./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 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/config/AutomizerReach.xml -i ../../sv-benchmarks/c/eca-rers2018/Problem10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL --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 0.2.1-dev-0f8a17c [2021-11-19 04:56:07,454 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 04:56:07,456 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 04:56:07,495 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 04:56:07,496 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 04:56:07,498 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 04:56:07,500 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 04:56:07,504 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 04:56:07,506 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 04:56:07,508 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 04:56:07,510 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 04:56:07,512 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 04:56:07,513 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 04:56:07,514 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 04:56:07,517 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 04:56:07,519 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 04:56:07,520 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 04:56:07,522 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 04:56:07,525 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 04:56:07,528 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 04:56:07,531 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 04:56:07,533 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 04:56:07,535 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 04:56:07,536 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 04:56:07,541 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 04:56:07,542 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 04:56:07,542 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 04:56:07,544 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 04:56:07,545 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 04:56:07,547 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 04:56:07,547 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 04:56:07,548 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 04:56:07,550 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 04:56:07,551 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 04:56:07,553 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 04:56:07,553 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 04:56:07,555 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 04:56:07,555 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 04:56:07,556 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 04:56:07,558 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 04:56:07,559 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 04:56:07,560 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-19 04:56:07,593 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 04:56:07,594 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 04:56:07,594 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-19 04:56:07,594 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-19 04:56:07,595 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 04:56:07,596 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 04:56:07,597 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-19 04:56:07,597 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-19 04:56:07,597 INFO L138 SettingsManager]: * Use SBE=true [2021-11-19 04:56:07,598 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 04:56:07,598 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 04:56:07,599 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 04:56:07,599 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 04:56:07,599 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 04:56:07,600 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 04:56:07,600 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 04:56:07,600 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 04:56:07,601 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 04:56:07,601 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 04:56:07,601 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 04:56:07,602 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 04:56:07,602 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 04:56:07,602 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-19 04:56:07,603 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 04:56:07,603 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 04:56:07,604 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 04:56:07,604 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 04:56:07,604 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 04:56:07,604 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-19 04:56:07,605 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 04:56:07,605 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-19 04:56:07,605 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-19 04:56:07,605 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 04:56:07,606 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 04:56:07,606 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 [2021-11-19 04:56:07,943 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 04:56:07,973 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 04:56:07,977 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 04:56:07,978 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 04:56:07,979 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 04:56:07,982 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/../../sv-benchmarks/c/eca-rers2018/Problem10.c [2021-11-19 04:56:08,097 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/data/f7ebf82f5/f2e9f7e1b8b34d359ee87275914db65c/FLAG541e054d7 [2021-11-19 04:56:08,917 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 04:56:08,918 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/sv-benchmarks/c/eca-rers2018/Problem10.c [2021-11-19 04:56:08,944 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/data/f7ebf82f5/f2e9f7e1b8b34d359ee87275914db65c/FLAG541e054d7 [2021-11-19 04:56:09,122 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/data/f7ebf82f5/f2e9f7e1b8b34d359ee87275914db65c [2021-11-19 04:56:09,125 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 04:56:09,128 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 04:56:09,132 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 04:56:09,132 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 04:56:09,136 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 04:56:09,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:56:09" (1/1) ... [2021-11-19 04:56:09,138 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c9c3d84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:09, skipping insertion in model container [2021-11-19 04:56:09,138 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:56:09" (1/1) ... [2021-11-19 04:56:09,148 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 04:56:09,235 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 04:56:09,448 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2021-11-19 04:56:09,453 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2021-11-19 04:56:09,970 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 04:56:09,985 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 04:56:09,998 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2021-11-19 04:56:09,999 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2021-11-19 04:56:10,138 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 04:56:10,244 INFO L208 MainTranslator]: Completed translation [2021-11-19 04:56:10,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10 WrapperNode [2021-11-19 04:56:10,246 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 04:56:10,247 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 04:56:10,247 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 04:56:10,248 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 04:56:10,257 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,301 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,390 INFO L137 Inliner]: procedures = 274, calls = 248, calls flagged for inlining = 144, calls inlined = 144, statements flattened = 865 [2021-11-19 04:56:10,390 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 04:56:10,391 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 04:56:10,392 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 04:56:10,392 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 04:56:10,405 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,406 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,414 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,415 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,448 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,488 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,494 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,520 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 04:56:10,521 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 04:56:10,522 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 04:56:10,522 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 04:56:10,536 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (1/1) ... [2021-11-19 04:56:10,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 04:56:10,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:56:10,605 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 04:56:10,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b45378d-062d-49ac-a58a-35bc2833cbf9/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 04:56:10,667 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 04:56:10,667 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_a [2021-11-19 04:56:10,667 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_a [2021-11-19 04:56:10,668 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_b [2021-11-19 04:56:10,668 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_b [2021-11-19 04:56:10,668 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 04:56:10,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 04:56:10,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 04:56:10,877 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 04:56:10,879 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 04:56:12,281 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 04:56:12,296 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 04:56:12,296 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-19 04:56:12,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:56:12 BoogieIcfgContainer [2021-11-19 04:56:12,300 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 04:56:12,302 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 04:56:12,303 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 04:56:12,307 