/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/psyco/psyco_net_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-28 17:12:12,552 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-28 17:12:12,557 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-28 17:12:12,617 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-28 17:12:12,618 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-28 17:12:12,626 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-28 17:12:12,628 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-28 17:12:12,633 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-28 17:12:12,637 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-28 17:12:12,645 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-28 17:12:12,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-28 17:12:12,648 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-28 17:12:12,648 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-28 17:12:12,652 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-28 17:12:12,655 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-28 17:12:12,657 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-28 17:12:12,659 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-28 17:12:12,663 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-28 17:12:12,671 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-28 17:12:12,679 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-28 17:12:12,683 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-28 17:12:12,685 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-28 17:12:12,687 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-28 17:12:12,690 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-28 17:12:12,694 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-28 17:12:12,695 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-28 17:12:12,716 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-28 17:12:12,719 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-28 17:12:12,720 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-28 17:12:12,723 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-28 17:12:12,725 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-28 17:12:12,726 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-28 17:12:12,740 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-28 17:12:12,742 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-28 17:12:12,743 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-28 17:12:12,744 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-28 17:12:12,748 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-28 17:12:12,748 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-28 17:12:12,748 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-28 17:12:12,753 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-28 17:12:12,754 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-28 17:12:12,756 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 [2020-10-28 17:12:12,788 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-28 17:12:12,789 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-28 17:12:12,790 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-28 17:12:12,791 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-28 17:12:12,791 INFO L138 SettingsManager]: * Use SBE=true [2020-10-28 17:12:12,791 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-28 17:12:12,791 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-28 17:12:12,791 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-28 17:12:12,792 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-28 17:12:12,792 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-28 17:12:12,792 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-28 17:12:12,792 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-28 17:12:12,792 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-28 17:12:12,793 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-28 17:12:12,793 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-28 17:12:12,793 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-28 17:12:12,793 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-28 17:12:12,793 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-28 17:12:12,794 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-28 17:12:12,794 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-28 17:12:12,794 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-28 17:12:12,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-28 17:12:12,795 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-28 17:12:12,795 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-28 17:12:12,795 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-28 17:12:12,795 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-28 17:12:12,795 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-28 17:12:12,795 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-28 17:12:12,796 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-28 17:12:12,796 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true;unknown-allowed=true; [2020-10-28 17:12:13,209 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-28 17:12:13,238 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-28 17:12:13,241 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-28 17:12:13,243 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-28 17:12:13,243 INFO L275 PluginConnector]: CDTParser initialized [2020-10-28 17:12:13,244 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/psyco/psyco_net_1.c [2020-10-28 17:12:13,327 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8e8bf1f80/85ce316de9a0412cb865a072ffbf8234/FLAG061c81ece [2020-10-28 17:12:14,801 INFO L306 CDTParser]: Found 1 translation units. [2020-10-28 17:12:14,801 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/psyco/psyco_net_1.c [2020-10-28 17:12:14,938 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8e8bf1f80/85ce316de9a0412cb865a072ffbf8234/FLAG061c81ece [2020-10-28 17:12:15,252 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8e8bf1f80/85ce316de9a0412cb865a072ffbf8234 [2020-10-28 17:12:15,256 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-28 17:12:15,264 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-28 17:12:15,268 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-28 17:12:15,268 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-28 17:12:15,272 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-28 17:12:15,273 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 05:12:15" (1/1) ... [2020-10-28 17:12:15,279 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@284be0b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:15, skipping insertion in model container [2020-10-28 17:12:15,279 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 05:12:15" (1/1) ... [2020-10-28 17:12:15,288 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-28 17:12:15,790 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-28 17:12:17,719 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 17:12:17,790 INFO L203 MainTranslator]: Completed pre-run [2020-10-28 17:12:19,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 17:12:19,059 INFO L208 MainTranslator]: Completed translation [2020-10-28 17:12:19,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19 WrapperNode [2020-10-28 17:12:19,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-28 17:12:19,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-28 17:12:19,062 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-28 17:12:19,062 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-28 17:12:19,076 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:19,078 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:19,337 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:19,337 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:19,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:20,237 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:20,367 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (1/1) ... [2020-10-28 17:12:20,733 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-28 17:12:20,737 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-28 17:12:20,737 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-28 17:12:20,737 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-28 17:12:20,738 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (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 [2020-10-28 