./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/eca-rers2018/Problem10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/eca-rers2018/Problem10.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-17 05:28:26,598 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-17 05:28:26,628 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-17 05:28:26,685 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-17 05:28:26,686 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-17 05:28:26,690 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-17 05:28:26,691 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-17 05:28:26,695 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-17 05:28:26,697 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-17 05:28:26,703 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-17 05:28:26,704 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-17 05:28:26,705 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-17 05:28:26,706 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-17 05:28:26,709 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-17 05:28:26,713 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-17 05:28:26,714 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-17 05:28:26,718 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-17 05:28:26,719 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-17 05:28:26,721 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-17 05:28:26,723 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-17 05:28:26,727 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-17 05:28:26,728 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-17 05:28:26,730 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-17 05:28:26,731 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-17 05:28:26,739 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-17 05:28:26,739 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-17 05:28:26,740 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-17 05:28:26,741 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-17 05:28:26,741 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-17 05:28:26,742 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-17 05:28:26,742 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-17 05:28:26,743 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-17 05:28:26,743 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-17 05:28:26,744 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-17 05:28:26,745 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-17 05:28:26,745 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-17 05:28:26,745 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-17 05:28:26,746 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-17 05:28:26,746 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-17 05:28:26,746 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-17 05:28:26,747 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-17 05:28:26,748 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-17 05:28:26,765 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-17 05:28:26,765 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-17 05:28:26,766 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-17 05:28:26,766 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-17 05:28:26,767 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-17 05:28:26,767 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-17 05:28:26,767 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-17 05:28:26,767 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-17 05:28:26,768 INFO L138 SettingsManager]: * Use SBE=true [2021-12-17 05:28:26,768 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-17 05:28:26,768 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-17 05:28:26,768 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-17 05:28:26,768 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-17 05:28:26,769 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-17 05:28:26,769 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-17 05:28:26,769 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-17 05:28:26,769 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-17 05:28:26,769 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-17 05:28:26,769 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-17 05:28:26,770 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-17 05:28:26,770 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-17 05:28:26,770 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-17 05:28:26,770 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-17 05:28:26,770 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-17 05:28:26,771 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 05:28:26,771 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-17 05:28:26,771 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-17 05:28:26,771 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-17 05:28:26,771 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-17 05:28:26,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-17 05:28:26,772 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-17 05:28:26,772 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-17 05:28:26,772 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-17 05:28:26,772 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-17 05:28:26,772 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/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 [2021-12-17 05:28:26,971 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-17 05:28:26,996 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-17 05:28:26,998 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-17 05:28:26,999 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-17 05:28:27,000 INFO L275 PluginConnector]: CDTParser initialized [2021-12-17 05:28:27,001 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2018/Problem10.c [2021-12-17 05:28:27,060 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9da56e4ea/77d8b9e9ca034ba48d1a2130af09d321/FLAGd1a276407 [2021-12-17 05:28:27,535 INFO L306 CDTParser]: Found 1 translation units. [2021-12-17 05:28:27,535 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem10.c [2021-12-17 05:28:27,555 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9da56e4ea/77d8b9e9ca034ba48d1a2130af09d321/FLAGd1a276407 [2021-12-17 05:28:27,840 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9da56e4ea/77d8b9e9ca034ba48d1a2130af09d321 [2021-12-17 05:28:27,842 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-17 05:28:27,843 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-17 05:28:27,851 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-17 05:28:27,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-17 05:28:27,854 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-17 05:28:27,855 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 05:28:27" (1/1) ... [2021-12-17 05:28:27,857 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38d2f5ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:27, skipping insertion in model container [2021-12-17 05:28:27,857 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 05:28:27" (1/1) ... [2021-12-17 05:28:27,863 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-17 05:28:27,917 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-17 05:28:28,077 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2021-12-17 05:28:28,081 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2021-12-17 05:28:28,446 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 05:28:28,459 INFO L203 MainTranslator]: Completed pre-run [2021-12-17 05:28:28,474 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2021-12-17 05:28:28,475 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2021-12-17 05:28:28,549 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 05:28:28,616 INFO L208 MainTranslator]: Completed translation [2021-12-17 05:28:28,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28 WrapperNode [2021-12-17 05:28:28,616 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-17 05:28:28,617 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-17 05:28:28,617 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-17 05:28:28,617 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-17 05:28:28,625 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,644 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,699 INFO L137 Inliner]: procedures = 274, calls = 248, calls flagged for inlining = 144, calls inlined = 144, statements flattened = 865 [2021-12-17 05:28:28,700 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-17 05:28:28,701 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-17 05:28:28,701 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-17 05:28:28,701 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-17 05:28:28,708 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,709 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,733 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,745 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,750 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,756 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-17 05:28:28,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-17 05:28:28,757 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-17 05:28:28,757 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-17 05:28:28,763 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (1/1) ... [2021-12-17 05:28:28,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 05:28:28,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 05:28:28,808 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-17 05:28:28,833 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-17 05:28:28,848 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-17 05:28:28,849 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_a [2021-12-17 05:28:28,849 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_a [2021-12-17 05:28:28,849 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_b [2021-12-17 05:28:28,849 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_b [2021-12-17 05:28:28,849 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-17 05:28:28,849 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-17 05:28:28,850 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-17 05:28:28,972 INFO L236 CfgBuilder]: Building ICFG [2021-12-17 05:28:28,973 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-17 05:28:29,825 INFO L277 CfgBuilder]: Performing block encoding [2021-12-17 05:28:29,839 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-17 05:28:29,840 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-17 05:28:29,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 05:28:29 BoogieIcfgContainer [2021-12-17 05:28:29,843 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-17 05:28:29,844 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-17 05:28:29,845 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-17 