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 04:56:12,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:56:09" (1/3) ... [2021-11-19 04:56:12,309 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f506e7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:56:12, skipping insertion in model container [2021-11-19 04:56:12,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:10" (2/3) ... [2021-11-19 04:56:12,309 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f506e7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:56:12, skipping insertion in model container [2021-11-19 04:56:12,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:56:12" (3/3) ... [2021-11-19 04:56:12,312 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem10.c [2021-11-19 04:56:12,319 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 04:56:12,319 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-19 04:56:12,386 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 04:56:12,394 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 [2021-11-19 04:56:12,394 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-19 04:56:12,445 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) [2021-11-19 04:56:12,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-19 04:56:12,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:12,455 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:56:12,456 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:12,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:12,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1184212657, now seen corresponding path program 1 times [2021-11-19 04:56:12,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:12,478 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847969012] [2021-11-19 04:56:12,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:12,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:12,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:12,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:12,808 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:12,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847969012] [2021-11-19 04:56:12,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847969012] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:12,810 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:12,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:12,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183415803] [2021-11-19 04:56:12,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:12,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:56:12,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:12,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:56:12,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:56:12,878 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) [2021-11-19 04:56:14,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:14,655 INFO L93 Difference]: Finished difference Result 1165 states and 2069 transitions. [2021-11-19 04:56:14,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:56:14,658 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 [2021-11-19 04:56:14,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:14,681 INFO L225 Difference]: With dead ends: 1165 [2021-11-19 04:56:14,681 INFO L226 Difference]: Without dead ends: 690 [2021-11-19 04:56:14,692 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 [2021-11-19 04:56:14,697 INFO L933 BasicCegarLoop]: 421 mSDtfsCounter, 373 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 1106 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s 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, 1.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:14,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 772 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 1106 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-19 04:56:14,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-11-19 04:56:14,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 557. [2021-11-19 04:56:14,825 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) [2021-11-19 04:56:14,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 823 transitions. [2021-11-19 04:56:14,836 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 823 transitions. Word has length 13 [2021-11-19 04:56:14,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:14,837 INFO L470 AbstractCegarLoop]: Abstraction has 557 states and 823 transitions. [2021-11-19 04:56:14,837 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) [2021-11-19 04:56:14,843 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 823 transitions. [2021-11-19 04:56:14,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-19 04:56:14,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:14,846 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] [2021-11-19 04:56:14,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 04:56:14,847 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:14,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:14,848 INFO L85 PathProgramCache]: Analyzing trace with hash -249172658, now seen corresponding path program 1 times [2021-11-19 04:56:14,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:14,849 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742552632] [2021-11-19 04:56:14,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:14,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:14,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:14,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:14,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:14,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742552632] [2021-11-19 04:56:14,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742552632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:14,933 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:14,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:14,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092249281] [2021-11-19 04:56:14,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:14,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:56:14,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:14,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:56:14,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:56:14,951 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) [2021-11-19 04:56:15,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:15,977 INFO L93 Difference]: Finished difference Result 1704 states and 2582 transitions. [2021-11-19 04:56:15,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:56:15,978 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 [2021-11-19 04:56:15,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:15,987 INFO L225 Difference]: With dead ends: 1704 [2021-11-19 04:56:15,988 INFO L226 Difference]: Without dead ends: 1149 [2021-11-19 04:56:15,995 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 [2021-11-19 04:56:15,998 INFO L933 BasicCegarLoop]: 534 mSDtfsCounter, 845 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 656 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s 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, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:15,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [845 Valid, 1116 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 656 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 04:56:16,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-19 04:56:16,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 888. [2021-11-19 04:56:16,074 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) [2021-11-19 04:56:16,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1320 transitions. [2021-11-19 04:56:16,113 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1320 transitions. Word has length 21 [2021-11-19 04:56:16,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:16,114 INFO L470 AbstractCegarLoop]: Abstraction has 888 states and 1320 transitions. [2021-11-19 04:56:16,114 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) [2021-11-19 04:56:16,114 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1320 transitions. [2021-11-19 04:56:16,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-19 04:56:16,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:16,116 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] [2021-11-19 04:56:16,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 04:56:16,117 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:16,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:16,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1086962958, now seen corresponding path program 1 times [2021-11-19 04:56:16,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:16,118 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538264743] [2021-11-19 04:56:16,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:16,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:16,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:16,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:16,232 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:16,234 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538264743] [2021-11-19 04:56:16,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538264743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:16,236 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:16,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:16,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366267973] [2021-11-19 04:56:16,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:16,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:16,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:16,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:16,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:16,240 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) [2021-11-19 04:56:16,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:16,341 INFO L93 Difference]: Finished difference Result 2645 states and 3935 transitions. [2021-11-19 04:56:16,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:16,343 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 [2021-11-19 04:56:16,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:16,357 INFO L225 Difference]: With dead ends: 2645 [2021-11-19 04:56:16,357 INFO L226 Difference]: Without dead ends: 1759 [2021-11-19 04:56:16,360 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 [2021-11-19 04:56:16,362 INFO L933 BasicCegarLoop]: 690 mSDtfsCounter, 461 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 461 SdHoareTripleChecker+Valid, 1255 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:16,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [461 Valid, 1255 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:56:16,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1759 states. [2021-11-19 04:56:16,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1759 to 888. [2021-11-19 04:56:16,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 888 states, 786 states have (on average 1.5508905852417303) internal successors, (1219), 885 states have internal