17:12:20,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-28 17:12:20,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-28 17:12:20,811 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-28 17:12:20,812 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-28 17:12:20,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-28 17:12:20,812 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-28 17:12:20,812 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-28 17:12:20,812 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-28 17:12:20,812 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-28 17:12:20,812 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-28 17:12:20,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-28 17:12:20,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-28 17:12:20,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-28 17:12:20,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-28 17:12:20,813 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-28 17:12:20,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-28 17:12:40,843 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-28 17:12:40,844 INFO L298 CfgBuilder]: Removed 1130 assume(true) statements. [2020-10-28 17:12:40,855 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 05:12:40 BoogieIcfgContainer [2020-10-28 17:12:40,855 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-28 17:12:40,857 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-28 17:12:40,857 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-28 17:12:40,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-28 17:12:40,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 05:12:15" (1/3) ... [2020-10-28 17:12:40,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ddc4d92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 05:12:40, skipping insertion in model container [2020-10-28 17:12:40,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:12:19" (2/3) ... [2020-10-28 17:12:40,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ddc4d92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 05:12:40, skipping insertion in model container [2020-10-28 17:12:40,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 05:12:40" (3/3) ... [2020-10-28 17:12:40,864 INFO L111 eAbstractionObserver]: Analyzing ICFG psyco_net_1.c [2020-10-28 17:12:40,876 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-28 17:12:40,885 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-28 17:12:40,899 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-28 17:12:40,953 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-28 17:12:40,953 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-28 17:12:40,953 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-28 17:12:40,953 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-28 17:12:40,954 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-28 17:12:40,954 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-28 17:12:40,954 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-28 17:12:40,954 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-28 17:12:41,081 INFO L276 IsEmpty]: Start isEmpty. Operand 9220 states. [2020-10-28 17:12:41,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-28 17:12:41,087 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:12:41,088 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:12:41,088 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:12:41,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:12:41,095 INFO L82 PathProgramCache]: Analyzing trace with hash -782733704, now seen corresponding path program 1 times [2020-10-28 17:12:41,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:12:41,105 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684556659] [2020-10-28 17:12:41,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:12:41,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:41,407 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:41,633 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:41,634 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-28 17:12:41,634 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:41,634 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 304 [2020-10-28 17:12:41,642 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:41,642 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:41,643 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:12:41,643 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-28 17:12:41,643 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:12:41,643 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 8 [2020-10-28 17:12:42,001 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:12:42,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:12:42,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:42,024 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:42,053 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:42,054 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:12:42,054 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:42,054 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 33 [2020-10-28 17:12:42,054 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:42,055 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:42,055 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:12:42,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:42,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:12:42,056 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:42,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:12:42,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684556659] [2020-10-28 17:12:42,080 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:12:42,081 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-28 17:12:42,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930152384] [2020-10-28 17:12:42,087 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-28 17:12:42,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:12:42,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-28 17:12:42,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-28 17:12:42,109 INFO L87 Difference]: Start difference. First operand 9220 states. Second operand 3 states. [2020-10-28 17:12:42,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:12:42,851 INFO L93 Difference]: Finished difference Result 17709 states and 35392 transitions. [2020-10-28 17:12:42,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-28 17:12:42,853 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-10-28 17:12:42,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:12:42,930 INFO L225 Difference]: With dead ends: 17709 [2020-10-28 17:12:42,930 INFO L226 Difference]: Without dead ends: 8285 [2020-10-28 17:12:42,961 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-28 17:12:43,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8285 states. [2020-10-28 17:12:43,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8285 to 8285. [2020-10-28 17:12:43,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8285 states. [2020-10-28 17:12:43,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8285 states to 8285 states and 13002 transitions. [2020-10-28 17:12:43,294 INFO L78 Accepts]: Start accepts. Automaton has 8285 states and 13002 transitions. Word has length 14 [2020-10-28 17:12:43,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:12:43,295 INFO L481 AbstractCegarLoop]: Abstraction has 8285 states and 13002 transitions. [2020-10-28 17:12:43,295 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-28 17:12:43,295 INFO L276 IsEmpty]: Start isEmpty. Operand 8285 states and 13002 transitions. [2020-10-28 17:12:43,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-28 17:12:43,297 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:12:43,297 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:12:43,298 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-28 17:12:43,299 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:12:43,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:12:43,300 INFO L82 PathProgramCache]: Analyzing trace with hash 788089820, now seen corresponding path program 1 times [2020-10-28 17:12:43,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:12:43,301 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894949236] [2020-10-28 17:12:43,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:12:43,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:43,407 