05:28:29,848 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-17 05:28:29,848 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.12 05:28:27" (1/3) ... [2021-12-17 05:28:29,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a5956bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 05:28:29, skipping insertion in model container [2021-12-17 05:28:29,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 05:28:28" (2/3) ... [2021-12-17 05:28:29,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a5956bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 05:28:29, skipping insertion in model container [2021-12-17 05:28:29,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 05:28:29" (3/3) ... [2021-12-17 05:28:29,851 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem10.c [2021-12-17 05:28:29,855 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-17 05:28:29,856 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-12-17 05:28:29,908 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-17 05:28:29,916 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-17 05:28:29,916 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-12-17 05:28:29,959 INFO L276 IsEmpty]: Start isEmpty. Operand has 468 states, 363 states have (on average 1.5922865013774106) internal successors, (578), 365 states have internal predecessors, (578), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) [2021-12-17 05:28:29,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-17 05:28:29,968 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:29,969 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:29,969 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:29,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:29,974 INFO L85 PathProgramCache]: Analyzing trace with hash -1184212657, now seen corresponding path program 1 times [2021-12-17 05:28:29,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:29,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776613908] [2021-12-17 05:28:29,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:29,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:30,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:30,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:30,201 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:30,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776613908] [2021-12-17 05:28:30,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776613908] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:30,202 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:30,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:30,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303472025] [2021-12-17 05:28:30,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:30,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 05:28:30,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:30,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 05:28:30,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-17 05:28:30,234 INFO L87 Difference]: Start difference. First operand has 468 states, 363 states have (on average 1.5922865013774106) internal successors, (578), 365 states have internal predecessors, (578), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:31,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:31,393 INFO L93 Difference]: Finished difference Result 1165 states and 2069 transitions. [2021-12-17 05:28:31,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 05:28:31,396 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-17 05:28:31,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:31,417 INFO L225 Difference]: With dead ends: 1165 [2021-12-17 05:28:31,417 INFO L226 Difference]: Without dead ends: 690 [2021-12-17 05:28:31,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-17 05:28:31,427 INFO L933 BasicCegarLoop]: 421 mSDtfsCounter, 373 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 1106 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 772 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 1106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:31,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 772 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 1106 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-12-17 05:28:31,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-12-17 05:28:31,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 557. [2021-12-17 05:28:31,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 557 states, 455 states have (on average 1.589010989010989) internal successors, (723), 554 states have internal predecessors, (723), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:31,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 823 transitions. [2021-12-17 05:28:31,493 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 823 transitions. Word has length 13 [2021-12-17 05:28:31,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:31,493 INFO L470 AbstractCegarLoop]: Abstraction has 557 states and 823 transitions. [2021-12-17 05:28:31,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:31,494 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 823 transitions. [2021-12-17 05:28:31,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-17 05:28:31,495 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:31,495 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:31,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-17 05:28:31,496 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:31,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:31,497 INFO L85 PathProgramCache]: Analyzing trace with hash -249172658, now seen corresponding path program 1 times [2021-12-17 05:28:31,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:31,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048721216] [2021-12-17 05:28:31,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:31,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:31,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:31,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:31,545 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:31,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048721216] [2021-12-17 05:28:31,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048721216] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:31,545 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:31,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:31,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851095612] [2021-12-17 05:28:31,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:31,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 05:28:31,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:31,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 05:28:31,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-17 05:28:31,549 INFO L87 Difference]: Start difference. First operand 557 states and 823 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:32,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:32,235 INFO L93 Difference]: Finished difference Result 1704 states and 2582 transitions. [2021-12-17 05:28:32,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 05:28:32,237 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-12-17 05:28:32,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:32,242 INFO L225 Difference]: With dead ends: 1704 [2021-12-17 05:28:32,242 INFO L226 Difference]: Without dead ends: 1149 [2021-12-17 05:28:32,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-17 05:28:32,246 INFO L933 BasicCegarLoop]: 534 mSDtfsCounter, 845 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 656 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 845 SdHoareTripleChecker+Valid, 1116 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:32,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [845 Valid, 1116 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 656 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-17 05:28:32,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-12-17 05:28:32,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 888. [2021-12-17 05:28:32,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 888 states, 786 states have (on average 1.5521628498727735) internal successors, (1220), 885 states have internal predecessors, (1220), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:32,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1320 transitions. [2021-12-17 05:28:32,296 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1320 transitions. Word has length 21 [2021-12-17 05:28:32,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:32,299 INFO L470 AbstractCegarLoop]: Abstraction has 888 states and 1320 transitions. [2021-12-17 05:28:32,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:32,300 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1320 transitions. [2021-12-17 05:28:32,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-17 05:28:32,304 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:32,305 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:32,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-17 05:28:32,306 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:32,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:32,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1086962958, now seen corresponding path program 1 times [2021-12-17 05:28:32,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:32,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471955583] [2021-12-17 05:28:32,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:32,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:32,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:32,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:32,365 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:32,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471955583] [2021-12-17 05:28:32,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1471955583] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:32,365 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:32,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:32,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184834620] [2021-12-17 05:28:32,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:32,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:32,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:32,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:32,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:32,368 INFO L87 Difference]: Start difference. First operand 888 states and 1320 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:32,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:32,550 INFO L93 Difference]: Finished difference Result 2201 states and 3267 transitions. [2021-12-17 05:28:32,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:32,551 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-17 05:28:32,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:32,556 INFO L225 Difference]: With dead ends: 2201 [2021-12-17 05:28:32,556 INFO L226 Difference]: Without dead ends: 1315 [2021-12-17 05:28:32,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:32,559 INFO L933 BasicCegarLoop]: 941 mSDtfsCounter, 534 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 534 SdHoareTripleChecker+Valid, 1382 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:32,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [534 Valid, 1382 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:32,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2021-12-17 05:28:32,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1231. [2021-12-17 05:28:32,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1231 states, 1129 states have (on average 1.5491585473870682) internal successors, (1749), 1228 states have internal predecessors, (1749), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:32,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1231 states to 1231 states and 1849 transitions. [2021-12-17 05:28:32,588 INFO L78 Accepts]: Start accepts. Automaton has 1231 states and 1849 transitions. Word has length 24 [2021-12-17 05:28:32,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:32,588 INFO L470 AbstractCegarLoop]: Abstraction has 1231 states and 1849 transitions. [2021-12-17 05:28:32,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:32,589 INFO L276 IsEmpty]: Start isEmpty. Operand 1231 states and 1849 transitions. [2021-12-17 05:28:32,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-17 05:28:32,590 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:32,590 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:32,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-17 05:28:32,590 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:32,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:32,591 INFO L85 PathProgramCache]: Analyzing trace with hash 500156944, now seen corresponding path program 1 times [2021-12-17 05:28:32,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:32,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635316706] [2021-12-17 05:28:32,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:32,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:32,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:32,636 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:32,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:32,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635316706] [2021-12-17 05:28:32,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635316706] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:32,637 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:32,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:32,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190941170] [2021-12-17 05:28:32,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:32,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:32,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:32,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:32,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:32,639 INFO L87 Difference]: Start difference. First operand 1231 states and 1849 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:33,101 INFO L93 Difference]: Finished difference Result 3169 states and 4832 transitions. [2021-12-17 05:28:33,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:33,102 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-17 05:28:33,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:33,109 INFO L225 Difference]: With dead ends: 3169 [2021-12-17 05:28:33,110 INFO L226 Difference]: Without dead ends: 1940 [2021-12-17 05:28:33,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,114 INFO L933 BasicCegarLoop]: 656 mSDtfsCounter, 310 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 317 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 801 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 317 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:33,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 801 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [317 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-17 05:28:33,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1940 states. [2021-12-17 05:28:33,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1940 to 1397. [2021-12-17 05:28:33,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1397 states, 1295 states have (on average 1.4517374517374517) internal successors, (1880), 1394 states have internal predecessors, (1880), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1980 transitions. [2021-12-17 05:28:33,153 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1980 transitions. Word has length 24 [2021-12-17 05:28:33,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:33,153 INFO L470 AbstractCegarLoop]: Abstraction has 1397 states and 1980 transitions. [2021-12-17 05:28:33,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,154 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1980 transitions. [2021-12-17 05:28:33,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-17 05:28:33,155 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:33,155 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:33,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-17 05:28:33,155 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:33,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:33,158 INFO L85 PathProgramCache]: Analyzing trace with hash 1201221522, now seen corresponding path program 1 times [2021-12-17 05:28:33,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:33,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846258328] [2021-12-17 05:28:33,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:33,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:33,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:33,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:33,231 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:33,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846258328] [2021-12-17 05:28:33,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846258328] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:33,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:33,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 05:28:33,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372698904] [2021-12-17 05:28:33,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:33,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:33,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:33,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:33,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,235 INFO L87 Difference]: Start difference. First operand 1397 states and 1980 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:33,393 INFO L93 Difference]: Finished difference Result 4046 states and 5756 transitions. [2021-12-17 05:28:33,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:33,393 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-17 05:28:33,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:33,405 INFO L225 Difference]: With dead ends: 4046 [2021-12-17 05:28:33,406 INFO L226 Difference]: Without dead ends: 2651 [2021-12-17 05:28:33,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,412 INFO L933 BasicCegarLoop]: 529 mSDtfsCounter, 471 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 995 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:33,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [471 Valid, 995 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:33,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2651 states. [2021-12-17 05:28:33,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2651 to 2576. [2021-12-17 05:28:33,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2576 states, 2474 states have (on average 1.4329021827000807) internal successors, (3545), 2573 states have internal predecessors, (3545), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2576 states to 2576 states and 3645 transitions. [2021-12-17 05:28:33,490 INFO L78 Accepts]: Start accepts. Automaton has 2576 states and 3645 transitions. Word has length 24 [2021-12-17 05:28:33,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:33,491 INFO L470 AbstractCegarLoop]: Abstraction has 2576 states and 3645 transitions. [2021-12-17 05:28:33,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,492 INFO L276 IsEmpty]: Start isEmpty. Operand 2576 states and 3645 transitions. [2021-12-17 05:28:33,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-17 05:28:33,493 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:33,493 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-17 05:28:33,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-17 05:28:33,494 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:33,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:33,495 INFO L85 PathProgramCache]: Analyzing trace with hash -995255721, now seen corresponding path program 1 times [2021-12-17 05:28:33,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:33,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742836940] [2021-12-17 05:28:33,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:33,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:33,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:33,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:33,553 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:33,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742836940] [2021-12-17 05:28:33,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742836940] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:33,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:33,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:33,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49409667] [2021-12-17 05:28:33,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:33,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:33,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:33,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:33,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,556 INFO L87 Difference]: Start difference. First operand 2576 states and 3645 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:33,614 INFO L93 Difference]: Finished difference Result 5116 states and 7228 transitions. [2021-12-17 05:28:33,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:33,615 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-17 05:28:33,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:33,634 INFO L225 Difference]: With dead ends: 5116 [2021-12-17 05:28:33,634 INFO L226 Difference]: Without dead ends: 5109 [2021-12-17 05:28:33,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,639 INFO L933 BasicCegarLoop]: 783 mSDtfsCounter, 548 mSDsluCounter, 550 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 1333 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:33,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 1333 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 