predecessors, (1219), 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) [2021-11-19 04:56:16,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1319 transitions. [2021-11-19 04:56:16,412 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1319 transitions. Word has length 24 [2021-11-19 04:56:16,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:16,413 INFO L470 AbstractCegarLoop]: Abstraction has 888 states and 1319 transitions. [2021-11-19 04:56:16,413 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) [2021-11-19 04:56:16,414 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1319 transitions. [2021-11-19 04:56:16,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-19 04:56:16,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:16,420 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] [2021-11-19 04:56:16,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 04:56:16,424 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:16,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:16,425 INFO L85 PathProgramCache]: Analyzing trace with hash 1345128396, now seen corresponding path program 1 times [2021-11-19 04:56:16,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:16,425 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184042582] [2021-11-19 04:56:16,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:16,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:16,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:16,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:16,494 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:16,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184042582] [2021-11-19 04:56:16,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184042582] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:16,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:16,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:16,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469281853] [2021-11-19 04:56:16,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:16,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:16,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:16,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:16,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:16,497 INFO L87 Difference]: Start difference. First operand 888 states and 1319 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) [2021-11-19 04:56:16,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:16,748 INFO L93 Difference]: Finished difference Result 2201 states and 3265 transitions. [2021-11-19 04:56:16,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:16,750 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 [2021-11-19 04:56:16,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:16,760 INFO L225 Difference]: With dead ends: 2201 [2021-11-19 04:56:16,760 INFO L226 Difference]: Without dead ends: 1315 [2021-11-19 04:56:16,763 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 [2021-11-19 04:56:16,776 INFO L933 BasicCegarLoop]: 941 mSDtfsCounter, 533 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 1382 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:16,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [533 Valid, 1382 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:56:16,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2021-11-19 04:56:16,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1231. [2021-11-19 04:56:16,831 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) [2021-11-19 04:56:16,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1231 states to 1231 states and 1849 transitions. [2021-11-19 04:56:16,841 INFO L78 Accepts]: Start accepts. Automaton has 1231 states and 1849 transitions. Word has length 24 [2021-11-19 04:56:16,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:16,841 INFO L470 AbstractCegarLoop]: Abstraction has 1231 states and 1849 transitions. [2021-11-19 04:56:16,842 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) [2021-11-19 04:56:16,842 INFO L276 IsEmpty]: Start isEmpty. Operand 1231 states and 1849 transitions. [2021-11-19 04:56:16,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-19 04:56:16,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:16,844 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] [2021-11-19 04:56:16,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 04:56:16,844 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:16,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:16,846 INFO L85 PathProgramCache]: Analyzing trace with hash 500156944, now seen corresponding path program 1 times [2021-11-19 04:56:16,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:16,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911097943] [2021-11-19 04:56:16,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:16,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:16,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:16,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:16,967 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:16,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911097943] [2021-11-19 04:56:16,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911097943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:16,968 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:16,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:16,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869361589] [2021-11-19 04:56:16,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:16,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:16,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:16,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:16,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:16,971 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) [2021-11-19 04:56:17,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:17,674 INFO L93 Difference]: Finished difference Result 3169 states and 4832 transitions. [2021-11-19 04:56:17,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:17,675 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 [2021-11-19 04:56:17,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:17,690 INFO L225 Difference]: With dead ends: 3169 [2021-11-19 04:56:17,691 INFO L226 Difference]: Without dead ends: 1940 [2021-11-19 04:56:17,694 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 [2021-11-19 04:56:17,695 INFO L933 BasicCegarLoop]: 656 mSDtfsCounter, 310 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 317 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:17,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 801 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [317 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:56:17,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1940 states. [2021-11-19 04:56:17,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1940 to 1397. [2021-11-19 04:56:17,749 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) [2021-11-19 04:56:17,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1980 transitions. [2021-11-19 04:56:17,758 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1980 transitions. Word has length 24 [2021-11-19 04:56:17,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:17,759 INFO L470 AbstractCegarLoop]: Abstraction has 1397 states and 1980 transitions. [2021-11-19 04:56:17,759 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) [2021-11-19 04:56:17,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1980 transitions. [2021-11-19 04:56:17,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-19 04:56:17,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:17,761 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] [2021-11-19 04:56:17,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-19 04:56:17,762 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:17,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:17,763 INFO L85 PathProgramCache]: Analyzing trace with hash 1201221522, now seen corresponding path program 1 times [2021-11-19 04:56:17,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:17,763 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786367368] [2021-11-19 04:56:17,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:17,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:17,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:17,836 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:17,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786367368] [2021-11-19 04:56:17,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786367368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:17,837 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:17,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 04:56:17,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657070054] [2021-11-19 04:56:17,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:17,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:17,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:17,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:17,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:17,840 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) [2021-11-19 04:56:17,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:18,000 INFO L93 Difference]: Finished difference Result 4140 states and 5880 transitions. [2021-11-19 04:56:18,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:18,001 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 [2021-11-19 04:56:18,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:18,020 INFO L225 Difference]: With dead ends: 4140 [2021-11-19 04:56:18,021 INFO L226 Difference]: Without dead ends: 2745 [2021-11-19 04:56:18,024 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 [2021-11-19 04:56:18,026 INFO L933 BasicCegarLoop]: 550 mSDtfsCounter, 510 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 510 SdHoareTripleChecker+Valid, 1073 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:18,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [510 Valid, 1073 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 04:56:18,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2745 states. [2021-11-19 04:56:18,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2745 to 2657. [2021-11-19 04:56:18,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2657 states, 2555 states have (on average 1.4348336594911937) internal successors, (3666), 2654 states have internal predecessors, (3666), 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) [2021-11-19 04:56:18,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2657 states to 2657 states and 3766 transitions. [2021-11-19 04:56:18,131 INFO L78 Accepts]: Start accepts. Automaton has 2657 states and 3766 transitions. Word has length 24 [2021-11-19 04:56:18,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:18,132 INFO L470 AbstractCegarLoop]: Abstraction has 2657 states and 3766 transitions. [2021-11-19 04:56:18,132 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) [2021-11-19 04:56:18,132 INFO L276 IsEmpty]: Start isEmpty. Operand 2657 states and 3766 transitions. [2021-11-19 