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:43,472 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:43,668 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:43,668 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-28 17:12:43,668 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 17:12:43,668 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 299 [2020-10-28 17:12:43,669 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:43,670 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:43,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:12:43,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-28 17:12:43,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-28 17:12:43,670 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:43,951 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:12:43,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:12:43,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:12:43,963 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:12:43,978 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:12:43,979 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:12:43,979 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:12:43,979 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 18 [2020-10-28 17:12:43,980 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:12:43,980 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:12:43,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:12:43,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:12:43,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:12:43,981 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:12:43,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:12:43,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894949236] [2020-10-28 17:12:43,993 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:12:43,993 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 17:12:43,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82194729] [2020-10-28 17:12:43,995 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 17:12:43,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:12:43,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 17:12:43,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 17:12:43,996 INFO L87 Difference]: Start difference. First operand 8285 states and 13002 transitions. Second operand 4 states. [2020-10-28 17:12:44,249 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-10-28 17:13:36,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:13:36,776 INFO L93 Difference]: Finished difference Result 16608 states and 26084 transitions. [2020-10-28 17:13:36,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-28 17:13:36,780 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-10-28 17:13:36,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:13:36,827 INFO L225 Difference]: With dead ends: 16608 [2020-10-28 17:13:36,828 INFO L226 Difference]: Without dead ends: 8329 [2020-10-28 17:13:36,844 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-28 17:13:36,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8329 states. [2020-10-28 17:13:37,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8329 to 8329. [2020-10-28 17:13:37,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8329 states. [2020-10-28 17:13:37,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8329 states to 8329 states and 13047 transitions. [2020-10-28 17:13:37,057 INFO L78 Accepts]: Start accepts. Automaton has 8329 states and 13047 transitions. Word has length 15 [2020-10-28 17:13:37,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:13:37,058 INFO L481 AbstractCegarLoop]: Abstraction has 8329 states and 13047 transitions. [2020-10-28 17:13:37,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-28 17:13:37,059 INFO L276 IsEmpty]: Start isEmpty. Operand 8329 states and 13047 transitions. [2020-10-28 17:13:37,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-28 17:13:37,061 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:13:37,061 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:13:37,061 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-28 17:13:37,062 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:13:37,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:13:37,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1563134581, now seen corresponding path program 1 times [2020-10-28 17:13:37,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:13:37,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230201927] [2020-10-28 17:13:37,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:13:37,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:13:37,137 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:13:37,329 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:13:37,330 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-28 17:13:37,330 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:13:37,330 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 220 [2020-10-28 17:13:37,331 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:13:37,331 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:13:37,333 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:13:37,333 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-28 17:13:37,333 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-28 17:13:37,334 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-28 17:13:37,652 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:13:37,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:13:37,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:13:37,665 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:13:37,679 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:13:37,679 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:13:37,679 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:13:37,679 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 16 [2020-10-28 17:13:37,680 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:13:37,680 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:13:37,680 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:13:37,680 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:13:37,680 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:13:37,681 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:13:37,691 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:13:37,692 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230201927] [2020-10-28 17:13:37,692 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:13:37,692 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 17:13:37,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586096080] [2020-10-28 17:13:37,693 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 17:13:37,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:13:37,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 17:13:37,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 17:13:37,694 INFO L87 Difference]: Start difference. First operand 8329 states and 13047 transitions. Second operand 4 states. [2020-10-28 17:13:38,043 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-10-28 17:13:44,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:13:44,597 INFO L93 Difference]: Finished difference Result 16545 states and 25936 transitions. [2020-10-28 17:13:44,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-28 17:13:44,598 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-28 17:13:44,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:13:44,648 INFO L225 Difference]: With dead ends: 16545 [2020-10-28 17:13:44,648 INFO L226 Difference]: Without dead ends: 8222 [2020-10-28 17:13:44,668 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-28 17:13:44,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8222 states. [2020-10-28 17:13:44,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8222 to 8222. [2020-10-28 17:13:44,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8222 states. [2020-10-28 17:13:44,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8222 states to 8222 states and 12893 transitions. [2020-10-28 17:13:44,859 INFO L78 Accepts]: Start accepts. Automaton has 8222 states and 12893 transitions. Word has length 20 [2020-10-28 17:13:44,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:13:44,859 INFO L481 AbstractCegarLoop]: Abstraction has 8222 states and 12893 transitions. [2020-10-28 17:13:44,859 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-28 17:13:44,859 INFO L276 IsEmpty]: Start isEmpty. Operand 8222 states and 12893 transitions. [2020-10-28 17:13:44,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-28 17:13:44,861 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:13:44,861 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:13:44,861 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-28 17:13:44,862 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:13:44,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:13:44,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1307147288, now seen corresponding path program 1 times [2020-10-28 17:13:44,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:13:44,863 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234989228] [2020-10-28 17:13:44,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:13:44,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:13:44,920 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:13:45,052 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:13:45,052 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-28 17:13:45,052 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:13:45,052 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 153 [2020-10-28 17:13:45,053 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:13:45,053 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:13:45,053 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:13:45,053 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-28 17:13:45,053 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-28 17:13:45,053 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:13:45,328 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:13:45,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:13:45,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:13:45,339 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:13:45,374 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:13:45,375 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:13:45,375 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:13:45,375 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 38 [2020-10-28 17:13:45,375 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:13:45,375 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:13:45,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:13:45,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:13:45,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:13:45,376 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:13:45,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:13:45,392 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234989228] [2020-10-28 17:13:45,392 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:13:45,398 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 17:13:45,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420647843] [2020-10-28 17:13:45,399 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 17:13:45,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:13:45,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 17:13:45,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 17:13:45,400 INFO L87 Difference]: Start difference. First operand 8222 states and 12893 transitions. Second operand 4 states. [2020-10-28 17:13:45,686 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-10-28 17:13:59,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:13:59,563 INFO L93 Difference]: Finished difference Result 16311 states and 25611 transitions. [2020-10-28 17:13:59,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-28 17:13:59,564 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-10-28 17:13:59,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:13:59,588 INFO L225 Difference]: With dead ends: 16311 [2020-10-28 17:13:59,588 INFO L226 Difference]: Without dead ends: 8102 [2020-10-28 17:13:59,605 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-28 17:13:59,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8102 states. [2020-10-28 17:13:59,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8102 to 8102. [2020-10-28 17:13:59,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8102 states. [2020-10-28 17:13:59,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8102 states to 8102 states and 12273 transitions. [2020-10-28 17:13:59,773 INFO L78 Accepts]: Start accepts. Automaton has 8102 states and 12273 transitions. Word has length 24 [2020-10-28 17:13:59,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:13:59,773 INFO L481 AbstractCegarLoop]: Abstraction has 8102 states and 12273 transitions. [2020-10-28 17:13:59,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-28 17:13:59,774 INFO L276 IsEmpty]: Start isEmpty. Operand 8102 states and 12273 transitions. [2020-10-28 17:13:59,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-28 17:13:59,776 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:13:59,776 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:13:59,776 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-28 17:13:59,776 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:13:59,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:13:59,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1836183002, now seen corresponding path program 1 times [2020-10-28 17:13:59,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:13:59,777 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381525004] [2020-10-28 17:13:59,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:13:59,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:13:59,840 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:13:59,886 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:14:00,235 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:14:00,235 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-28 17:14:00,235 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 17:14:00,236 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 417 [2020-10-28 17:14:00,236 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:14:00,236 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:14:00,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:14:00,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-28 17:14:00,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-28 17:14:00,237 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:14:00,580 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:14:00,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:14:00,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:14:00,593 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:14:00,607 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:14:00,607 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:14:00,608 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:14:00,608 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-10-28 17:14:00,608 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:14:00,608 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:14:00,608 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:14:00,609 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:14:00,609 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:14:00,609 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:14:00,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:14:00,623 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381525004] [2020-10-28 17:14:00,623 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:14:00,623 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 17:14:00,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514895381] [2020-10-28 17:14:00,624 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 17:14:00,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:14:00,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 17:14:00,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 17:14:00,625 INFO L87 Difference]: Start difference. First operand 8102 states and 12273 transitions. Second operand 4 states. [2020-10-28 17:14:00,941 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-10-28 17:14:48,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:14:48,608 INFO L93 Difference]: Finished difference Result 16196 states and 24576 transitions. [2020-10-28 17:14:48,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-28 17:14:48,608 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2020-10-28 17:14:48,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:14:48,633 INFO L225 Difference]: With dead ends: 16196 [2020-10-28 17:14:48,633 INFO