05:28:33,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5109 states. [2021-12-17 05:28:33,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5109 to 5008. [2021-12-17 05:28:33,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5008 states, 4906 states have (on average 1.428047289033836) internal successors, (7006), 5005 states have internal predecessors, (7006), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5008 states to 5008 states and 7106 transitions. [2021-12-17 05:28:33,782 INFO L78 Accepts]: Start accepts. Automaton has 5008 states and 7106 transitions. Word has length 26 [2021-12-17 05:28:33,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:33,783 INFO L470 AbstractCegarLoop]: Abstraction has 5008 states and 7106 transitions. [2021-12-17 05:28:33,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,783 INFO L276 IsEmpty]: Start isEmpty. Operand 5008 states and 7106 transitions. [2021-12-17 05:28:33,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-17 05:28:33,784 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:33,784 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-17 05:28:33,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-17 05:28:33,784 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:33,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:33,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1419566957, now seen corresponding path program 1 times [2021-12-17 05:28:33,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:33,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206299122] [2021-12-17 05:28:33,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:33,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:33,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:33,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:33,837 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:33,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206299122] [2021-12-17 05:28:33,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206299122] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:33,838 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:33,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 05:28:33,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891739090] [2021-12-17 05:28:33,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:33,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:33,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:33,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:33,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,840 INFO L87 Difference]: Start difference. First operand 5008 states and 7106 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 2 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:33,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:33,921 INFO L93 Difference]: Finished difference Result 10113 states and 14307 transitions. [2021-12-17 05:28:33,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:33,922 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 2 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-17 05:28:33,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:33,941 INFO L225 Difference]: With dead ends: 10113 [2021-12-17 05:28:33,941 INFO L226 Difference]: Without dead ends: 5107 [2021-12-17 05:28:33,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:33,952 INFO L933 BasicCegarLoop]: 885 mSDtfsCounter, 533 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 1431 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:33,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [533 Valid, 1431 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 05:28:33,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5107 states. [2021-12-17 05:28:34,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5107 to 5006. [2021-12-17 05:28:34,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5006 states, 4906 states have (on average 1.424378312270689) internal successors, (6988), 5003 states have internal predecessors, (6988), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:34,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5006 states to 5006 states and 7086 transitions. [2021-12-17 05:28:34,082 INFO L78 Accepts]: Start accepts. Automaton has 5006 states and 7086 transitions. Word has length 26 [2021-12-17 05:28:34,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:34,083 INFO L470 AbstractCegarLoop]: Abstraction has 5006 states and 7086 transitions. [2021-12-17 05:28:34,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 2 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:34,084 INFO L276 IsEmpty]: Start isEmpty. Operand 5006 states and 7086 transitions. [2021-12-17 05:28:34,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-17 05:28:34,087 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:34,087 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-17 05:28:34,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-17 05:28:34,087 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:34,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:34,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1047654979, now seen corresponding path program 1 times [2021-12-17 05:28:34,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:34,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042119354] [2021-12-17 05:28:34,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:34,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:34,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:34,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:34,138 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:34,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042119354] [2021-12-17 05:28:34,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042119354] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:34,140 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:34,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:34,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315779008] [2021-12-17 05:28:34,140 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:34,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:34,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:34,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:34,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:34,142 INFO L87 Difference]: Start difference. First operand 5006 states and 7086 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:34,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:34,315 INFO L93 Difference]: Finished difference Result 11624 states and 16460 transitions. [2021-12-17 05:28:34,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:34,315 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-17 05:28:34,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:34,378 INFO L225 Difference]: With dead ends: 11624 [2021-12-17 05:28:34,379 INFO L226 Difference]: Without dead ends: 6620 [2021-12-17 05:28:34,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:34,392 INFO L933 BasicCegarLoop]: 519 mSDtfsCounter, 490 mSDsluCounter, 446 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 965 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:34,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [490 Valid, 965 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:34,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6620 states. [2021-12-17 05:28:34,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6620 to 6538. [2021-12-17 05:28:34,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6538 states, 6438 states have (on average 1.391425908667288) internal successors, (8958), 6535 states have internal predecessors, (8958), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:34,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6538 states to 6538 states and 9056 transitions. [2021-12-17 05:28:34,567 INFO L78 Accepts]: Start accepts. Automaton has 6538 states and 9056 transitions. Word has length 27 [2021-12-17 05:28:34,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:34,568 INFO L470 AbstractCegarLoop]: Abstraction has 6538 states and 9056 transitions. [2021-12-17 05:28:34,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:34,568 INFO L276 IsEmpty]: Start isEmpty. Operand 6538 states and 9056 transitions. [2021-12-17 05:28:34,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-17 05:28:34,568 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:34,569 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-17 05:28:34,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-17 05:28:34,569 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:34,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:34,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1314457887, now seen corresponding path program 1 times [2021-12-17 05:28:34,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:34,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563913440] [2021-12-17 05:28:34,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:34,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:34,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:34,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:34,590 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:34,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563913440] [2021-12-17 05:28:34,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563913440] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:34,591 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:34,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 05:28:34,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284567510] [2021-12-17 05:28:34,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:34,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:34,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:34,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:34,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:34,592 INFO L87 Difference]: Start difference. First operand 6538 states and 9056 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 2 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:34,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:34,728 INFO L93 Difference]: Finished difference Result 19478 states and 27000 transitions. [2021-12-17 05:28:34,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:34,728 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 2 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-12-17 05:28:34,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:34,760 INFO L225 Difference]: With dead ends: 19478 [2021-12-17 05:28:34,760 INFO L226 Difference]: Without dead ends: 12942 [2021-12-17 05:28:34,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:34,769 INFO L933 BasicCegarLoop]: 562 mSDtfsCounter, 526 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 526 SdHoareTripleChecker+Valid, 1108 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:34,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [526 Valid, 1108 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 