04:56:18,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-19 04:56:18,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:18,134 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] [2021-11-19 04:56:18,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-19 04:56:18,135 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:18,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:18,138 INFO L85 PathProgramCache]: Analyzing trace with hash -1417555436, now seen corresponding path program 1 times [2021-11-19 04:56:18,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:18,138 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648655984] [2021-11-19 04:56:18,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:18,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:18,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:18,197 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:18,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648655984] [2021-11-19 04:56:18,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648655984] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:18,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:18,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:18,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2354040] [2021-11-19 04:56:18,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:18,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:18,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:18,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:18,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:18,200 INFO L87 Difference]: Start difference. First operand 2657 states and 3766 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 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) [2021-11-19 04:56:18,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:18,958 INFO L93 Difference]: Finished difference Result 6143 states and 8908 transitions. [2021-11-19 04:56:18,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:18,959 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 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 25 [2021-11-19 04:56:18,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:18,984 INFO L225 Difference]: With dead ends: 6143 [2021-11-19 04:56:18,984 INFO L226 Difference]: Without dead ends: 3488 [2021-11-19 04:56:18,989 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 [2021-11-19 04:56:18,991 INFO L933 BasicCegarLoop]: 538 mSDtfsCounter, 230 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:18,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 722 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 04:56:18,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3488 states. [2021-11-19 04:56:19,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3488 to 3484. [2021-11-19 04:56:19,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3484 states, 3382 states have (on average 1.3746303962152573) internal successors, (4649), 3481 states have internal predecessors, (4649), 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) [2021-11-19 04:56:19,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3484 states to 3484 states and 4749 transitions. [2021-11-19 04:56:19,122 INFO L78 Accepts]: Start accepts. Automaton has 3484 states and 4749 transitions. Word has length 25 [2021-11-19 04:56:19,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:19,124 INFO L470 AbstractCegarLoop]: Abstraction has 3484 states and 4749 transitions. [2021-11-19 04:56:19,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 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) [2021-11-19 04:56:19,125 INFO L276 IsEmpty]: Start isEmpty. Operand 3484 states and 4749 transitions. [2021-11-19 04:56:19,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-19 04:56:19,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:19,127 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] [2021-11-19 04:56:19,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-19 04:56:19,128 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:19,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:19,130 INFO L85 PathProgramCache]: Analyzing trace with hash 2032440408, now seen corresponding path program 1 times [2021-11-19 04:56:19,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:19,130 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307734699] [2021-11-19 04:56:19,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:19,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:19,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:19,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:19,203 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:19,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307734699] [2021-11-19 04:56:19,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307734699] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:19,204 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:19,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:19,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899883865] [2021-11-19 04:56:19,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:19,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:19,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:19,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:19,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:19,206 INFO L87 Difference]: Start difference. First operand 3484 states and 4749 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 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) [2021-11-19 04:56:19,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:19,995 INFO L93 Difference]: Finished difference Result 7813 states and 10890 transitions. [2021-11-19 04:56:19,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:19,996 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 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 25 [2021-11-19 04:56:19,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:20,026 INFO L225 Difference]: With dead ends: 7813 [2021-11-19 04:56:20,027 INFO L226 Difference]: Without dead ends: 4331 [2021-11-19 04:56:20,034 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 [2021-11-19 04:56:20,035 INFO L933 BasicCegarLoop]: 518 mSDtfsCounter, 299 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:20,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 682 Invalid, 584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 04:56:20,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4331 states. [2021-11-19 04:56:20,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4331 to 4327. [2021-11-19 04:56:20,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4327 states, 4225 states have (on average 1.353846153846154) internal successors, (5720), 4324 states have internal predecessors, (5720), 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) [2021-11-19 04:56:20,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4327 states to 4327 states and 5820 transitions. [2021-11-19 04:56:20,175 INFO L78 Accepts]: Start accepts. Automaton has 4327 states and 5820 transitions. Word has length 25 [2021-11-19 04:56:20,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:20,175 INFO L470 AbstractCegarLoop]: Abstraction has 4327 states and 5820 transitions. [2021-11-19 04:56:20,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 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) [2021-11-19 04:56:20,176 INFO L276 IsEmpty]: Start isEmpty. Operand 4327 states and 5820 transitions. [2021-11-19 04:56:20,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-19 04:56:20,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:20,177 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] [2021-11-19 04:56:20,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-19 04:56:20,178 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:20,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:20,178 INFO L85 PathProgramCache]: Analyzing trace with hash -995255721, now seen corresponding path program 1 times [2021-11-19 04:56:20,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:20,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945529172] [2021-11-19 04:56:20,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:20,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:20,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:20,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:20,210 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:20,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945529172] [2021-11-19 04:56:20,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945529172] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:20,211 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:20,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:20,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069029279] [2021-11-19 04:56:20,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:20,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:20,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:20,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:20,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:20,213 INFO L87 Difference]: Start difference. First operand 4327 states and 5820 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) [2021-11-19 04:56:20,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:20,309 INFO L93 Difference]: Finished difference Result 8549 states and 11509 transitions. [2021-11-19 04:56:20,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:20,310 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 [2021-11-19 04:56:20,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:20,368 INFO L225 Difference]: With dead ends: 8549 [2021-11-19 04:56:20,368 INFO L226 Difference]: Without dead ends: 8542 [2021-11-19 04:56:20,372 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 [2021-11-19 04:56:20,373 INFO L933 BasicCegarLoop]: 1005 mSDtfsCounter, 548 mSDsluCounter, 550 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 1555 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:20,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 1555 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:56:20,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8542 states. [2021-11-19 04:56:20,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8542 to 8441. [2021-11-19 04:56:20,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8441 states, 8339 states have (on average 1.3492025422712555) internal successors, (11251), 8438 states have internal predecessors, (11251), 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) [2021-11-19 04:56:20,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8441 states to 8441 states and 11351 transitions. [2021-11-19 04:56:20,660 INFO L78 Accepts]: Start accepts. Automaton has 8441 states and 11351 transitions. Word has length 26 [2021-11-19 04:56:20,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:20,660 INFO L470 AbstractCegarLoop]: Abstraction has 8441 states and 11351 transitions. [2021-11-19 04:56:20,660 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) [2021-11-19 