L226 Difference]: Without dead ends: 8147 [2020-10-28 17:14:48,646 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-28 17:14:48,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8147 states. [2020-10-28 17:14:48,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8147 to 8146. [2020-10-28 17:14:48,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8146 states. [2020-10-28 17:14:48,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8146 states to 8146 states and 12318 transitions. [2020-10-28 17:14:48,795 INFO L78 Accepts]: Start accepts. Automaton has 8146 states and 12318 transitions. Word has length 27 [2020-10-28 17:14:48,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:14:48,795 INFO L481 AbstractCegarLoop]: Abstraction has 8146 states and 12318 transitions. [2020-10-28 17:14:48,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-28 17:14:48,796 INFO L276 IsEmpty]: Start isEmpty. Operand 8146 states and 12318 transitions. [2020-10-28 17:14:48,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-28 17:14:48,797 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:14:48,797 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:14:48,797 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-28 17:14:48,797 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:14:48,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:14:48,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1055385208, now seen corresponding path program 1 times [2020-10-28 17:14:48,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:14:48,798 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223011537] [2020-10-28 17:14:48,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:14:48,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:14:48,853 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:14:48,984 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:14:48,984 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-28 17:14:48,985 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:14:48,985 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 151 [2020-10-28 17:14:48,985 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:14:48,985 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:14:48,985 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:14:48,985 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-28 17:14:48,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-28 17:14:48,986 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:14:49,277 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:14:49,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:14:49,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:14:49,287 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:14:49,298 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:14:49,298 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:14:49,298 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:14:49,298 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-10-28 17:14:49,298 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:14:49,299 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:14:49,299 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:14:49,299 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:14:49,299 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:14:49,299 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:14:49,310 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:14:49,311 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223011537] [2020-10-28 17:14:49,311 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:14:49,311 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 17:14:49,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793474378] [2020-10-28 17:14:49,312 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 17:14:49,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:14:49,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 17:14:49,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 17:14:49,313 INFO L87 Difference]: Start difference. First operand 8146 states and 12318 transitions. Second operand 4 states. [2020-10-28 17:14:49,619 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-10-28 17:15:46,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:15:46,622 INFO L93 Difference]: Finished difference Result 24330 states and 36843 transitions. [2020-10-28 17:15:46,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-28 17:15:46,623 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2020-10-28 17:15:46,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:15:46,667 INFO L225 Difference]: With dead ends: 24330 [2020-10-28 17:15:46,667 INFO L226 Difference]: Without dead ends: 16189 [2020-10-28 17:15:46,683 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-28 17:15:46,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16189 states. [2020-10-28 17:15:46,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16189 to 14932. [2020-10-28 17:15:46,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14932 states. [2020-10-28 17:15:47,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14932 states to 14932 states and 23171 transitions. [2020-10-28 17:15:47,011 INFO L78 Accepts]: Start accepts. Automaton has 14932 states and 23171 transitions. Word has length 28 [2020-10-28 17:15:47,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:15:47,012 INFO L481 AbstractCegarLoop]: Abstraction has 14932 states and 23171 transitions. [2020-10-28 17:15:47,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-28 17:15:47,012 INFO L276 IsEmpty]: Start isEmpty. Operand 14932 states and 23171 transitions. [2020-10-28 17:15:47,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-28 17:15:47,013 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:15:47,013 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:15:47,013 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-28 17:15:47,013 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:15:47,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:15:47,014 INFO L82 PathProgramCache]: Analyzing trace with hash 779196631, now seen corresponding path program 1 times [2020-10-28 17:15:47,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:15:47,014 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196084329] [2020-10-28 17:15:47,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:15:47,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:15:47,074 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:15:47,191 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:15:47,191 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-28 17:15:47,191 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:15:47,191 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 137 [2020-10-28 17:15:47,191 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:15:47,191 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:15:47,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:15:47,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-28 17:15:47,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-28 17:15:47,192 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:15:47,474 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-10-28 17:15:47,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:15:47,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:15:47,488 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:15:47,498 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:15:47,498 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:15:47,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:15:47,500 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 17:15:47,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:15:47,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1196084329] [2020-10-28 17:15:47,513 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:15:47,513 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 17:15:47,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877541272] [2020-10-28 17:15:47,514 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 17:15:47,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:15:47,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 17:15:47,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 17:15:47,515 INFO L87 Difference]: Start difference. First operand 14932 states and 23171 transitions. Second operand 4 states. [2020-10-28 17:15:47,827 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 204