05:28:34,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12942 states. [2021-12-17 05:28:35,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12942 to 12844. [2021-12-17 05:28:35,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12844 states, 12744 states have (on average 1.3879472693032016) internal successors, (17688), 12841 states have internal predecessors, (17688), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:35,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12844 states to 12844 states and 17786 transitions. [2021-12-17 05:28:35,152 INFO L78 Accepts]: Start accepts. Automaton has 12844 states and 17786 transitions. Word has length 28 [2021-12-17 05:28:35,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:35,153 INFO L470 AbstractCegarLoop]: Abstraction has 12844 states and 17786 transitions. [2021-12-17 05:28:35,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 2 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:35,154 INFO L276 IsEmpty]: Start isEmpty. Operand 12844 states and 17786 transitions. [2021-12-17 05:28:35,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-17 05:28:35,154 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:35,155 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1] [2021-12-17 05:28:35,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-17 05:28:35,155 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:35,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:35,156 INFO L85 PathProgramCache]: Analyzing trace with hash 451574756, now seen corresponding path program 1 times [2021-12-17 05:28:35,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:35,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30609694] [2021-12-17 05:28:35,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:35,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:35,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:35,192 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:35,193 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:35,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30609694] [2021-12-17 05:28:35,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30609694] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:35,193 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:35,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 05:28:35,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017164378] [2021-12-17 05:28:35,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:35,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:35,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:35,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:35,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:35,195 INFO L87 Difference]: Start difference. First operand 12844 states and 17786 transitions. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 2 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:35,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:35,497 INFO L93 Difference]: Finished difference Result 37395 states and 51773 transitions. [2021-12-17 05:28:35,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:35,497 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 2 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-12-17 05:28:35,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:35,545 INFO L225 Difference]: With dead ends: 37395 [2021-12-17 05:28:35,545 INFO L226 Difference]: Without dead ends: 24553 [2021-12-17 05:28:35,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:35,570 INFO L933 BasicCegarLoop]: 598 mSDtfsCounter, 470 mSDsluCounter, 477 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 470 SdHoareTripleChecker+Valid, 1075 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:35,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [470 Valid, 1075 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:35,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24553 states. [2021-12-17 05:28:35,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24553 to 24472. [2021-12-17 05:28:35,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24472 states, 24372 states have (on average 1.3669784999179386) internal successors, (33316), 24469 states have internal predecessors, (33316), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:36,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24472 states to 24472 states and 33414 transitions. [2021-12-17 05:28:36,041 INFO L78 Accepts]: Start accepts. Automaton has 24472 states and 33414 transitions. Word has length 30 [2021-12-17 05:28:36,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:36,041 INFO L470 AbstractCegarLoop]: Abstraction has 24472 states and 33414 transitions. [2021-12-17 05:28:36,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 2 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:36,042 INFO L276 IsEmpty]: Start isEmpty. Operand 24472 states and 33414 transitions. [2021-12-17 05:28:36,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-17 05:28:36,042 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:36,043 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-12-17 05:28:36,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-17 05:28:36,044 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:36,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:36,045 INFO L85 PathProgramCache]: Analyzing trace with hash 354633128, now seen corresponding path program 1 times [2021-12-17 05:28:36,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:36,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176585553] [2021-12-17 05:28:36,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:36,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:36,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:36,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:36,094 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:36,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176585553] [2021-12-17 05:28:36,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176585553] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:36,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:36,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:36,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744896573] [2021-12-17 05:28:36,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:36,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:36,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:36,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:36,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:36,098 INFO L87 Difference]: Start difference. First operand 24472 states and 33414 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:36,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:36,895 INFO L93 Difference]: Finished difference Result 57156 states and 79614 transitions. [2021-12-17 05:28:36,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:36,896 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-12-17 05:28:36,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:36,958 INFO L225 Difference]: With dead ends: 57156 [2021-12-17 05:28:36,958 INFO L226 Difference]: Without dead ends: 32686 [2021-12-17 05:28:36,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:36,990 INFO L933 BasicCegarLoop]: 537 mSDtfsCounter, 217 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:36,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 721 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-17 05:28:37,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32686 states. [2021-12-17 05:28:37,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32686 to 32682. [2021-12-17 05:28:37,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32682 states, 32582 states have (on average 1.3177214412866) internal successors, (42934), 32679 states have internal predecessors, (42934), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:37,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32682 states to 32682 states and 43032 transitions. [2021-12-17 05:28:37,597 INFO L78 Accepts]: Start accepts. Automaton has 32682 states and 43032 transitions. Word has length 33 [2021-12-17 05:28:37,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:37,597 INFO L470 AbstractCegarLoop]: Abstraction has 32682 states and 43032 transitions. [2021-12-17 05:28:37,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:37,598 INFO L276 IsEmpty]: Start isEmpty. Operand 32682 states and 43032 transitions. [2021-12-17 05:28:37,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-17 05:28:37,598 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:37,598 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-12-17 05:28:37,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-12-17 05:28:37,598 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:37,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:37,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1594983404, now seen corresponding path program 1 times [2021-12-17 05:28:37,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:37,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600284707] [2021-12-17 05:28:37,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:37,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:37,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:37,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:37,641 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:37,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600284707] [2021-12-17 05:28:37,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600284707] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:37,641 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:37,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:37,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273064661] [2021-12-17 05:28:37,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:37,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:37,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:37,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:37,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:37,643 INFO L87 Difference]: Start difference. First operand 32682 states and 43032 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:38,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:38,108 INFO L93 Difference]: Finished difference Result 95233 states and 125515 transitions. [2021-12-17 05:28:38,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:38,109 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-12-17 05:28:38,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:38,253 INFO L225 Difference]: With dead ends: 95233 [2021-12-17 05:28:38,254 INFO L226 Difference]: Without dead ends: 62553 [2021-12-17 05:28:38,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:38,281 INFO L933 BasicCegarLoop]: 866 mSDtfsCounter, 504 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 1360 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:38,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [504 Valid, 1360 