04:56:20,661 INFO L276 IsEmpty]: Start isEmpty. Operand 8441 states and 11351 transitions. [2021-11-19 04:56:20,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-19 04:56:20,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:20,662 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] [2021-11-19 04:56:20,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 04:56:20,662 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:20,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:20,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1419566957, now seen corresponding path program 1 times [2021-11-19 04:56:20,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:20,664 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887884138] [2021-11-19 04:56:20,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:20,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:20,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:20,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:20,697 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:20,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887884138] [2021-11-19 04:56:20,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887884138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:20,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:20,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 04:56:20,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79153989] [2021-11-19 04:56:20,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:20,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:20,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:20,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:20,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:20,700 INFO L87 Difference]: Start difference. First operand 8441 states and 11351 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) [2021-11-19 04:56:20,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:20,825 INFO L93 Difference]: Finished difference Result 16979 states and 22797 transitions. [2021-11-19 04:56:20,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:20,826 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 [2021-11-19 04:56:20,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:20,852 INFO L225 Difference]: With dead ends: 16979 [2021-11-19 04:56:20,853 INFO L226 Difference]: Without dead ends: 8540 [2021-11-19 04:56:20,867 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 [2021-11-19 04:56:20,868 INFO L933 BasicCegarLoop]: 663 mSDtfsCounter, 533 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 1209 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:20,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [533 Valid, 1209 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:56:20,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8540 states. [2021-11-19 04:56:21,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8540 to 8439. [2021-11-19 04:56:21,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8439 states, 8339 states have (on average 1.3441659671423432) internal successors, (11209), 8436 states have internal predecessors, (11209), 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) [2021-11-19 04:56:21,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8439 states to 8439 states and 11307 transitions. [2021-11-19 04:56:21,180 INFO L78 Accepts]: Start accepts. Automaton has 8439 states and 11307 transitions. Word has length 26 [2021-11-19 04:56:21,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:21,182 INFO L470 AbstractCegarLoop]: Abstraction has 8439 states and 11307 transitions. [2021-11-19 04:56:21,183 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) [2021-11-19 04:56:21,184 INFO L276 IsEmpty]: Start isEmpty. Operand 8439 states and 11307 transitions. [2021-11-19 04:56:21,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 04:56:21,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:21,187 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] [2021-11-19 04:56:21,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-19 04:56:21,188 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:21,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:21,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1314457887, now seen corresponding path program 1 times [2021-11-19 04:56:21,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:21,190 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41152021] [2021-11-19 04:56:21,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:21,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:21,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:21,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:21,298 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:21,298 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41152021] [2021-11-19 04:56:21,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41152021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:21,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:21,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 04:56:21,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797173345] [2021-11-19 04:56:21,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:21,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:21,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:21,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:21,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:21,300 INFO L87 Difference]: Start difference. First operand 8439 states and 11307 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) [2021-11-19 04:56:21,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:21,470 INFO L93 Difference]: Finished difference Result 25142 states and 33722 transitions. [2021-11-19 04:56:21,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:21,471 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 [2021-11-19 04:56:21,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:21,517 INFO L225 Difference]: With dead ends: 25142 [2021-11-19 04:56:21,517 INFO L226 Difference]: Without dead ends: 16705 [2021-11-19 04:56:21,534 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 [2021-11-19 04:56:21,536 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 [2021-11-19 04:56:21,536 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] [2021-11-19 04:56:21,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16705 states. [2021-11-19 04:56:21,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16705 to 16607. [2021-11-19 04:56:21,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16607 states, 16507 states have (on average 1.3390076937057007) internal successors, (22103), 16604 states have internal predecessors, (22103), 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) [2021-11-19 04:56:22,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16607 states to 16607 states and 22201 transitions. [2021-11-19 04:56:22,036 INFO L78 Accepts]: Start accepts. Automaton has 16607 states and 22201 transitions. Word has length 28 [2021-11-19 04:56:22,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:22,037 INFO L470 AbstractCegarLoop]: Abstraction has 16607 states and 22201 transitions. [2021-11-19 04:56:22,037 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) [2021-11-19 04:56:22,037 INFO L276 IsEmpty]: Start isEmpty. Operand 16607 states and 22201 transitions. [2021-11-19 04:56:22,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-19 04:56:22,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:22,038 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] [2021-11-19 04:56:22,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-19 04:56:22,039 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:22,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:22,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1594983404, now seen corresponding path program 1 times [2021-11-19 04:56:22,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:22,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2147413616] [2021-11-19 04:56:22,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:22,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:22,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:22,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:22,182 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:22,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2147413616] [2021-11-19 04:56:22,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2147413616] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:22,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:22,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:22,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940322586] [2021-11-19 04:56:22,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:22,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:22,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:22,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:22,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:22,185 INFO L87 Difference]: Start difference. First operand 16607 states and 22201 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) [2021-11-19 04:56:22,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:22,523 INFO L93 Difference]: Finished difference Result 48238 states and 64732 transitions. [2021-11-19 04:56:22,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:22,524 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 [2021-11-19 04:56:22,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:22,767 INFO L225 Difference]: With dead ends: 48238 [2021-11-19 04:56:22,767 INFO L226 Difference]: Without dead ends: 31633 [2021-11-19 04:56:22,788 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 [2021-11-19 04:56:22,789 INFO L933 BasicCegarLoop]: 858 mSDtfsCounter, 504 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 1352 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:22,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [504 Valid, 1352 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 04:56:22,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31633 states. [2021-11-19 04:56:23,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31633 to 31544. [2021-11-19 04:56:23,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31544 states, 31444 states have (on average 1.3317644065640504) internal successors, (41876), 31541 states have internal predecessors, (41876), 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) [2021-11-19 04:56:23,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31544 states to 31544 states and 41974 transitions. [2021-11-19 04:56:23,570 INFO L78 Accepts]: Start accepts. Automaton has 31544 states and 41974 transitions. Word has length 33 [2021-11-19 04:56:23,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:23,571 INFO L470 AbstractCegarLoop]: Abstraction has 31544 states and 41974 transitions. [2021-11-19 04:56:23,572 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) [2021-11-19 04:56:23,572 INFO L276 IsEmpty]: Start isEmpty. Operand 31544 states and 41974 transitions. [2021-11-19 04:56:23,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-19 