:37,227 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:37,227 FATAL L256 erpolLogProxyWrapper]: Difference in width: 5 [2020-09-21 11:31:37,228 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:37,230 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-09-21 11:31:37,230 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:37,230 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 113 [2020-09-21 11:31:37,231 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:37,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-21 11:31:37,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:31:37,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:31:37,231 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:37,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:37,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:37,368 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:37,369 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:37,369 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:37,369 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:37,370 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:31:37,370 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:37,370 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:37,370 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:37,371 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:37,371 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:37,371 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:37,371 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:37,375 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:37,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183922225] [2020-09-21 11:31:37,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:37,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 11:31:37,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106635989] [2020-09-21 11:31:37,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 11:31:37,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:37,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 11:31:37,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 11:31:37,378 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-09-21 11:31:37,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:37,425 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-09-21 11:31:37,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 11:31:37,425 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-09-21 11:31:37,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:37,426 INFO L225 Difference]: With dead ends: 22 [2020-09-21 11:31:37,426 INFO L226 Difference]: Without dead ends: 17 [2020-09-21 11:31:37,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 11:31:37,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-09-21 11:31:37,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-09-21 11:31:37,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 11:31:37,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-21 11:31:37,432 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-09-21 11:31:37,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:37,433 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-21 11:31:37,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 11:31:37,433 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-21 11:31:37,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 11:31:37,434 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:37,434 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:37,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 11:31:37,434 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:37,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:37,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-09-21 11:31:37,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:37,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156862999] [2020-09-21 11:31:37,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:37,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 11:31:37,449 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 11:31:37,449 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 11:31:37,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 11:31:37,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 11:31:37 BoogieIcfgContainer [2020-09-21 11:31:37,474 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 11:31:37,478 INFO L168 Benchmark]: Toolchain (without parser) took 2736.90 ms. Allocated memory was 147.8 MB in the beginning and 235.9 MB in the end (delta: 88.1 MB). Free memory was 102.5 MB in the beginning and 164.5 MB in the end (delta: -62.0 MB). Peak memory consumption was 26.1 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:37,479 INFO L168 Benchmark]: CDTParser took 0.83 ms. Allocated memory is still 147.8 MB. Free memory was 121.1 MB in the beginning and 120.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 11:31:37,480 INFO L168 Benchmark]: CACSL2BoogieTranslator took 319.45 ms. Allocated memory is still 147.8 MB. Free memory was 101.9 MB in the beginning and 92.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:37,481 INFO L168 Benchmark]: Boogie Preprocessor took 127.02 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 92.5 MB in the beginning and 183.1 MB in the end (delta: -90.5 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:37,482 INFO L168 Benchmark]: RCFGBuilder took 275.64 ms. Allocated memory is still 203.9 MB. Free memory was 183.1 MB in the beginning and 171.8 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:37,482 INFO L168 Benchmark]: TraceAbstraction took 2005.03 ms. Allocated memory was 203.9 MB in the beginning and 235.9 MB in the end (delta: 32.0 MB). Free memory was 171.2 MB in the beginning and 164.5 MB in the end (delta: 6.7 MB). Peak memory consumption was 38.7 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:37,486 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.83 ms. Allocated memory is still 147.8 MB. Free memory was 121.1 MB in the beginning and 120.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 319.45 ms. Allocated memory is still 147.8 MB. Free memory was 101.9 MB in the beginning and 92.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 127.02 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 92.5 MB in the beginning and 183.1 MB in the end (delta: -90.5 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 275.64 ms. Allocated memory is still 203.9 MB. Free memory was 183.1 MB in the beginning and 171.8 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2005.03 ms. Allocated memory was 203.9 MB in the beginning and 235.9 MB in the end (delta: 32.0 MB). Free memory was 171.2 MB in the beginning and 164.5 MB in the end (delta: 6.7 MB). Peak memory consumption was 38.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(x != 6) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.9s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 166 SDs, 0 SdLazy, 97 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 2605 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/35 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...