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:38,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62553 states. [2021-12-17 05:28:39,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62553 to 62464. [2021-12-17 05:28:39,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62464 states, 62364 states have (on average 1.3094092745814894) internal successors, (81660), 62461 states have internal predecessors, (81660), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:39,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62464 states to 62464 states and 81758 transitions. [2021-12-17 05:28:39,204 INFO L78 Accepts]: Start accepts. Automaton has 62464 states and 81758 transitions. Word has length 33 [2021-12-17 05:28:39,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:39,204 INFO L470 AbstractCegarLoop]: Abstraction has 62464 states and 81758 transitions. [2021-12-17 05:28:39,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:39,205 INFO L276 IsEmpty]: Start isEmpty. Operand 62464 states and 81758 transitions. [2021-12-17 05:28:39,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-17 05:28:39,205 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:39,206 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:39,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-12-17 05:28:39,206 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:39,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:39,207 INFO L85 PathProgramCache]: Analyzing trace with hash 276354924, now seen corresponding path program 1 times [2021-12-17 05:28:39,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:39,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503470188] [2021-12-17 05:28:39,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:39,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:39,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:39,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:39,231 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:39,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503470188] [2021-12-17 05:28:39,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503470188] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:39,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:39,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:39,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118947873] [2021-12-17 05:28:39,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:39,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:39,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:39,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:39,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:39,233 INFO L87 Difference]: Start difference. First operand 62464 states and 81758 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:40,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:40,208 INFO L93 Difference]: Finished difference Result 140242 states and 187436 transitions. [2021-12-17 05:28:40,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:40,209 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-12-17 05:28:40,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:40,680 INFO L225 Difference]: With dead ends: 140242 [2021-12-17 05:28:40,680 INFO L226 Difference]: Without dead ends: 77780 [2021-12-17 05:28:40,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:40,714 INFO L933 BasicCegarLoop]: 524 mSDtfsCounter, 276 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 688 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:40,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [276 Valid, 688 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-17 05:28:40,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77780 states. [2021-12-17 05:28:41,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77780 to 77776. [2021-12-17 05:28:41,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77776 states, 77676 states have (on average 1.2978526185694423) internal successors, (100812), 77773 states have internal predecessors, (100812), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:41,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77776 states to 77776 states and 100910 transitions. [2021-12-17 05:28:41,757 INFO L78 Accepts]: Start accepts. Automaton has 77776 states and 100910 transitions. Word has length 36 [2021-12-17 05:28:41,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:41,758 INFO L470 AbstractCegarLoop]: Abstraction has 77776 states and 100910 transitions. [2021-12-17 05:28:41,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:41,759 INFO L276 IsEmpty]: Start isEmpty. Operand 77776 states and 100910 transitions. [2021-12-17 05:28:41,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-17 05:28:41,759 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:41,760 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:41,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-12-17 05:28:41,760 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:41,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:41,761 INFO L85 PathProgramCache]: Analyzing trace with hash -209128006, now seen corresponding path program 1 times [2021-12-17 05:28:41,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:41,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768565921] [2021-12-17 05:28:41,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:41,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:41,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:41,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:41,804 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:41,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768565921] [2021-12-17 05:28:41,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768565921] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:41,805 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:41,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:41,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475949040] [2021-12-17 05:28:41,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:41,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:41,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:41,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:41,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:41,807 INFO L87 Difference]: Start difference. First operand 77776 states and 100910 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:42,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:42,815 INFO L93 Difference]: Finished difference Result 197843 states and 256189 transitions. [2021-12-17 05:28:42,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:42,816 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-12-17 05:28:42,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:43,053 INFO L225 Difference]: With dead ends: 197843 [2021-12-17 05:28:43,053 INFO L226 Difference]: Without dead ends: 120069 [2021-12-17 05:28:43,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:43,107 INFO L933 BasicCegarLoop]: 980 mSDtfsCounter, 440 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 1445 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:43,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [440 Valid, 1445 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:43,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120069 states. [2021-12-17 05:28:44,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120069 to 112110. [2021-12-17 05:28:44,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112110 states, 112010 states have (on average 1.261289170609767) internal successors, (141277), 112107 states have internal predecessors, (141277), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:44,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112110 states to 112110 states and 141375 transitions. [2021-12-17 05:28:44,690 INFO L78 Accepts]: Start accepts. Automaton has 112110 states and 141375 transitions. Word has length 40 [2021-12-17 05:28:44,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:44,690 INFO L470 AbstractCegarLoop]: Abstraction has 112110 states and 141375 transitions. [2021-12-17 05:28:44,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:44,691 INFO L276 IsEmpty]: Start isEmpty. Operand 112110 states and 141375 transitions. [2021-12-17 05:28:44,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-17 05:28:44,691 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:44,691 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:44,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-12-17 05:28:44,692 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:44,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:44,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1653138166, now seen corresponding path program 1 times [2021-12-17 05:28:44,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:44,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786395584] [2021-12-17 05:28:44,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:44,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:44,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:44,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:44,734 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:44,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786395584] [2021-12-17 05:28:44,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786395584] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:44,734 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:44,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 05:28:44,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690991870] [2021-12-17 05:28:44,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:44,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:44,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:44,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:44,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:44,736 INFO L87 Difference]: Start difference. First operand 112110 states and 141375 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:45,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:45,688 INFO L93 Difference]: Finished difference Result 237825 states and 300101 transitions. [2021-12-17 05:28:45,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:45,695 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-12-17 05:28:45,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:45,890 INFO L225 Difference]: With dead ends: 237825 [2021-12-17 05:28:45,891 INFO L226 Difference]: Without dead ends: 125717 [2021-12-17 05:28:45,939 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:45,939 INFO L933 BasicCegarLoop]: 542 mSDtfsCounter, 424 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 1005 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:45,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [424 Valid, 1005 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:28:46,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125717 states. [2021-12-17 05:28:47,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125717 to 