04:56:23,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:23,573 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] [2021-11-19 04:56:23,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-19 04:56:23,574 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:23,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:23,575 INFO L85 PathProgramCache]: Analyzing trace with hash 132362279, now seen corresponding path program 1 times [2021-11-19 04:56:23,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:23,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833836392] [2021-11-19 04:56:23,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:23,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:23,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:23,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:23,625 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:23,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833836392] [2021-11-19 04:56:23,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833836392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:23,626 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:23,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:23,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611477864] [2021-11-19 04:56:23,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:23,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:23,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:23,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:23,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:23,629 INFO L87 Difference]: Start difference. First operand 31544 states and 41974 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 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) [2021-11-19 04:56:24,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:24,303 INFO L93 Difference]: Finished difference Result 73175 states and 97409 transitions. [2021-11-19 04:56:24,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:24,304 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 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 34 [2021-11-19 04:56:24,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:24,431 INFO L225 Difference]: With dead ends: 73175 [2021-11-19 04:56:24,431 INFO L226 Difference]: Without dead ends: 41633 [2021-11-19 04:56:24,605 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 [2021-11-19 04:56:24,607 INFO L933 BasicCegarLoop]: 519 mSDtfsCounter, 483 mSDsluCounter, 446 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 483 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, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:24,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [483 Valid, 965 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:56:24,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41633 states. [2021-11-19 04:56:25,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41633 to 41551. [2021-11-19 04:56:25,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41551 states, 41451 states have (on average 1.3153603049383609) internal successors, (54523), 41548 states have internal predecessors, (54523), 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) [2021-11-19 04:56:25,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41551 states to 41551 states and 54621 transitions. [2021-11-19 04:56:25,621 INFO L78 Accepts]: Start accepts. Automaton has 41551 states and 54621 transitions. Word has length 34 [2021-11-19 04:56:25,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:25,623 INFO L470 AbstractCegarLoop]: Abstraction has 41551 states and 54621 transitions. [2021-11-19 04:56:25,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 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) [2021-11-19 04:56:25,624 INFO L276 IsEmpty]: Start isEmpty. Operand 41551 states and 54621 transitions. [2021-11-19 04:56:25,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-19 04:56:25,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:25,625 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] [2021-11-19 04:56:25,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-19 04:56:25,626 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:25,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:25,626 INFO L85 PathProgramCache]: Analyzing trace with hash -209128006, now seen corresponding path program 1 times [2021-11-19 04:56:25,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:25,627 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108232720] [2021-11-19 04:56:25,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:25,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:25,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:25,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:25,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:25,700 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108232720] [2021-11-19 04:56:25,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108232720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:25,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:25,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:25,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963769044] [2021-11-19 04:56:25,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:25,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:25,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:25,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:25,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:25,703 INFO L87 Difference]: Start difference. First operand 41551 states and 54621 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) [2021-11-19 04:56:26,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:26,758 INFO L93 Difference]: Finished difference Result 105458 states and 138388 transitions. [2021-11-19 04:56:26,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:26,759 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 [2021-11-19 04:56:26,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:27,112 INFO L225 Difference]: With dead ends: 105458 [2021-11-19 04:56:27,112 INFO L226 Difference]: Without dead ends: 63909 [2021-11-19 04:56:27,138 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 [2021-11-19 04:56:27,139 INFO L933 BasicCegarLoop]: 980 mSDtfsCounter, 440 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:27,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [440 Valid, 1445 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 04:56:27,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63909 states. [2021-11-19 04:56:28,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63909 to 59950. [2021-11-19 04:56:28,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59950 states, 59850 states have (on average 1.2822222222222222) internal successors, (76741), 59947 states have internal predecessors, (76741), 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) [2021-11-19 04:56:28,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59950 states to 59950 states and 76839 transitions. [2021-11-19 04:56:28,405 INFO L78 Accepts]: Start accepts. Automaton has 59950 states and 76839 transitions. Word has length 40 [2021-11-19 04:56:28,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:28,405 INFO L470 AbstractCegarLoop]: Abstraction has 59950 states and 76839 transitions. [2021-11-19 04:56:28,405 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) [2021-11-19 04:56:28,687 INFO L276 IsEmpty]: Start isEmpty. Operand 59950 states and 76839 transitions. [2021-11-19 04:56:28,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-19 04:56:28,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:28,688 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] [2021-11-19 04:56:28,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-19 04:56:28,688 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:28,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:28,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1653138166, now seen corresponding path program 1 times [2021-11-19 04:56:28,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:28,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934821929] [2021-11-19 04:56:28,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:28,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:28,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:28,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:28,768 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:28,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934821929] [2021-11-19 04:56:28,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934821929] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:28,769 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:28,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 04:56:28,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869147448] [2021-11-19 04:56:28,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:28,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:28,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:28,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:28,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:28,771 INFO L87 Difference]: Start difference. First operand 59950 states and 76839 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) [2021-11-19 04:56:29,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:29,702 INFO L93 Difference]: Finished difference Result 157117 states and 202813 transitions. [2021-11-19 04:56:29,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:29,703 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 [2021-11-19 04:56:29,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:29,860 INFO L225 Difference]: With dead ends: 157117 [2021-11-19 04:56:29,861 INFO L226 Difference]: Without dead ends: 97169 [2021-11-19 04:56:29,894 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 [2021-11-19 04:56:29,896 INFO L933 BasicCegarLoop]: 530 mSDtfsCounter, 450 mSDsluCounter, 454 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 450 SdHoareTripleChecker+Valid, 984 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:29,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [450 Valid, 984 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:56:29,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97169 states. [2021-11-19 04:56:31,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97169 to 97090. [2021-11-19 04:56:31,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97090 states, 96990 states have (on average 1.274615939787607) internal successors, (123625), 97087 states have internal predecessors, (123625), 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) [2021-11-19 04:56:31,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97090 states to 97090 states and 123723 transitions. [2021-11-19 04:56:31,909 INFO L78 Accepts]: Start accepts. Automaton has 97090 states and 123723 transitions. Word has length 40 [2021-11-19 04:56:31,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:31,910 INFO L470 AbstractCegarLoop]: Abstraction has 97090 states and 123723 transitions. [2021-11-19 04:56:31,910 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) [2021-11-19 04:56:31,912 INFO L276 IsEmpty]: Start isEmpty. Operand 97090 states and 123723 transitions. [2021-11-19 04:56:31,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-19 04:56:31,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:31,913 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] [2021-11-19 04:56:31,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-19 04:56:31,914 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:31,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:31,914 INFO L85 PathProgramCache]: Analyzing trace with hash -1240470838, now seen corresponding path program 1 times [2021-11-19 04:56:31,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:31,915 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461005281] [2021-11-19 04:56:31,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:31,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:31,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:31,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:31,993 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:31,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461005281] [2021-11-19 04:56:31,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461005281] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:31,993 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:31,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:31,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467327834] [2021-11-19 04:56:31,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:31,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:31,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:31,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:31,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:31,998 INFO L87 Difference]: Start difference. First operand 97090 states and 123723 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) [2021-11-19 04:56:32,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:32,558 INFO L93 Difference]: Finished difference Result 174054 states and 221151 transitions. [2021-11-19 04:56:32,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:32,559 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 [2021-11-19 04:56:32,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:32,837 INFO L225 Difference]: With dead ends: 174054 [2021-11-19 04:56:32,837 INFO L226 Difference]: Without dead ends: 174051 [2021-11-19 04:56:33,489 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 [2021-11-19 04:56:33,495 INFO L933 BasicCegarLoop]: 1036 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, 1576 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 [2021-11-19 04:56:33,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [527 Valid, 1576 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:56:33,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174051 states. [2021-11-19 04:56:35,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174051 to 173830. [2021-11-19 04:56:35,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173830 states, 173730 states have (on average 1.269723133598112) internal successors, (220589), 173827 states have internal predecessors, (220589), 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) [2021-11-19 04:56:36,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173830 states to 173830 states and 220687 transitions. [2021-11-19 04:56:36,391 INFO L78 Accepts]: Start accepts. Automaton has 173830 states and 220687 transitions. Word has length 45 [2021-11-19 04:56:36,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:36,391 INFO L470 AbstractCegarLoop]: Abstraction has 173830 states and 220687 transitions. [2021-11-19 04:56:36,391 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) [2021-11-19 04:56:36,391 INFO L276 IsEmpty]: Start isEmpty. Operand 173830 states and 220687 transitions. [2021-11-19 04:56:36,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-19 04:56:36,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:36,393 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] [2021-11-19 04:56:36,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-19 04:56:36,393 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:36,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:36,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1976305641, now seen corresponding path program 1 times [2021-11-19 04:56:36,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:36,395 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349227744] [2021-11-19 04:56:36,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:36,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:36,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:36,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:36,438 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:36,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349227744] [2021-11-19 04:56:36,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349227744] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:36,438 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:36,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:36,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742602207] [2021-11-19 04:56:36,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:36,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:56:36,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:36,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:56:36,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:56:36,441 INFO L87 Difference]: Start difference. First operand 173830 states and 220687 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) [2021-11-19 04:56:39,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:39,378 INFO L93 Difference]: Finished difference Result 454683 states and 576582 transitions. [2021-11-19 04:56:39,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:56:39,379 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 [2021-11-19 04:56:39,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:39,789 INFO L225 Difference]: With dead ends: 454683 [2021-11-19 04:56:39,790 INFO L226 Difference]: Without dead ends: 280855 [2021-11-19 04:56:39,895 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 [2021-11-19 04:56:39,896 INFO L933 BasicCegarLoop]: 584 mSDtfsCounter, 695 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 645 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 695 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, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:39,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [695 Valid, 725 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 645 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 04:56:40,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280855 states. [2021-11-19 04:56:43,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280855 to 173825. [2021-11-19 04:56:43,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173825 states, 173730 states have (on average 1.2597075922408334) internal successors, (218849), 173822 states have internal predecessors, (218849), 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) [2021-11-19 04:56:44,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173825 states to 173825 states and 218942 transitions. [2021-11-19 04:56:44,446 INFO L78 Accepts]: Start accepts. Automaton has 173825 states and 218942 transitions. Word has length 48 [2021-11-19 04:56:44,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:44,446 INFO L470 AbstractCegarLoop]: Abstraction has 173825 states and 218942 transitions. [2021-11-19 04:56:44,447 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) [2021-11-19 04:56:44,447 INFO L276 IsEmpty]: Start isEmpty. Operand 173825 states and 218942 transitions. [2021-11-19 04:56:44,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-19 04:56:44,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:44,448 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] [2021-11-19 04:56:44,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-19 04:56:44,448 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:44,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:44,449 INFO L85 PathProgramCache]: Analyzing trace with hash 951319779, now seen corresponding path program 1 times [2021-11-19 04:56:44,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:44,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307507365] [2021-11-19 04:56:44,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:44,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:44,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:44,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:44,490 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:44,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307507365] [2021-11-19 04:56:44,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307507365] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:44,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:44,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:44,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147261145] [2021-11-19 04:56:44,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:44,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:44,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:44,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:44,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:44,494 INFO L87 Difference]: Start difference. First operand 173825 states and 218942 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 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) [2021-11-19 04:56:47,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:47,428 INFO L93 Difference]: Finished difference Result 343392 states and 432799 transitions. [2021-11-19 04:56:47,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:47,429 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 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 58 [2021-11-19 04:56:47,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:47,702 INFO L225 Difference]: With dead ends: 343392 [2021-11-19 04:56:47,702 INFO L226 Difference]: Without dead ends: 169569 [2021-11-19 04:56:47,770 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 [2021-11-19 04:56:47,770 INFO L933 BasicCegarLoop]: 284 mSDtfsCounter, 389 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 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, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:47,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [389 Valid, 361 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:56:47,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169569 states. [2021-11-19 04:56:49,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169569 to 89809. [2021-11-19 04:56:49,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89809 states, 89714 states have (on average 1.2017299418151013) internal successors, (107812), 89806 states have internal predecessors, (107812), 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) [2021-11-19 