123108. [2021-12-17 05:28:47,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123108 states, 123008 states have (on average 1.2577230749219563) internal successors, (154710), 123105 states have internal predecessors, (154710), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:47,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123108 states to 123108 states and 154808 transitions. [2021-12-17 05:28:47,369 INFO L78 Accepts]: Start accepts. Automaton has 123108 states and 154808 transitions. Word has length 40 [2021-12-17 05:28:47,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:47,369 INFO L470 AbstractCegarLoop]: Abstraction has 123108 states and 154808 transitions. [2021-12-17 05:28:47,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:47,369 INFO L276 IsEmpty]: Start isEmpty. Operand 123108 states and 154808 transitions. [2021-12-17 05:28:47,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-17 05:28:47,370 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:47,370 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:47,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-12-17 05:28:47,371 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:47,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:47,371 INFO L85 PathProgramCache]: Analyzing trace with hash -1240470838, now seen corresponding path program 1 times [2021-12-17 05:28:47,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:47,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431903498] [2021-12-17 05:28:47,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:47,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:47,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:47,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:47,395 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:47,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431903498] [2021-12-17 05:28:47,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431903498] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:47,396 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:47,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:47,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476527168] [2021-12-17 05:28:47,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:47,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:47,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:47,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:47,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:47,397 INFO L87 Difference]: Start difference. First operand 123108 states and 154808 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:48,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:48,323 INFO L93 Difference]: Finished difference Result 220065 states and 276031 transitions. [2021-12-17 05:28:48,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:28:48,324 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-12-17 05:28:48,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:48,702 INFO L225 Difference]: With dead ends: 220065 [2021-12-17 05:28:48,702 INFO L226 Difference]: Without dead ends: 220062 [2021-12-17 05:28:48,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:48,771 INFO L933 BasicCegarLoop]: 977 mSDtfsCounter, 527 mSDsluCounter, 540 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 527 SdHoareTripleChecker+Valid, 1517 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:48,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [527 Valid, 1517 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 05:28:48,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220062 states. [2021-12-17 05:28:51,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220062 to 219726. [2021-12-17 05:28:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219726 states, 219626 states have (on average 1.2533170025406828) internal successors, (275261), 219723 states have internal predecessors, (275261), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:51,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219726 states to 219726 states and 275359 transitions. [2021-12-17 05:28:51,865 INFO L78 Accepts]: Start accepts. Automaton has 219726 states and 275359 transitions. Word has length 45 [2021-12-17 05:28:51,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:51,866 INFO L470 AbstractCegarLoop]: Abstraction has 219726 states and 275359 transitions. [2021-12-17 05:28:51,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:51,866 INFO L276 IsEmpty]: Start isEmpty. Operand 219726 states and 275359 transitions. [2021-12-17 05:28:51,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-17 05:28:51,866 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:51,866 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:51,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-12-17 05:28:51,867 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:51,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:51,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1976305641, now seen corresponding path program 1 times [2021-12-17 05:28:51,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:51,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897126341] [2021-12-17 05:28:51,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:51,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:51,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:51,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:51,898 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:51,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897126341] [2021-12-17 05:28:51,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897126341] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:51,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:51,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:51,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769266114] [2021-12-17 05:28:51,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:51,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 05:28:51,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:51,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 05:28:51,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-17 05:28:51,901 INFO L87 Difference]: Start difference. First operand 219726 states and 275359 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:54,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:28:54,525 INFO L93 Difference]: Finished difference Result 576525 states and 721998 transitions. [2021-12-17 05:28:54,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 05:28:54,526 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-12-17 05:28:54,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:28:55,768 INFO L225 Difference]: With dead ends: 576525 [2021-12-17 05:28:55,769 INFO L226 Difference]: Without dead ends: 356801 [2021-12-17 05:28:55,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-17 05:28:55,856 INFO L933 BasicCegarLoop]: 584 mSDtfsCounter, 815 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 645 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 815 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-17 05:28:55,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [815 Valid, 725 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 645 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-17 05:28:56,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356801 states. [2021-12-17 05:28:58,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356801 to 219721. [2021-12-17 05:28:58,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219721 states, 219626 states have (on average 1.2428173349239162) internal successors, (272955), 219718 states have internal predecessors, (272955), 93 states have call successors, (93), 2 states have call predecessors, (93), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:59,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219721 states to 219721 states and 273048 transitions. [2021-12-17 05:28:59,269 INFO L78 Accepts]: Start accepts. Automaton has 219721 states and 273048 transitions. Word has length 48 [2021-12-17 05:28:59,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:28:59,269 INFO L470 AbstractCegarLoop]: Abstraction has 219721 states and 273048 transitions. [2021-12-17 05:28:59,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:28:59,270 INFO L276 IsEmpty]: Start isEmpty. Operand 219721 states and 273048 transitions. [2021-12-17 05:28:59,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-12-17 05:28:59,270 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:28:59,270 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:28:59,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-12-17 05:28:59,271 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:28:59,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:28:59,271 INFO L85 PathProgramCache]: Analyzing trace with hash 648337281, now seen corresponding path program 1 times [2021-12-17 05:28:59,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:28:59,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227210197] [2021-12-17 05:28:59,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:28:59,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:28:59,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:28:59,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:28:59,313 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:28:59,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227210197] [2021-12-17 05:28:59,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227210197] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:28:59,313 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:28:59,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:28:59,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589430258] [2021-12-17 05:28:59,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:28:59,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:28:59,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:28:59,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:28:59,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:28:59,315 INFO L87 Difference]: Start difference. First operand 219721 states and 273048 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:01,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:29:01,288 INFO L93 Difference]: Finished difference Result 412959 states and 513823 transitions. [2021-12-17 05:29:01,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:29:01,289 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-12-17 05:29:01,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:29:01,609 INFO L225 Difference]: With dead ends: 412959 [2021-12-17 05:29:01,609 INFO L226 Difference]: Without dead ends: 211839 [2021-12-17 05:29:01,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:29:01,743 INFO L933 BasicCegarLoop]: 284 mSDtfsCounter, 377 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-17 05:29:01,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [377 Valid, 361 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-17 