04:56:49,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89809 states to 89809 states and 107905 transitions. [2021-11-19 04:56:49,826 INFO L78 Accepts]: Start accepts. Automaton has 89809 states and 107905 transitions. Word has length 58 [2021-11-19 04:56:49,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:49,827 INFO L470 AbstractCegarLoop]: Abstraction has 89809 states and 107905 transitions. [2021-11-19 04:56:49,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 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) [2021-11-19 04:56:49,827 INFO L276 IsEmpty]: Start isEmpty. Operand 89809 states and 107905 transitions. [2021-11-19 04:56:49,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-19 04:56:49,838 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:49,838 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] [2021-11-19 04:56:49,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-19 04:56:49,839 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:49,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:49,839 INFO L85 PathProgramCache]: Analyzing trace with hash 1754865588, now seen corresponding path program 1 times [2021-11-19 04:56:49,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:49,840 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888091235] [2021-11-19 04:56:49,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:49,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:49,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:49,920 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:49,920 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:49,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888091235] [2021-11-19 04:56:49,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888091235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:49,921 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:49,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:49,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973332478] [2021-11-19 04:56:49,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:49,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:49,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:49,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:49,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:49,926 INFO L87 Difference]: Start difference. First operand 89809 states and 107905 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) [2021-11-19 04:56:51,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:51,067 INFO L93 Difference]: Finished difference Result 128298 states and 153371 transitions. [2021-11-19 04:56:51,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:51,068 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 [2021-11-19 04:56:51,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:51,334 INFO L225 Difference]: With dead ends: 128298 [2021-11-19 04:56:51,335 INFO L226 Difference]: Without dead ends: 128293 [2021-11-19 04:56:51,344 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 [2021-11-19 04:56:51,345 INFO L933 BasicCegarLoop]: 740 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, 1264 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 [2021-11-19 04:56:51,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [445 Valid, 1264 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:56:51,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128293 states. [2021-11-19 04:56:53,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128293 to 128079. [2021-11-19 04:56:53,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128079 states, 127984 states have (on average 1.1906722715339417) internal successors, (152387), 128076 states have internal predecessors, (152387), 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) [2021-11-19 04:56:53,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128079 states to 128079 states and 152480 transitions. [2021-11-19 04:56:53,443 INFO L78 Accepts]: Start accepts. Automaton has 128079 states and 152480 transitions. Word has length 113 [2021-11-19 04:56:53,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:53,444 INFO L470 AbstractCegarLoop]: Abstraction has 128079 states and 152480 transitions. [2021-11-19 04:56:53,444 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) [2021-11-19 04:56:53,444 INFO L276 IsEmpty]: Start isEmpty. Operand 128079 states and 152480 transitions. [2021-11-19 04:56:53,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 04:56:53,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:53,447 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:56:53,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-19 04:56:53,448 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:53,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:53,449 INFO L85 PathProgramCache]: Analyzing trace with hash 149557454, now seen corresponding path program 1 times [2021-11-19 04:56:53,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:53,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426788948] [2021-11-19 04:56:53,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:53,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:53,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:53,523 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 04:56:53,523 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:53,523 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426788948] [2021-11-19 04:56:53,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426788948] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:53,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:53,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:53,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929823173] [2021-11-19 04:56:53,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:53,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:53,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:53,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:53,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:53,527 INFO L87 Difference]: Start difference. First operand 128079 states and 152480 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) [2021-11-19 04:56:55,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:56:55,689 INFO L93 Difference]: Finished difference Result 275491 states and 332198 transitions. [2021-11-19 04:56:55,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:56:55,691 INFO L78 Accepts]: Start accepts. Automaton has 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) Word has length 144 [2021-11-19 04:56:55,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:56:56,079 INFO L225 Difference]: With dead ends: 275491 [2021-11-19 04:56:56,079 INFO L226 Difference]: Without dead ends: 147535 [2021-11-19 04:56:56,148 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 [2021-11-19 04:56:56,149 INFO L933 BasicCegarLoop]: 371 mSDtfsCounter, 323 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:56:56,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [323 Valid, 518 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:56:56,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147535 states. [2021-11-19 04:56:58,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147535 to 147227. [2021-11-19 04:56:58,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147227 states, 147132 states have (on average 1.1926773237636952) internal successors, (175481), 147224 states have internal predecessors, (175481), 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) [2021-11-19 04:56:58,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147227 states to 147227 states and 175574 transitions. [2021-11-19 04:56:58,377 INFO L78 Accepts]: Start accepts. Automaton has 147227 states and 175574 transitions. Word has length 144 [2021-11-19 04:56:58,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:56:58,378 INFO L470 AbstractCegarLoop]: Abstraction has 147227 states and 175574 transitions. [2021-11-19 04:56:58,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has 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) [2021-11-19 04:56:58,378 INFO L276 IsEmpty]: Start isEmpty. Operand 147227 states and 175574 transitions. [2021-11-19 04:56:58,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-19 04:56:58,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:56:58,380 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] [2021-11-19 04:56:58,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-19 04:56:58,381 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 04:56:58,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:56:58,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1572407842, now seen corresponding path program 1 times [2021-11-19 04:56:58,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:56:58,382 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211962406] [2021-11-19 04:56:58,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:58,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:56:58,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:58,488 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 04:56:58,488 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:58,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211962406] [2021-11-19 04:56:58,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211962406] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:56:58,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:56:58,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:56:58,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928769380] [2021-11-19 04:56:58,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:56:58,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 04:56:58,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:56:58,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 04:56:58,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:56:58,492 INFO L87 Difference]: Start difference. First operand 147227 states and 175574 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) [2021-11-19 04:57:00,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:57:00,925 INFO L93 Difference]: Finished difference Result 424126 states and 506087 transitions. [2021-11-19 04:57:00,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 04:57:00,926 INFO L78 Accepts]: Start accepts. Automaton has 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) Word has length 146 [2021-11-19 04:57:00,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:57:01,345 INFO L225 Difference]: With dead ends: 424126 [2021-11-19 04:57:01,345 INFO L226 Difference]: Without dead ends: 277022 [2021-11-19 04:57:01,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 04:57:01,422 INFO L933 BasicCegarLoop]: 486 mSDtfsCounter, 513 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 513 SdHoareTripleChecker+Valid, 916 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 04:57:01,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [513 Valid, 916 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 04:57:01,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277022 states.