05:29:01,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211839 states. [2021-12-17 05:29:03,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211839 to 143497. [2021-12-17 05:29:03,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143497 states, 143402 states have (on average 1.1941744187668233) internal successors, (171247), 143494 states have internal predecessors, (171247), 93 states have call successors, (93), 2 states have call predecessors, (93), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:04,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143497 states to 143497 states and 171340 transitions. [2021-12-17 05:29:04,138 INFO L78 Accepts]: Start accepts. Automaton has 143497 states and 171340 transitions. Word has length 70 [2021-12-17 05:29:04,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:29:04,139 INFO L470 AbstractCegarLoop]: Abstraction has 143497 states and 171340 transitions. [2021-12-17 05:29:04,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:04,139 INFO L276 IsEmpty]: Start isEmpty. Operand 143497 states and 171340 transitions. [2021-12-17 05:29:04,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-17 05:29:04,140 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:29:04,140 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 1] [2021-12-17 05:29:04,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-12-17 05:29:04,141 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:29:04,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:29:04,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1754865588, now seen corresponding path program 1 times [2021-12-17 05:29:04,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:29:04,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184060591] [2021-12-17 05:29:04,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:29:04,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:29:04,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:29:04,203 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 05:29:04,204 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:29:04,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184060591] [2021-12-17 05:29:04,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184060591] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:29:04,204 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:29:04,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:29:04,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144896049] [2021-12-17 05:29:04,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:29:04,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:29:04,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:29:04,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:29:04,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:29:04,206 INFO L87 Difference]: Start difference. First operand 143497 states and 171340 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:05,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:29:05,265 INFO L93 Difference]: Finished difference Result 205647 states and 244265 transitions. [2021-12-17 05:29:05,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:29:05,266 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-12-17 05:29:05,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:29:05,592 INFO L225 Difference]: With dead ends: 205647 [2021-12-17 05:29:05,592 INFO L226 Difference]: Without dead ends: 205642 [2021-12-17 05:29:05,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:29:05,613 INFO L933 BasicCegarLoop]: 800 mSDtfsCounter, 445 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 1324 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 05:29:05,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [445 Valid, 1324 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 05:29:05,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205642 states. [2021-12-17 05:29:07,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205642 to 205428. [2021-12-17 05:29:07,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205428 states, 205333 states have (on average 1.1815976973988593) internal successors, (242621), 205425 states have internal predecessors, (242621), 93 states have call successors, (93), 2 states have call predecessors, (93), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:08,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205428 states to 205428 states and 242714 transitions. [2021-12-17 05:29:08,562 INFO L78 Accepts]: Start accepts. Automaton has 205428 states and 242714 transitions. Word has length 113 [2021-12-17 05:29:08,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:29:08,562 INFO L470 AbstractCegarLoop]: Abstraction has 205428 states and 242714 transitions. [2021-12-17 05:29:08,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:08,563 INFO L276 IsEmpty]: Start isEmpty. Operand 205428 states and 242714 transitions. [2021-12-17 05:29:08,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-12-17 05:29:08,564 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:29:08,564 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:29:08,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-12-17 05:29:08,564 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:29:08,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:29:08,565 INFO L85 PathProgramCache]: Analyzing trace with hash -2128909688, now seen corresponding path program 1 times [2021-12-17 05:29:08,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:29:08,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242636877] [2021-12-17 05:29:08,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:29:08,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:29:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:29:08,613 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-17 05:29:08,614 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:29:08,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242636877] [2021-12-17 05:29:08,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242636877] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:29:08,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:29:08,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:29:08,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351292534] [2021-12-17 05:29:08,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:29:08,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:29:08,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:29:08,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:29:08,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:29:08,616 INFO L87 Difference]: Start difference. First operand 205428 states and 242714 transitions. Second operand has 3 states, 3 states have (on average 46.0) internal successors, (138), 3 states have internal predecessors, (138), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:09,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 05:29:09,218 INFO L93 Difference]: Finished difference Result 205430 states and 242715 transitions. [2021-12-17 05:29:09,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 05:29:09,219 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 3 states have internal predecessors, (138), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-12-17 05:29:09,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 05:29:09,568 INFO L225 Difference]: With dead ends: 205430 [2021-12-17 05:29:09,568 INFO L226 Difference]: Without dead ends: 205423 [2021-12-17 05:29:09,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:29:09,636 INFO L933 BasicCegarLoop]: 466 mSDtfsCounter, 523 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 05:29:09,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [523 Valid, 466 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 05:29:09,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205423 states. [2021-12-17 05:29:12,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205423 to 205423. [2021-12-17 05:29:12,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205423 states, 205333 states have (on average 1.1782665231599403) internal successors, (241937), 205420 states have internal predecessors, (241937), 88 states have call successors, (88), 2 states have call predecessors, (88), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:12,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205423 states to 205423 states and 242025 transitions. [2021-12-17 05:29:12,623 INFO L78 Accepts]: Start accepts. Automaton has 205423 states and 242025 transitions. Word has length 145 [2021-12-17 05:29:12,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 05:29:12,624 INFO L470 AbstractCegarLoop]: Abstraction has 205423 states and 242025 transitions. [2021-12-17 05:29:12,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 3 states have internal predecessors, (138), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 05:29:12,624 INFO L276 IsEmpty]: Start isEmpty. Operand 205423 states and 242025 transitions. [2021-12-17 05:29:12,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-12-17 05:29:12,625 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 05:29:12,625 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 05:29:12,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-12-17 05:29:12,626 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 05:29:12,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 05:29:12,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1572407842, now seen corresponding path program 1 times [2021-12-17 05:29:12,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 05:29:12,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372352441] [2021-12-17 05:29:12,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 05:29:12,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 05:29:12,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 05:29:12,710 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-17 05:29:12,711 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 05:29:12,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372352441] [2021-12-17 05:29:12,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372352441] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 05:29:12,711 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 05:29:12,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 05:29:12,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114331402] [2021-12-17 05:29:12,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 05:29:12,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 05:29:12,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 05:29:12,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 05:29:12,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 05:29:12,713 INFO L87 Difference]: Start difference. First operand 205423 states and 242025 transitions. Second operand has 3 states, 3 states have (on average 46.333333333333336) internal successors, (139), 3 states have internal predecessors, (139), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)